Backport further refinements from the nullability efforts

Issue: SPR-15656

spring-beans/src/main/java/org/springframework/beans/AbstractNestablePropertyAccessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -55,10 +55,10 @@ import org.springframework.util.StringUtils;
  * as String arrays are converted in such a format if the array itself is not
  * assignable.
  *
- * @author Rod Johnson
  * @author Juergen Hoeller
- * @author Rob Harrop
  * @author Stephane Nicoll
+ * @author Rod Johnson
+ * @author Rob Harrop
  * @since 4.2
  * @see #registerCustomEditor
  * @see #setPropertyValues
@@ -96,9 +96,7 @@ public abstract class AbstractNestablePropertyAccessor extends AbstractPropertyA
 
 	Object rootObject;
 
-	/**
-	 * Map with cached nested Accessors: nested path -> Accessor instance.
-	 */
+	/** Map with cached nested Accessors: nested path -> Accessor instance */
 	private Map<String, AbstractNestablePropertyAccessor> nestedPropertyAccessors;
 
 

spring-beans/src/main/java/org/springframework/beans/factory/CannotLoadBeanClassException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -46,8 +46,8 @@ public class CannotLoadBeanClassException extends FatalBeanException {
 	public CannotLoadBeanClassException(
 			String resourceDescription, String beanName, String beanClassName, ClassNotFoundException cause) {
 
-		super("Cannot find class [" + beanClassName + "] for bean with name '" + beanName +
-				"' defined in " + resourceDescription, cause);
+		super("Cannot find class [" + String.valueOf(beanClassName) + "] for bean with name '" + beanName + "'" +
+				(resourceDescription != null ? " defined in " + resourceDescription : ""), cause);
 		this.resourceDescription = resourceDescription;
 		this.beanName = beanName;
 		this.beanClassName = beanClassName;
@@ -64,8 +64,9 @@ public class CannotLoadBeanClassException extends FatalBeanException {
 	public CannotLoadBeanClassException(
 			String resourceDescription, String beanName, String beanClassName, LinkageError cause) {
 
-		super("Error loading class [" + beanClassName + "] for bean with name '" + beanName +
-				"' defined in " + resourceDescription + ": problem with class file or dependent class", cause);
+		super("Error loading class [" + String.valueOf(beanClassName) + "] for bean with name '" + beanName + "'" +
+				(resourceDescription != null ? " defined in " + resourceDescription : "") +
+				": problem with class file or dependent class", cause);
 		this.resourceDescription = resourceDescription;
 		this.beanName = beanName;
 		this.beanClassName = beanClassName;

spring-beans/src/main/java/org/springframework/beans/factory/config/DependencyDescriptor.java

@@ -240,12 +240,14 @@ public class DependencyDescriptor extends InjectionPoint implements Serializable
 	 * @since 4.0
 	 */
 	public ResolvableType getResolvableType() {
-		if (this.resolvableType == null) {
-			this.resolvableType = (this.field != null ?
+		ResolvableType resolvableType = this.resolvableType;
+		if (resolvableType == null) {
+			resolvableType = (this.field != null ?
 					ResolvableType.forField(this.field, this.nestingLevel, this.containingClass) :
 					ResolvableType.forMethodParameter(this.methodParameter));
+			this.resolvableType = resolvableType;
 		}
-		return this.resolvableType;
+		return resolvableType;
 	}
 
 	/**

spring-beans/src/main/java/org/springframework/beans/factory/support/StaticListableBeanFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,6 +35,7 @@ import org.springframework.beans.factory.SmartFactoryBean;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.util.Assert;
+import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -134,12 +135,21 @@ public class StaticListableBeanFactory implements ListableBeanFactory {
 	@SuppressWarnings("unchecked")
 	public <T> T getBean(String name, Class<T> requiredType) throws BeansException {
 		Object bean = getBean(name);
-		if (requiredType != null && !requiredType.isAssignableFrom(bean.getClass())) {
+		if (requiredType != null && !requiredType.isInstance(bean)) {
 			throw new BeanNotOfRequiredTypeException(name, requiredType, bean.getClass());
 		}
 		return (T) bean;
 	}
 
+	@Override
+	public Object getBean(String name, Object... args) throws BeansException {
+		if (!ObjectUtils.isEmpty(args)) {
+			throw new UnsupportedOperationException(
+					"StaticListableBeanFactory does not support explicit bean creation arguments");
+		}
+		return getBean(name);
+	}
+
 	@Override
 	public <T> T getBean(Class<T> requiredType) throws BeansException {
 		String[] beanNames = getBeanNamesForType(requiredType);
@@ -154,18 +164,9 @@ public class StaticListableBeanFactory implements ListableBeanFactory {
 		}
 	}
 
-	@Override
-	public Object getBean(String name, Object... args) throws BeansException {
-		if (args != null) {
-			throw new UnsupportedOperationException(
-					"StaticListableBeanFactory does not support explicit bean creation arguments");
-		}
-		return getBean(name);
-	}
-
 	@Override
 	public <T> T getBean(Class<T> requiredType, Object... args) throws BeansException {
-		if (args != null) {
+		if (!ObjectUtils.isEmpty(args)) {
 			throw new UnsupportedOperationException(
 					"StaticListableBeanFactory does not support explicit bean creation arguments");
 		}
@@ -352,7 +353,8 @@ public class StaticListableBeanFactory implements ListableBeanFactory {
 	public <A extends Annotation> A findAnnotationOnBean(String beanName, Class<A> annotationType)
 			throws NoSuchBeanDefinitionException{
 
-		return AnnotationUtils.findAnnotation(getType(beanName), annotationType);
+		Class<?> beanType = getType(beanName);
+		return (beanType != null ? AnnotationUtils.findAnnotation(beanType, annotationType) : null);
 	}
 
 }

spring-beans/src/main/java/org/springframework/beans/factory/xml/AbstractBeanDefinitionParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -140,7 +140,7 @@ public abstract class AbstractBeanDefinitionParser implements BeanDefinitionPars
 	/**
 	 * Central template method to actually parse the supplied {@link Element}
 	 * into one or more {@link BeanDefinition BeanDefinitions}.
-	 * @param element	the element that is to be parsed into one or more {@link BeanDefinition BeanDefinitions}
+	 * @param element the element that is to be parsed into one or more {@link BeanDefinition BeanDefinitions}
 	 * @param parserContext the object encapsulating the current state of the parsing process;
 	 * provides access to a {@link org.springframework.beans.factory.support.BeanDefinitionRegistry}
 	 * @return the primary {@link BeanDefinition} resulting from the parsing of the supplied {@link Element}

spring-beans/src/main/java/org/springframework/beans/factory/xml/BeanDefinitionParserDelegate.java

@@ -389,8 +389,7 @@ public class BeanDefinitionParserDelegate {
 	}
 
 	/**
-	 * Return the defaults definition object, or {@code null} if the
-	 * defaults have been initialized yet.
+	 * Return the defaults definition object.
 	 */
 	public DocumentDefaultsDefinition getDefaults() {
 		return this.defaults;

spring-context/src/main/java/org/springframework/context/annotation/ConditionContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,43 +25,39 @@ import org.springframework.core.io.ResourceLoader;
  * Context information for use by {@link Condition}s.
  *
  * @author Phillip Webb
+ * @author Juergen Hoeller
  * @since 4.0
  */
 public interface ConditionContext {
 
 	/**
 	 * Return the {@link BeanDefinitionRegistry} that will hold the bean definition
-	 * should the condition match or {@code null} if the registry is not available.
-	 * @return the registry or {@code null}
+	 * should the condition match, or {@code null} if the registry is not available.
 	 */
 	BeanDefinitionRegistry getRegistry();
 
 	/**
 	 * Return the {@link ConfigurableListableBeanFactory} that will hold the bean
-	 * definition should the condition match or {@code null} if the bean factory
+	 * definition should the condition match, or {@code null} if the bean factory
 	 * is not available.
-	 * @return the bean factory or {@code null}
 	 */
 	ConfigurableListableBeanFactory getBeanFactory();
 
 	/**
-	 * Return the {@link Environment} for which the current application is running
+	 * Return the {@link Environment} for which the current application is running,
 	 * or {@code null} if no environment is available.
-	 * @return the environment or {@code null}
 	 */
 	Environment getEnvironment();
 
 	/**
-	 * Return the {@link ResourceLoader} currently being used or {@code null}
-	 * if the resource loader cannot be obtained.
-	 * @return a resource loader or {@code null}
+	 * Return the {@link ResourceLoader} currently being used, or {@code null} if
+	 * the resource loader cannot be obtained.
 	 */
 	ResourceLoader getResourceLoader();
 
 	/**
-	 * Return the {@link ClassLoader} that should be used to load additional
-	 * classes or {@code null} if the default classloader should be used.
-	 * @return the class loader or {@code null}
+	 * Return the {@link ClassLoader} that should be used to load additional classes,
+	 * or {@code null} if the default classloader should be used.
 	 */
 	ClassLoader getClassLoader();
 

spring-context/src/test/java/org/springframework/jmx/IJmxTestBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,19 +22,19 @@ package org.springframework.jmx;
  */
 public interface IJmxTestBean {
 
-	public int add(int x, int y);
+	int add(int x, int y);
 
-	public long myOperation();
+	long myOperation();
 
-	public int getAge();
+	int getAge();
 
-	public void setAge(int age);
+	void setAge(int age);
 
-	public void setName(String name) throws Exception;
+	void setName(String name) throws Exception;
 
-	public String getName();
+	String getName();
 
 	// used to test invalid methods that exist in the proxy interface
-	public void dontExposeMe();
+	void dontExposeMe();
 
 }

spring-core/src/main/java/org/springframework/util/ClassUtils.java

@@ -1030,7 +1030,7 @@ public abstract class ClassUtils {
 	 * in the given array.
 	 * <p>Basically like {@code AbstractCollection.toString()}, but stripping
 	 * the "class "/"interface " prefix before every class name.
-	 * @param classes a Collection of Class objects (may be {@code null})
+	 * @param classes an array of Class objects
 	 * @return a String of form "[com.foo.Bar, com.foo.Baz]"
 	 * @see java.util.AbstractCollection#toString()
 	 */
@@ -1231,6 +1231,7 @@ public abstract class ClassUtils {
 	/**
 	 * Check whether the given object is a CGLIB proxy.
 	 * @param object the object to check
+	 * @see #isCglibProxyClass(Class)
 	 * @see org.springframework.aop.support.AopUtils#isCglibProxy(Object)
 	 */
 	public static boolean isCglibProxy(Object object) {
@@ -1240,6 +1241,7 @@ public abstract class ClassUtils {
 	/**
 	 * Check whether the specified class is a CGLIB-generated class.
 	 * @param clazz the class to check
+	 * @see #isCglibProxyClassName(String)
 	 */
 	public static boolean isCglibProxyClass(Class<?> clazz) {
 		return (clazz != null && isCglibProxyClassName(clazz.getName()));

spring-core/src/main/java/org/springframework/util/ConcurrentReferenceHashMap.java

@@ -419,9 +419,8 @@ public class ConcurrentReferenceHashMap<K, V> extends AbstractMap<K, V> implemen
 		private final int initialSize;
 
 		/**
-		 * Array of references indexed using the low order bits from the hash. This
-		 * property should only be set via {@link #setReferences} to ensure that the
-		 * {@code resizeThreshold} is maintained.
+		 * Array of references indexed using the low order bits from the hash.
+		 * This property should only be set along with {@code resizeThreshold}.
 		 */
 		private volatile Reference<K, V>[] references;
 
@@ -617,14 +616,14 @@ public class ConcurrentReferenceHashMap<K, V> extends AbstractMap<K, V> implemen
 		}
 
 		/**
-		 * @return the size of the current references array
+		 * Return the size of the current references array.
 		 */
 		public final int getSize() {
 			return this.references.length;
 		}
 
 		/**
-		 * @return the total number of references in this segment
+		 * Return the total number of references in this segment.
 		 */
 		public final int getCount() {
 			return this.count;
@@ -639,21 +638,17 @@ public class ConcurrentReferenceHashMap<K, V> extends AbstractMap<K, V> implemen
 	protected interface Reference<K, V> {
 
 		/**
-		 * Returns the referenced entry or {@code null} if the entry is no longer
-		 * available.
-		 * @return the entry or {@code null}
+		 * Return the referenced entry, or {@code null} if the entry is no longer available.
 		 */
 		Entry<K, V> get();
 
 		/**
-		 * Returns the hash for the reference.
-		 * @return the hash
+		 * Return the hash for the reference.
 		 */
 		int getHash();
 
 		/**
-		 * Returns the next reference in the chain or {@code null}
-		 * @return the next reference of {@code null}
+		 * Return the next reference in the chain, or {@code null} if none.
 		 */
 		Reference<K, V> getNext();
 
@@ -930,7 +925,7 @@ public class ConcurrentReferenceHashMap<K, V> extends AbstractMap<K, V> implemen
 		 * Factory method used to create a new {@link Reference}.
 		 * @param entry the entry contained in the reference
 		 * @param hash the hash
-		 * @param next the next reference in the chain or {@code null}
+		 * @param next the next reference in the chain, or {@code null} if none
 		 * @return a new {@link Reference}
 		 */
 		public Reference<K, V> createReference(Entry<K, V> entry, int hash, Reference<K, V> next) {

spring-core/src/main/java/org/springframework/util/StringUtils.java

@@ -114,7 +114,7 @@ public abstract class StringUtils {
 	 * @see #hasText(String)
 	 */
 	public static boolean hasLength(String str) {
-		return hasLength((CharSequence) str);
+		return (str != null && !str.isEmpty());
 	}
 
 	/**
@@ -159,7 +159,7 @@ public abstract class StringUtils {
 	 * @see #hasText(CharSequence)
 	 */
 	public static boolean hasText(String str) {
-		return hasText((CharSequence) str);
+		return (str != null && !str.isEmpty() && hasText((CharSequence) str));
 	}
 
 	/**
@@ -376,8 +376,8 @@ public abstract class StringUtils {
 
 	/**
 	 * Count the occurrences of the substring {@code sub} in string {@code str}.
-	 * @param str string to search in. Return 0 if this is {@code null}.
-	 * @param sub string to search for. Return 0 if this is {@code null}.
+	 * @param str string to search in
+	 * @param sub string to search for
 	 */
 	public static int countOccurrencesOf(String str, String sub) {
 		if (!hasLength(str) || !hasLength(sub)) {
@@ -395,8 +395,7 @@ public abstract class StringUtils {
 	}
 
 	/**
-	 * Replace all occurrences of a substring within a string with
-	 * another string.
+	 * Replace all occurrences of a substring within a string with another string.
 	 * @param inString {@code String} to examine
 	 * @param oldPattern {@code String} to replace
 	 * @param newPattern {@code String} to insert
@@ -513,9 +512,8 @@ public abstract class StringUtils {
 	 * Capitalize a {@code String}, changing the first letter to
 	 * upper case as per {@link Character#toUpperCase(char)}.
 	 * No other letters are changed.
-	 * @param str the {@code String} to capitalize, may be {@code null}
-	 * @return the capitalized {@code String}, or {@code null} if the supplied
-	 * string is {@code null}
+	 * @param str the {@code String} to capitalize
+	 * @return the capitalized {@code String}
 	 */
 	public static String capitalize(String str) {
 		return changeFirstCharacterCase(str, true);
@@ -525,9 +523,8 @@ public abstract class StringUtils {
 	 * Uncapitalize a {@code String}, changing the first letter to
 	 * lower case as per {@link Character#toLowerCase(char)}.
 	 * No other letters are changed.
-	 * @param str the {@code String} to uncapitalize, may be {@code null}
-	 * @return the uncapitalized {@code String}, or {@code null} if the supplied
-	 * string is {@code null}
+	 * @param str the {@code String} to uncapitalize
+	 * @return the uncapitalized {@code String}
 	 */
 	public static String uncapitalize(String str) {
 		return changeFirstCharacterCase(str, false);
@@ -597,9 +594,8 @@ public abstract class StringUtils {
 	/**
 	 * Strip the filename extension from the given Java resource path,
 	 * e.g. "mypath/myfile.txt" -> "mypath/myfile".
-	 * @param path the file path (may be {@code null})
-	 * @return the path with stripped filename extension,
-	 * or {@code null} if none
+	 * @param path the file path
+	 * @return the path with stripped filename extension
 	 */
 	public static String stripFilenameExtension(String path) {
 		if (path == null) {
@@ -724,7 +720,7 @@ public abstract class StringUtils {
 	 * @param localeString the locale {@code String}, following {@code Locale's}
 	 * {@code toString()} format ("en", "en_UK", etc);
 	 * also accepts spaces as separators, as an alternative to underscores
-	 * @return a corresponding {@code Locale} instance
+	 * @return a corresponding {@code Locale} instance, or {@code null} if none
 	 * @throws IllegalArgumentException in case of an invalid locale specification
 	 */
 	public static Locale parseLocaleString(String localeString) {
@@ -877,8 +873,7 @@ public abstract class StringUtils {
 	 * Copy the given {@code Collection} into a {@code String} array.
 	 * <p>The {@code Collection} must contain {@code String} elements only.
 	 * @param collection the {@code Collection} to copy
-	 * @return the {@code String} array ({@code null} if the supplied
-	 * {@code Collection} was {@code null})
+	 * @return the {@code String} array
 	 */
 	public static String[] toStringArray(Collection<String> collection) {
 		if (collection == null) {
@@ -892,8 +887,7 @@ public abstract class StringUtils {
 	 * Copy the given Enumeration into a {@code String} array.
 	 * The Enumeration must contain {@code String} elements only.
 	 * @param enumeration the Enumeration to copy
-	 * @return the {@code String} array ({@code null} if the passed-in
-	 * Enumeration was {@code null})
+	 * @return the {@code String} array
 	 */
 	public static String[] toStringArray(Enumeration<String> enumeration) {
 		if (enumeration == null) {
@@ -1048,8 +1042,7 @@ public abstract class StringUtils {
 	 * @param ignoreEmptyTokens omit empty tokens from the result array
 	 * (only applies to tokens that are empty after trimming; StringTokenizer
 	 * will not consider subsequent delimiters as token in the first place).
-	 * @return an array of the tokens ({@code null} if the input {@code String}
-	 * was {@code null})
+	 * @return an array of the tokens
 	 * @see java.util.StringTokenizer
 	 * @see String#trim()
 	 * @see #delimitedListToStringArray

spring-jdbc/src/main/java/org/springframework/jdbc/core/BatchUpdateUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,20 +25,21 @@ import java.util.List;
  * within the framework.
  *
  * @author Thomas Risberg
+ * @since 3.0
  */
 public abstract class BatchUpdateUtils {
 
-	public static int[] executeBatchUpdate(String sql, final List<Object[]> batchValues, final int[] columnTypes, JdbcOperations jdbcOperations) {
+	public static int[] executeBatchUpdate(
+			String sql, final List<Object[]> batchValues, final int[] columnTypes, JdbcOperations jdbcOperations) {
+
 		return jdbcOperations.batchUpdate(
 				sql,
 				new BatchPreparedStatementSetter() {
-
 					@Override
 					public void setValues(PreparedStatement ps, int i) throws SQLException {
 						Object[] values = batchValues.get(i);
 						setStatementParameters(values, ps, columnTypes);
 					}
-
 					@Override
 					public int getBatchSize() {
 						return batchValues.size();
@@ -46,7 +47,9 @@ public abstract class BatchUpdateUtils {
 				});
 	}
 
-	protected static void setStatementParameters(Object[] values, PreparedStatement ps, int[] columnTypes) throws SQLException {
+	protected static void setStatementParameters(Object[] values, PreparedStatement ps, int[] columnTypes)
+			throws SQLException {
+
 		int colIndex = 0;
 		for (Object value : values) {
 			colIndex++;

spring-jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -1267,11 +1267,14 @@ public class JdbcTemplate extends JdbcAccessor implements JdbcOperations {
 	 * @param param the corresponding stored procedure parameter
 	 * @return Map that contains returned results
 	 */
-	@SuppressWarnings({ "unchecked", "rawtypes" })
-	protected Map<String, Object> processResultSet(ResultSet rs, ResultSetSupportingSqlParameter param) throws SQLException {
+	@SuppressWarnings({"unchecked", "rawtypes"})
+	protected Map<String, Object> processResultSet(ResultSet rs, ResultSetSupportingSqlParameter param)
+			throws SQLException {
+
 		if (rs == null) {
 			return Collections.emptyMap();
 		}
+
 		Map<String, Object> returnedResults = new HashMap<String, Object>();
 		try {
 			ResultSet rsToUse = rs;

spring-jdbc/src/main/java/org/springframework/jdbc/core/StatementCreatorUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -119,7 +119,7 @@ public abstract class StatementCreatorUtils {
 	/**
 	 * Derive a default SQL type from the given Java type.
 	 * @param javaType the Java type to translate
-	 * @return the corresponding SQL type, or {@code null} if none found
+	 * @return the corresponding SQL type, or {@link SqlTypeValue#TYPE_UNKNOWN} if none found
 	 */
 	public static int javaTypeToSqlParameterType(Class<?> javaType) {
 		Integer sqlType = javaTypeToSqlTypeMap.get(javaType);

spring-jdbc/src/main/java/org/springframework/jdbc/core/metadata/CallMetaDataContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -234,6 +234,14 @@ public class CallMetaDataContext {
 	}
 
 
+	/**
+	 * Initialize this class with metadata from the database.
+	 * @param dataSource the DataSource used to retrieve metadata
+	 */
+	public void initializeMetaData(DataSource dataSource) {
+		this.metaDataProvider = CallMetaDataProviderFactory.createMetaDataProvider(dataSource, this);
+	}
+
 	/**
 	 * Create a ReturnResultSetParameter/SqlOutParameter depending on the support provided
 	 * by the JDBC driver used for the database in use.
@@ -278,14 +286,6 @@ public class CallMetaDataContext {
 		return this.callParameters;
 	}
 
-	/**
-	 * Initialize this class with metadata from the database.
-	 * @param dataSource the DataSource used to retrieve metadata
-	 */
-	public void initializeMetaData(DataSource dataSource) {
-		this.metaDataProvider = CallMetaDataProviderFactory.createMetaDataProvider(dataSource, this);
-	}
-
 	/**
 	 * Process the list of parameters provided, and if procedure column metadata is used,
 	 * the parameters will be matched against the metadata information and any missing

spring-jdbc/src/main/java/org/springframework/jdbc/core/metadata/CallMetaDataProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -51,9 +51,8 @@ public interface CallMetaDataProvider {
 	 * @throws SQLException in case of initialization failure
 	 * @see	org.springframework.jdbc.core.simple.SimpleJdbcCall#withoutProcedureColumnMetaDataAccess()
 	 */
-	void initializeWithProcedureColumnMetaData(
-			DatabaseMetaData databaseMetaData, String catalogName, String schemaName, String procedureName)
-			throws SQLException;
+	void initializeWithProcedureColumnMetaData(DatabaseMetaData databaseMetaData, String catalogName,
+			String schemaName, String procedureName) throws SQLException;
 
 	/**
 	 * Provide any modification of the procedure name passed in to match the meta data currently used.

spring-jdbc/src/main/java/org/springframework/jdbc/core/metadata/DerbyTableMetaDataProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2007 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,8 +21,8 @@ import java.sql.SQLException;
 
 /**
  * The Derby specific implementation of the {@link org.springframework.jdbc.core.metadata.TableMetaDataProvider}.
- * Overrides the Derby metadata info regarding retreiving generated keys. It seems to work OK so not sure why they
- * claim it's not supported.
+ * Overrides the Derby metadata info regarding retrieving generated keys. It seems to work OK so not sure why
+ * they claim it's not supported.
  *
  * @author Thomas Risberg
  * @since 3.0
@@ -31,26 +31,26 @@ public class DerbyTableMetaDataProvider extends GenericTableMetaDataProvider {
 
 	private boolean supportsGeneratedKeysOverride = false;
 
+
 	public DerbyTableMetaDataProvider(DatabaseMetaData databaseMetaData) throws SQLException {
 		super(databaseMetaData);
 	}
 
+
 	@Override
 	public void initializeWithMetaData(DatabaseMetaData databaseMetaData) throws SQLException {
 		super.initializeWithMetaData(databaseMetaData);
 		if (!databaseMetaData.supportsGetGeneratedKeys()) {
-			logger.warn("Overriding supportsGetGeneratedKeys from DatabaseMetaData to 'true'; it was reported as " +
-					"'false' by " + databaseMetaData.getDriverName() + " " + databaseMetaData.getDriverVersion());
-			supportsGeneratedKeysOverride = true;
+			if (logger.isWarnEnabled()) {
+				logger.warn("Overriding supportsGetGeneratedKeys from DatabaseMetaData to 'true'; it was reported as " +
+						"'false' by " + databaseMetaData.getDriverName() + " " + databaseMetaData.getDriverVersion());
+			}
+			this.supportsGeneratedKeysOverride = true;
 		}
 	}
 
 	@Override
 	public boolean isGetGeneratedKeysSupported() {
-		boolean derbysAnswer = super.isGetGeneratedKeysSupported();
-		if (!derbysAnswer) {
-			return supportsGeneratedKeysOverride;
-		}
-		return derbysAnswer;
+		return (super.isGetGeneratedKeysSupported() || this.supportsGeneratedKeysOverride);
 	}
 }

spring-jdbc/src/main/java/org/springframework/jdbc/core/metadata/OracleCallMetaDataProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,7 +25,7 @@ import org.springframework.jdbc.core.SqlOutParameter;
 import org.springframework.jdbc.core.SqlParameter;
 
 /**
- * Oracle specific implementation for the {@link CallMetaDataProvider} interface.
+ * Oracle-specific implementation for the {@link CallMetaDataProvider} interface.
  * This class is intended for internal use by the Simple JDBC classes.
  *
  * @author Thomas Risberg
@@ -59,13 +59,13 @@ public class OracleCallMetaDataProvider extends GenericCallMetaDataProvider {
 	@Override
 	public String metaDataCatalogNameToUse(String catalogName) {
 		// Oracle uses catalog name for package name or an empty string if no package
-		return catalogName == null ? "" : catalogNameToUse(catalogName);
+		return (catalogName == null ? "" : catalogNameToUse(catalogName));
 	}
 
 	@Override
 	public String metaDataSchemaNameToUse(String schemaName) {
 		// Use current user schema if no schema specified
-		return schemaName == null ? getUserName() : super.metaDataSchemaNameToUse(schemaName);
+		return (schemaName == null ? getUserName() : super.metaDataSchemaNameToUse(schemaName));
 	}
 
 	@Override

spring-jdbc/src/main/java/org/springframework/jdbc/core/metadata/PostgresCallMetaDataProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,7 +25,7 @@ import org.springframework.jdbc.core.SqlOutParameter;
 import org.springframework.jdbc.core.SqlParameter;
 
 /**
- * Oracle specific implementation for the {@link org.springframework.jdbc.core.metadata.CallMetaDataProvider} interface.
+ * Postgres-specific implementation for the {@link CallMetaDataProvider} interface.
  * This class is intended for internal use by the Simple JDBC classes.
  *
  * @author Thomas Risberg
@@ -59,7 +59,7 @@ public class PostgresCallMetaDataProvider extends GenericCallMetaDataProvider {
 	@Override
 	public String metaDataSchemaNameToUse(String schemaName) {
 		// Use public schema if no schema specified
-		return schemaName == null ? "public" : super.metaDataSchemaNameToUse(schemaName);
+		return (schemaName == null ? "public" : super.metaDataSchemaNameToUse(schemaName));
 	}
 
 	@Override
@@ -74,7 +74,7 @@ public class PostgresCallMetaDataProvider extends GenericCallMetaDataProvider {
 
 	@Override
 	public boolean byPassReturnParameter(String parameterName) {
-		return (RETURN_VALUE_NAME.equals(parameterName) ||
-				super.byPassReturnParameter(parameterName));
+		return RETURN_VALUE_NAME.equals(parameterName);
 	}
+
 }

spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/SqlParameterSourceUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -90,8 +90,7 @@ public class SqlParameterSourceUtils {
 		Map<String, String> caseInsensitiveParameterNames = new HashMap<String, String>();
 		if (parameterSource instanceof BeanPropertySqlParameterSource) {
 			String[] propertyNames = ((BeanPropertySqlParameterSource)parameterSource).getReadablePropertyNames();
-			for (int i = 0; i < propertyNames.length; i++) {
-				String name = propertyNames[i];
+			for (String name : propertyNames) {
 				caseInsensitiveParameterNames.put(name.toLowerCase(), name);
 			}
 		}

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/DataSourceTransactionManager.java

@@ -229,7 +229,7 @@ public class DataSourceTransactionManager extends AbstractPlatformTransactionMan
 	@Override
 	protected boolean isExistingTransaction(Object transaction) {
 		DataSourceTransactionObject txObject = (DataSourceTransactionObject) transaction;
-		return (txObject.getConnectionHolder() != null && txObject.getConnectionHolder().isTransactionActive());
+		return (txObject.hasConnectionHolder() && txObject.getConnectionHolder().isTransactionActive());
 	}
 
 	/**
@@ -241,7 +241,7 @@ public class DataSourceTransactionManager extends AbstractPlatformTransactionMan
 		Connection con = null;
 
 		try {
-			if (txObject.getConnectionHolder() == null ||
+			if (!txObject.hasConnectionHolder() ||
 					txObject.getConnectionHolder().isSynchronizedWithTransaction()) {
 				Connection newCon = this.dataSource.getConnection();
 				if (logger.isDebugEnabled()) {

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/DataSourceUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -268,8 +268,10 @@ public abstract class DataSourceUtils {
 	 */
 	public static void applyTimeout(Statement stmt, DataSource dataSource, int timeout) throws SQLException {
 		Assert.notNull(stmt, "No Statement specified");
-		Assert.notNull(dataSource, "No DataSource specified");
-		ConnectionHolder holder = (ConnectionHolder) TransactionSynchronizationManager.getResource(dataSource);
+		ConnectionHolder holder = null;
+		if (dataSource != null) {
+			holder = (ConnectionHolder) TransactionSynchronizationManager.getResource(dataSource);
+		}
 		if (holder != null && holder.hasTimeout()) {
 			// Remaining transaction timeout overrides specified value.
 			stmt.setQueryTimeout(holder.getTimeToLiveInSeconds());

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/init/DataSourceInitializer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -54,10 +54,8 @@ public class DataSourceInitializer implements InitializingBean, DisposableBean {
 	}
 
 	/**
-	 * Set the {@link DatabasePopulator} to execute during the bean initialization
-	 * phase.
-	 * @param databasePopulator the {@code DatabasePopulator} to use during
-	 * initialization
+	 * Set the {@link DatabasePopulator} to execute during the bean initialization phase.
+	 * @param databasePopulator the {@code DatabasePopulator} to use during initialization
 	 * @see #setDatabaseCleaner
 	 */
 	public void setDatabasePopulator(DatabasePopulator databasePopulator) {
@@ -84,6 +82,7 @@ public class DataSourceInitializer implements InitializingBean, DisposableBean {
 		this.enabled = enabled;
 	}
 
+
 	/**
 	 * Use the {@linkplain #setDatabasePopulator database populator} to set up
 	 * the database.
@@ -103,7 +102,7 @@ public class DataSourceInitializer implements InitializingBean, DisposableBean {
 	}
 
 	private void execute(DatabasePopulator populator) {
-		Assert.state(dataSource != null, "DataSource must be set");
+		Assert.state(this.dataSource != null, "DataSource must be set");
 		if (this.enabled && populator != null) {
 			DatabasePopulatorUtils.execute(populator, this.dataSource);
 		}

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/init/DatabasePopulatorUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -48,9 +48,7 @@ public abstract class DatabasePopulatorUtils {
 				populator.populate(connection);
 			}
 			finally {
-				if (connection != null) {
-					DataSourceUtils.releaseConnection(connection, dataSource);
-				}
+				DataSourceUtils.releaseConnection(connection, dataSource);
 			}
 		}
 		catch (Throwable ex) {

spring-jdbc/src/main/java/org/springframework/jdbc/object/RdbmsOperation.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,6 +32,7 @@ import org.springframework.beans.factory.InitializingBean;
 import org.springframework.dao.InvalidDataAccessApiUsageException;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.jdbc.core.SqlParameter;
+import org.springframework.util.Assert;
 
 /**
  * An "RDBMS operation" is a multi-threaded, reusable object representing a query,
@@ -85,27 +86,25 @@ public abstract class RdbmsOperation implements InitializingBean {
 
 
 	/**
-	 * An alternative to the more commonly used setDataSource() when you want to
-	 * use the same JdbcTemplate in multiple RdbmsOperations. This is appropriate if the
-	 * JdbcTemplate has special configuration such as a SQLExceptionTranslator that should
-	 * apply to multiple RdbmsOperation objects.
+	 * An alternative to the more commonly used {@link #setDataSource} when you want to
+	 * use the same {@link JdbcTemplate} in multiple {@code RdbmsOperations}. This is
+	 * appropriate if the {@code JdbcTemplate} has special configuration such as a
+	 * {@link org.springframework.jdbc.support.SQLExceptionTranslator} to be reused.
 	 */
 	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
-		if (jdbcTemplate == null) {
-			throw new IllegalArgumentException("jdbcTemplate must not be null");
-		}
+		Assert.notNull(jdbcTemplate, "JdbcTemplate must not be null");
 		this.jdbcTemplate = jdbcTemplate;
 	}
 
 	/**
-	 * Return the JdbcTemplate object used by this object.
+	 * Return the {@link JdbcTemplate} used by this operation object.
 	 */
 	public JdbcTemplate getJdbcTemplate() {
 		return this.jdbcTemplate;
 	}
 
 	/**
-	 * Set the JDBC DataSource to obtain connections from.
+	 * Set the JDBC {@link DataSource} to obtain connections from.
 	 * @see org.springframework.jdbc.core.JdbcTemplate#setDataSource
 	 */
 	public void setDataSource(DataSource dataSource) {
@@ -233,9 +232,8 @@ public abstract class RdbmsOperation implements InitializingBean {
 	}
 
 	/**
-	 * Subclasses can override this to supply dynamic SQL if they wish,
-	 * but SQL is normally set by calling the setSql() method
-	 * or in a subclass constructor.
+	 * Subclasses can override this to supply dynamic SQL if they wish, but SQL is
+	 * normally set by calling the {@link #setSql} method or in a subclass constructor.
 	 */
 	public String getSql() {
 		return this.sql;
@@ -287,7 +285,7 @@ public abstract class RdbmsOperation implements InitializingBean {
 	 * @param parameters Array containing the declared {@link SqlParameter} objects
 	 * @see #declaredParameters
 	 */
-	public void setParameters(SqlParameter[] parameters) {
+	public void setParameters(SqlParameter... parameters) {
 		if (isCompiled()) {
 			throw new InvalidDataAccessApiUsageException("Cannot add parameters once the query is compiled");
 		}
@@ -396,7 +394,7 @@ public abstract class RdbmsOperation implements InitializingBean {
 	 * Validate the named parameters passed to an execute method based on declared parameters.
 	 * Subclasses should invoke this method before every {@code executeQuery()} or
 	 * {@code update()} method.
-	 * @param parameters parameter Map supplied. May be {@code null}.
+	 * @param parameters parameter Map supplied (may be {@code null})
 	 * @throws InvalidDataAccessApiUsageException if the parameters are invalid
 	 */
 	protected void validateNamedParameters(Map<String, ?> parameters) throws InvalidDataAccessApiUsageException {

spring-jdbc/src/main/java/org/springframework/jdbc/support/AbstractFallbackSQLExceptionTranslator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -70,16 +70,22 @@ public abstract class AbstractFallbackSQLExceptionTranslator implements SQLExcep
 			sql = "";
 		}
 
-		DataAccessException dex = doTranslate(task, sql, ex);
-		if (dex != null) {
+		DataAccessException dae = doTranslate(task, sql, ex);
+		if (dae != null) {
 			// Specific exception match found.
-			return dex;
+			return dae;
 		}
+
 		// Looking for a fallback...
 		SQLExceptionTranslator fallback = getFallbackTranslator();
 		if (fallback != null) {
-			return fallback.translate(task, sql, ex);
+			dae = fallback.translate(task, sql, ex);
+			if (dae != null) {
+				// Fallback exception match found.
+				return dae;
+			}
 		}
+
 		// We couldn't identify it more precisely.
 		return new UncategorizedSQLException(task, sql, ex);
 	}
@@ -90,7 +96,7 @@ public abstract class AbstractFallbackSQLExceptionTranslator implements SQLExcep
 	 * is allowed to return {@code null} to indicate that no exception match has
 	 * been found and that fallback translation should kick in.
 	 * @param task readable text describing the task being attempted
-	 * @param sql SQL query or update that caused the problem (may be {@code null})
+	 * @param sql SQL query or update that caused the problem (if known)
 	 * @param ex the offending {@code SQLException}
 	 * @return the DataAccessException, wrapping the {@code SQLException};
 	 * or {@code null} if no exception match found
@@ -103,7 +109,7 @@ public abstract class AbstractFallbackSQLExceptionTranslator implements SQLExcep
 	 * <p>To be called by translator subclasses when creating an instance of a generic
 	 * {@link org.springframework.dao.DataAccessException} class.
 	 * @param task readable text describing the task being attempted
-	 * @param sql the SQL statement that caused the problem (may be {@code null})
+	 * @param sql the SQL statement that caused the problem
 	 * @param ex the offending {@code SQLException}
 	 * @return the message {@code String} to use
 	 */

spring-jdbc/src/main/java/org/springframework/jdbc/support/JdbcUtils.java

@@ -472,8 +472,8 @@ public abstract class JdbcUtils {
 	}
 
 	/**
-	 * Convert a column name with underscores to the corresponding property name using "camel case".  A name
-	 * like "customer_number" would match a "customerNumber" property name.
+	 * Convert a column name with underscores to the corresponding property name using "camel case".
+	 * A name like "customer_number" would match a "customerNumber" property name.
 	 * @param name the column name to be converted
 	 * @return the name using "camel case"
 	 */

spring-jdbc/src/main/java/org/springframework/jdbc/support/SQLErrorCodesFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -216,9 +216,9 @@ public class SQLErrorCodesFactory {
 					}
 					catch (MetaDataAccessException ex) {
 						logger.warn("Error while extracting database name - falling back to empty error codes", ex);
-						// Fallback is to return an empty SQLErrorCodes instance.
-						return new SQLErrorCodes();
 					}
+					// Fallback is to return an empty SQLErrorCodes instance.
+					return new SQLErrorCodes();
 				}
 			}
 		}

spring-jdbc/src/main/java/org/springframework/jdbc/support/lob/TemporaryLobCreator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -59,11 +59,15 @@ public class TemporaryLobCreator implements LobCreator {
 	public void setBlobAsBytes(PreparedStatement ps, int paramIndex, byte[] content)
 			throws SQLException {
 
-		Blob blob = ps.getConnection().createBlob();
-		blob.setBytes(1, content);
-
-		this.temporaryBlobs.add(blob);
-		ps.setBlob(paramIndex, blob);
+		if (content != null) {
+			Blob blob = ps.getConnection().createBlob();
+			blob.setBytes(1, content);
+			this.temporaryBlobs.add(blob);
+			ps.setBlob(paramIndex, blob);
+		}
+		else {
+			ps.setBlob(paramIndex, (Blob) null);
+		}
 
 		if (logger.isDebugEnabled()) {
 			logger.debug(content != null ? "Copied bytes into temporary BLOB with length " + content.length :
@@ -76,17 +80,21 @@ public class TemporaryLobCreator implements LobCreator {
 			PreparedStatement ps, int paramIndex, InputStream binaryStream, int contentLength)
 			throws SQLException {
 
-		Blob blob = ps.getConnection().createBlob();
-		try {
-			FileCopyUtils.copy(binaryStream, blob.setBinaryStream(1));
+		if (binaryStream != null) {
+			Blob blob = ps.getConnection().createBlob();
+			try {
+				FileCopyUtils.copy(binaryStream, blob.setBinaryStream(1));
+			}
+			catch (IOException ex) {
+				throw new DataAccessResourceFailureException("Could not copy into LOB stream", ex);
+			}
+			this.temporaryBlobs.add(blob);
+			ps.setBlob(paramIndex, blob);
 		}
-		catch (IOException ex) {
-			throw new DataAccessResourceFailureException("Could not copy into LOB stream", ex);
+		else {
+			ps.setBlob(paramIndex, (Blob) null);
 		}
 
-		this.temporaryBlobs.add(blob);
-		ps.setBlob(paramIndex, blob);
-
 		if (logger.isDebugEnabled()) {
 			logger.debug(binaryStream != null ?
 					"Copied binary stream into temporary BLOB with length " + contentLength :
@@ -98,11 +106,15 @@ public class TemporaryLobCreator implements LobCreator {
 	public void setClobAsString(PreparedStatement ps, int paramIndex, String content)
 			throws SQLException {
 
-		Clob clob = ps.getConnection().createClob();
-		clob.setString(1, content);
-
-		this.temporaryClobs.add(clob);
-		ps.setClob(paramIndex, clob);
+		if (content != null) {
+			Clob clob = ps.getConnection().createClob();
+			clob.setString(1, content);
+			this.temporaryClobs.add(clob);
+			ps.setClob(paramIndex, clob);
+		}
+		else {
+			ps.setClob(paramIndex, (Clob) null);
+		}
 
 		if (logger.isDebugEnabled()) {
 			logger.debug(content != null ? "Copied string into temporary CLOB with length " + content.length() :
@@ -115,17 +127,21 @@ public class TemporaryLobCreator implements LobCreator {
 			PreparedStatement ps, int paramIndex, InputStream asciiStream, int contentLength)
 			throws SQLException {
 
-		Clob clob = ps.getConnection().createClob();
-		try {
-			FileCopyUtils.copy(asciiStream, clob.setAsciiStream(1));
+		if (asciiStream != null) {
+			Clob clob = ps.getConnection().createClob();
+			try {
+				FileCopyUtils.copy(asciiStream, clob.setAsciiStream(1));
+			}
+			catch (IOException ex) {
+				throw new DataAccessResourceFailureException("Could not copy into LOB stream", ex);
+			}
+			this.temporaryClobs.add(clob);
+			ps.setClob(paramIndex, clob);
 		}
-		catch (IOException ex) {
-			throw new DataAccessResourceFailureException("Could not copy into LOB stream", ex);
+		else {
+			ps.setClob(paramIndex, (Clob) null);
 		}
 
-		this.temporaryClobs.add(clob);
-		ps.setClob(paramIndex, clob);
-
 		if (logger.isDebugEnabled()) {
 			logger.debug(asciiStream != null ?
 					"Copied ASCII stream into temporary CLOB with length " + contentLength :
@@ -138,17 +154,21 @@ public class TemporaryLobCreator implements LobCreator {
 			PreparedStatement ps, int paramIndex, Reader characterStream, int contentLength)
 			throws SQLException {
 
-		Clob clob = ps.getConnection().createClob();
-		try {
-			FileCopyUtils.copy(characterStream, clob.setCharacterStream(1));
+		if (characterStream != null) {
+			Clob clob = ps.getConnection().createClob();
+			try {
+				FileCopyUtils.copy(characterStream, clob.setCharacterStream(1));
+			}
+			catch (IOException ex) {
+				throw new DataAccessResourceFailureException("Could not copy into LOB stream", ex);
+			}
+			this.temporaryClobs.add(clob);
+			ps.setClob(paramIndex, clob);
 		}
-		catch (IOException ex) {
-			throw new DataAccessResourceFailureException("Could not copy into LOB stream", ex);
+		else {
+			ps.setClob(paramIndex, (Clob) null);
 		}
 
-		this.temporaryClobs.add(clob);
-		ps.setClob(paramIndex, clob);
-
 		if (logger.isDebugEnabled()) {
 			logger.debug(characterStream != null ?
 					"Copied character stream into temporary CLOB with length " + contentLength :
@@ -170,4 +190,5 @@ public class TemporaryLobCreator implements LobCreator {
 			logger.error("Could not free LOB", ex);
 		}
 	}
+
 }

spring-jms/src/main/java/org/springframework/jms/config/AbstractListenerContainerParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -151,15 +151,14 @@ abstract class AbstractListenerContainerParser implements BeanDefinitionParser {
 			listenerDef.getPropertyValues().add("delegate", new RuntimeBeanReference(ref));
 		}
 
-		String method = null;
 		if (listenerEle.hasAttribute(METHOD_ATTRIBUTE)) {
-			method = listenerEle.getAttribute(METHOD_ATTRIBUTE);
+			String method = listenerEle.getAttribute(METHOD_ATTRIBUTE);
 			if (!StringUtils.hasText(method)) {
 				parserContext.getReaderContext().error(
 						"Listener 'method' attribute contains empty value.", listenerEle);
 			}
+			listenerDef.getPropertyValues().add("defaultListenerMethod", method);
 		}
-		listenerDef.getPropertyValues().add("defaultListenerMethod", method);
 
 		PropertyValue messageConverterPv = commonContainerProperties.getPropertyValue("messageConverter");
 		if (messageConverterPv != null) {

spring-jms/src/main/java/org/springframework/jms/connection/JmsResourceHolder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -170,10 +170,7 @@ public class JmsResourceHolder extends ResourceHolderSupport {
 	}
 
 	public Session getSession(Class<? extends Session> sessionType, Connection connection) {
-		List<Session> sessions = this.sessions;
-		if (connection != null) {
-			sessions = this.sessionsPerConnection.get(connection);
-		}
+		List<Session> sessions = (connection != null ? this.sessionsPerConnection.get(connection) : this.sessions);
 		return CollectionUtils.findValueOfType(sessions, sessionType);
 	}
 

spring-jms/src/main/java/org/springframework/jms/connection/JmsTransactionManager.java

@@ -170,7 +170,7 @@ public class JmsTransactionManager extends AbstractPlatformTransactionManager
 	@Override
 	protected boolean isExistingTransaction(Object transaction) {
 		JmsTransactionObject txObject = (JmsTransactionObject) transaction;
-		return (txObject.getResourceHolder() != null);
+		return txObject.hasResourceHolder();
 	}
 
 	@Override
@@ -316,6 +316,10 @@ public class JmsTransactionManager extends AbstractPlatformTransactionManager
 			return this.resourceHolder;
 		}
 
+		public boolean hasResourceHolder() {
+			return (this.resourceHolder != null);
+		}
+
 		@Override
 		public boolean isRollbackOnly() {
 			return this.resourceHolder.isRollbackOnly();

spring-jms/src/main/java/org/springframework/jms/listener/AbstractMessageListenerContainer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -197,7 +197,6 @@ public abstract class AbstractMessageListenerContainer extends AbstractJmsListen
 	 * @see #setDestinationName(String)
 	 */
 	public void setDestination(Destination destination) {
-		Assert.notNull(destination, "'destination' must not be null");
 		this.destination = destination;
 		if (destination instanceof Topic && !(destination instanceof Queue)) {
 			// Clearly a Topic: let's set the "pubSubDomain" flag accordingly.
@@ -223,11 +222,9 @@ public abstract class AbstractMessageListenerContainer extends AbstractJmsListen
 	 * container picking up the new destination immediately (works e.g. with
 	 * DefaultMessageListenerContainer, as long as the cache level is less than
 	 * CACHE_CONSUMER). However, this is considered advanced usage; use it with care!
-	 * @param destinationName the desired destination (can be {@code null})
 	 * @see #setDestination(javax.jms.Destination)
 	 */
 	public void setDestinationName(String destinationName) {
-		Assert.notNull(destinationName, "'destinationName' must not be null");
 		this.destination = destinationName;
 	}
 
@@ -246,7 +243,8 @@ public abstract class AbstractMessageListenerContainer extends AbstractJmsListen
 	 * (never {@code null}).
 	 */
 	protected String getDestinationDescription() {
-		return this.destination.toString();
+		Object destination = this.destination;
+		return (destination != null ? destination.toString() : "");
 	}
 
 	/**
@@ -432,7 +430,7 @@ public abstract class AbstractMessageListenerContainer extends AbstractJmsListen
 	 */
 	public void setDurableSubscriptionName(String durableSubscriptionName) {
 		this.subscriptionName = durableSubscriptionName;
-		this.subscriptionDurable = true;
+		this.subscriptionDurable = (durableSubscriptionName != null);
 	}
 
 	/**

spring-jms/src/main/java/org/springframework/jms/listener/adapter/AbstractAdaptableMessageListener.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -191,6 +191,9 @@ public abstract class AbstractAdaptableMessageListener
 		}
 	}
 
+	@Override
+	public abstract void onMessage(Message message, Session session) throws JMSException;
+
 	/**
 	 * Handle the given exception that arose during listener execution.
 	 * The default implementation logs the exception at error level.
@@ -204,6 +207,7 @@ public abstract class AbstractAdaptableMessageListener
 		logger.error("Listener execution failed", ex);
 	}
 
+
 	/**
 	 * Extract the message body from the given JMS message.
 	 * @param message the JMS {@code Message}
@@ -453,6 +457,7 @@ public abstract class AbstractAdaptableMessageListener
 		@Override
 		protected Message createMessageForPayload(Object payload, Session session, Object conversionHint)
 				throws JMSException {
+
 			MessageConverter converter = getMessageConverter();
 			if (converter == null) {
 				throw new IllegalStateException("No message converter, cannot handle '" + payload + "'");
@@ -464,6 +469,7 @@ public abstract class AbstractAdaptableMessageListener
 			return converter.toMessage(payload, session);
 		}
 
+
 		protected class LazyResolutionMessage implements org.springframework.messaging.Message<Object> {
 
 			private final javax.jms.Message message;
@@ -487,7 +493,6 @@ public abstract class AbstractAdaptableMessageListener
 								"Failed to extract payload from [" + this.message + "]", ex);
 					}
 				}
-				//
 				return this.payload;
 			}
 
@@ -513,7 +518,6 @@ public abstract class AbstractAdaptableMessageListener
 				return this.headers;
 			}
 		}
-
 	}
 
 

spring-jms/src/main/java/org/springframework/jms/listener/endpoint/StandardJmsActivationSpecFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -94,7 +94,7 @@ public class StandardJmsActivationSpecFactory implements JmsActivationSpecFactor
 	 * Return the {@link DestinationResolver} to use for resolving destinations names.
 	 */
 	public DestinationResolver getDestinationResolver() {
-		return destinationResolver;
+		return this.destinationResolver;
 	}
 
 	@Override

spring-messaging/src/test/java/org/springframework/messaging/simp/stomp/StompClientSupportTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -13,29 +13,25 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.messaging.simp.stomp;
 
-import org.junit.Before;
 import org.junit.Test;
 
 import static org.junit.Assert.*;
 
 /**
- * Unit tests for {@@link StompClientSupport}.
+ * Unit tests for {@link StompClientSupport}.
+ *
  * @author Rossen Stoyanchev
  */
 public class StompClientSupportTests {
 
-	private StompClientSupport stompClient;
+	private final StompClientSupport stompClient = new StompClientSupport() {};
 
 
-	@Before
-	public void setUp() throws Exception {
-		this.stompClient = new StompClientSupport() {};
-	}
-
 	@Test
-	public void defaultHearbeatValidation() throws Exception {
+	public void defaultHeartbeatValidation() throws Exception {
 		trySetDefaultHeartbeat(null);
 		trySetDefaultHeartbeat(new long[] {-1, 0});
 		trySetDefaultHeartbeat(new long[] {0, -1});

spring-orm/src/main/java/org/springframework/orm/ObjectOptimisticLockingFailureException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -149,7 +149,7 @@ public class ObjectOptimisticLockingFailureException extends OptimisticLockingFa
 	 * Return the identifier of the object for which the locking failed.
 	 */
 	public Object getIdentifier() {
-		return identifier;
+		return this.identifier;
 	}
 
 }

spring-orm/src/main/java/org/springframework/orm/ObjectRetrievalFailureException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -123,7 +123,7 @@ public class ObjectRetrievalFailureException extends DataRetrievalFailureExcepti
 	 * Return the identifier of the object that was not found.
 	 */
 	public Object getIdentifier() {
-		return identifier;
+		return this.identifier;
 	}
 
 }

spring-oxm/src/main/java/org/springframework/oxm/jaxb/Jaxb2Marshaller.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -196,7 +196,6 @@ public class Jaxb2Marshaller implements MimeMarshaller, MimeUnmarshaller, Generi
 	 * or {@link #setPackagesToScan "packagesToScan"} is required.
 	 */
 	public void setContextPath(String contextPath) {
-		Assert.hasText(contextPath, "'contextPath' must not be null");
 		this.contextPath = contextPath;
 	}
 
@@ -213,7 +212,6 @@ public class Jaxb2Marshaller implements MimeMarshaller, MimeUnmarshaller, Generi
 	 * or {@link #setPackagesToScan "packagesToScan"} is required.
 	 */
 	public void setClassesToBeBound(Class<?>... classesToBeBound) {
-		Assert.notEmpty(classesToBeBound, "'classesToBeBound' must not be empty");
 		this.classesToBeBound = classesToBeBound;
 	}
 

spring-tx/src/main/java/org/springframework/jca/cci/connection/CciLocalTransactionManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,14 +40,14 @@ import org.springframework.transaction.support.TransactionSynchronizationManager
  *
  * <p>Application code is required to retrieve the CCI Connection via
  * {@link ConnectionFactoryUtils#getConnection(ConnectionFactory)} instead of a standard
- * J2EE-style {@link ConnectionFactory#getConnection()} call. Spring classes such as
+ * Java EE-style {@link ConnectionFactory#getConnection()} call. Spring classes such as
  * {@link org.springframework.jca.cci.core.CciTemplate} use this strategy implicitly.
  * If not used in combination with this transaction manager, the
  * {@link ConnectionFactoryUtils} lookup strategy behaves exactly like the native
  * DataSource lookup; it can thus be used in a portable fashion.
  *
  * <p>Alternatively, you can allow application code to work with the standard
- * J2EE lookup pattern {@link ConnectionFactory#getConnection()}, for example
+ * Java EE lookup pattern {@link ConnectionFactory#getConnection()}, for example
  * for legacy code that is not aware of Spring at all. In that case, define a
  * {@link TransactionAwareConnectionFactoryProxy} for your target ConnectionFactory,
  * which will automatically participate in Spring-managed transactions.
@@ -135,7 +135,7 @@ public class CciLocalTransactionManager extends AbstractPlatformTransactionManag
 	protected boolean isExistingTransaction(Object transaction) {
 		CciLocalTransactionObject txObject = (CciLocalTransactionObject) transaction;
 		// Consider a pre-bound connection as transaction.
-		return (txObject.getConnectionHolder() != null);
+		return txObject.hasConnectionHolder();
 	}
 
 	@Override
@@ -269,6 +269,10 @@ public class CciLocalTransactionManager extends AbstractPlatformTransactionManag
 		public ConnectionHolder getConnectionHolder() {
 			return this.connectionHolder;
 		}
+
+		public boolean hasConnectionHolder() {
+			return (this.connectionHolder != null);
+		}
 	}
 
 }

spring-tx/src/main/java/org/springframework/jca/cci/connection/ConnectionSpecConnectionFactoryAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,9 +18,11 @@ package org.springframework.jca.cci.connection;
 
 import javax.resource.ResourceException;
 import javax.resource.cci.Connection;
+import javax.resource.cci.ConnectionFactory;
 import javax.resource.cci.ConnectionSpec;
 
 import org.springframework.core.NamedThreadLocal;
+import org.springframework.util.Assert;
 
 /**
  * An adapter for a target CCI {@link javax.resource.cci.ConnectionFactory},
@@ -129,15 +131,9 @@ public class ConnectionSpecConnectionFactoryAdapter extends DelegatingConnection
 	 * @see javax.resource.cci.ConnectionFactory#getConnection()
 	 */
 	protected Connection doGetConnection(ConnectionSpec spec) throws ResourceException {
-		if (getTargetConnectionFactory() == null) {
-			throw new IllegalStateException("targetConnectionFactory is required");
-		}
-		if (spec != null) {
-			return getTargetConnectionFactory().getConnection(spec);
-		}
-		else {
-			return getTargetConnectionFactory().getConnection();
-		}
+		ConnectionFactory connectionFactory = getTargetConnectionFactory();
+		Assert.state(connectionFactory != null, "No 'targetConnectionFactory' set");
+		return (spec != null ? connectionFactory.getConnection(spec) : connectionFactory.getConnection());
 	}
 
 }

spring-tx/src/main/java/org/springframework/transaction/interceptor/TransactionAspectSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -197,7 +197,7 @@ public abstract class TransactionAspectSupport implements BeanFactoryAware, Init
 	 * @see NameMatchTransactionAttributeSource
 	 * @see org.springframework.transaction.annotation.AnnotationTransactionAttributeSource
 	 */
-	public void setTransactionAttributeSources(TransactionAttributeSource[] transactionAttributeSources) {
+	public void setTransactionAttributeSources(TransactionAttributeSource... transactionAttributeSources) {
 		this.transactionAttributeSource = new CompositeTransactionAttributeSource(transactionAttributeSources);
 	}
 

spring-tx/src/main/java/org/springframework/transaction/interceptor/TransactionAttributeSourcePointcut.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,7 +34,7 @@ abstract class TransactionAttributeSourcePointcut extends StaticMethodMatcherPoi
 
 	@Override
 	public boolean matches(Method method, Class<?> targetClass) {
-		if (TransactionalProxy.class.isAssignableFrom(targetClass)) {
+		if (targetClass != null && TransactionalProxy.class.isAssignableFrom(targetClass)) {
 			return false;
 		}
 		TransactionAttributeSource tas = getTransactionAttributeSource();

spring-tx/src/test/java/org/springframework/transaction/TransactionSupportTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,11 +38,11 @@ public class TransactionSupportTests {
 		PlatformTransactionManager tm = new TestTransactionManager(false, true);
 		DefaultTransactionStatus status1 = (DefaultTransactionStatus)
 				tm.getTransaction(new DefaultTransactionDefinition(TransactionDefinition.PROPAGATION_SUPPORTS));
-		assertTrue("Must not have transaction", status1.getTransaction() == null);
+		assertFalse("Must not have transaction", status1.hasTransaction());
 
 		DefaultTransactionStatus status2 = (DefaultTransactionStatus)
 				tm.getTransaction(new DefaultTransactionDefinition(TransactionDefinition.PROPAGATION_REQUIRED));
-		assertTrue("Must have transaction", status2.getTransaction() != null);
+		assertTrue("Must have transaction", status2.hasTransaction());
 		assertTrue("Must be new transaction", status2.isNewTransaction());
 
 		try {

spring-web/src/main/java/org/springframework/http/HttpHeaders.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -784,13 +784,13 @@ public class HttpHeaders implements MultiValueMap<String, String>, Serializable
 	/**
 	 * Set the (new) entity tag of the body, as specified by the {@code ETag} header.
 	 */
-	public void setETag(String eTag) {
-		if (eTag != null) {
-			Assert.isTrue(eTag.startsWith("\"") || eTag.startsWith("W/"),
-					"Invalid eTag, does not start with W/ or \"");
-			Assert.isTrue(eTag.endsWith("\""), "Invalid eTag, does not end with \"");
+	public void setETag(String etag) {
+		if (etag != null) {
+			Assert.isTrue(etag.startsWith("\"") || etag.startsWith("W/"),
+					"Invalid ETag: does not start with W/ or \"");
+			Assert.isTrue(etag.endsWith("\""), "Invalid ETag: does not end with \"");
 		}
-		set(ETAG, eTag);
+		set(ETAG, etag);
 	}
 
 	/**

spring-web/src/main/java/org/springframework/web/util/WebUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -39,6 +39,7 @@ import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
+import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
 
 /**
@@ -153,16 +154,15 @@ public abstract class WebUtils {
 		String root = servletContext.getRealPath("/");
 		if (root == null) {
 			throw new IllegalStateException(
-				"Cannot set web app root system property when WAR file is not expanded");
+					"Cannot set web app root system property when WAR file is not expanded");
 		}
 		String param = servletContext.getInitParameter(WEB_APP_ROOT_KEY_PARAM);
 		String key = (param != null ? param : DEFAULT_WEB_APP_ROOT_KEY);
 		String oldValue = System.getProperty(key);
 		if (oldValue != null && !StringUtils.pathEquals(oldValue, root)) {
-			throw new IllegalStateException(
-				"Web app root system property already set to different value: '" +
-				key + "' = [" + oldValue + "] instead of [" + root + "] - " +
-				"Choose unique values for the 'webAppRootKey' context-param in your web.xml files!");
+			throw new IllegalStateException("Web app root system property already set to different value: '" +
+					key + "' = [" + oldValue + "] instead of [" + root + "] - " +
+					"Choose unique values for the 'webAppRootKey' context-param in your web.xml files!");
 		}
 		System.setProperty(key, root);
 		servletContext.log("Set web app root system property: '" + key + "' = [" + root + "]");
@@ -814,7 +814,7 @@ public abstract class WebUtils {
 	 * Check if the request is a same-origin one, based on {@code Origin}, {@code Host},
 	 * {@code Forwarded} and {@code X-Forwarded-Host} headers.
 	 * @return {@code true} if the request is a same-origin one, {@code false} in case
-	 * of cross-origin request.
+	 * of cross-origin request
 	 * @since 4.2
 	 */
 	public static boolean isSameOrigin(HttpRequest request) {
@@ -837,7 +837,8 @@ public abstract class WebUtils {
 		}
 		UriComponents actualUrl = urlBuilder.build();
 		UriComponents originUrl = UriComponentsBuilder.fromOriginHeader(origin).build();
-		return (actualUrl.getHost().equals(originUrl.getHost()) && getPort(actualUrl) == getPort(originUrl));
+		return (ObjectUtils.nullSafeEquals(actualUrl.getHost(), originUrl.getHost()) &&
+				getPort(actualUrl) == getPort(originUrl));
 	}
 
 	private static int getPort(UriComponents uri) {

spring-webmvc/src/main/java/org/springframework/web/servlet/config/annotation/BeanTypeNotPresentCondition.java

@@ -1,67 +0,0 @@
-/*
- * Copyright 2002-2014 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.web.servlet.config.annotation;
-
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-
-import org.springframework.beans.factory.BeanFactoryUtils;
-import org.springframework.beans.factory.ListableBeanFactory;
-import org.springframework.context.annotation.ConditionContext;
-import org.springframework.context.annotation.ConfigurationCondition;
-import org.springframework.core.type.AnnotatedTypeMetadata;
-import org.springframework.util.ObjectUtils;
-
-/**
- * A simple configuration condition that checks for the absence of any beans
- * of a given type.
- *
- * @author Rossen Stoyanchev
- * @since 4.1
- */
-class BeanTypeNotPresentCondition implements ConfigurationCondition {
-
-	private static final Log logger =
-			LogFactory.getLog("org.springframework.web.servlet.config.annotation.ViewResolution");
-
-	private final Class<?> beanType;
-
-
-	BeanTypeNotPresentCondition(Class<?> beanType) {
-		this.beanType = beanType;
-	}
-
-
-	@Override
-	public ConfigurationPhase getConfigurationPhase() {
-		return ConfigurationPhase.PARSE_CONFIGURATION;
-	}
-
-	public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
-		ListableBeanFactory factory = context.getBeanFactory();
-		String[] names = BeanFactoryUtils.beanNamesForTypeIncludingAncestors(factory, this.beanType, false, false);
-		if (ObjectUtils.isEmpty(names)) {
-			logger.debug("No bean of type [" + this.beanType + "]. Conditional configuration applies.");
-			return true;
-		}
-		else {
-			logger.debug("Found bean of type [" + this.beanType + "]. Conditional configuration does not apply.");
-			return false;
-		}
-	}
-
-}

spring-webmvc/src/main/java/org/springframework/web/servlet/tags/UrlTag.java

@@ -197,7 +197,7 @@ public class UrlTag extends HtmlEscapingAwareTag implements ParamAware {
 	 * Build the URL for the tag from the tag attributes and parameters.
 	 * @return the URL value as a String
 	 */
-	private String createUrl() throws JspException {
+	String createUrl() throws JspException {
 		HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
 		HttpServletResponse response = (HttpServletResponse) pageContext.getResponse();
 

spring-webmvc/src/test/java/org/springframework/web/servlet/tags/UrlTagTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,7 +16,6 @@
 
 package org.springframework.web.servlet.tags;
 
-import java.lang.reflect.Method;
 import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.List;
@@ -30,7 +29,6 @@ import org.junit.Test;
 
 import org.springframework.mock.web.test.MockHttpServletRequest;
 import org.springframework.mock.web.test.MockPageContext;
-import org.springframework.util.ReflectionUtils;
 
 import static org.hamcrest.Matchers.*;
 import static org.junit.Assert.*;
@@ -44,13 +42,15 @@ public class UrlTagTests extends AbstractTagTests {
 
 	private MockPageContext context;
 
+
 	@Before
-	public void setUp() throws Exception {
+	public void setup() throws Exception {
 		context = createPageContext();
 		tag = new UrlTag();
 		tag.setPageContext(context);
 	}
 
+
 	@Test
 	public void paramSupport() {
 		assertThat(tag, instanceOf(ParamAware.class));
@@ -66,7 +66,6 @@ public class UrlTagTests extends AbstractTagTests {
 	@Test
 	public void doEndTag() throws JspException {
 		tag.setValue("url/path");
-
 		tag.doStartTag();
 		int action = tag.doEndTag();
 
@@ -77,12 +76,10 @@ public class UrlTagTests extends AbstractTagTests {
 	public void varDefaultScope() throws JspException {
 		tag.setValue("url/path");
 		tag.setVar("var");
-
 		tag.doStartTag();
 		tag.doEndTag();
 
-		assertEquals("url/path", context.getAttribute("var",
-				PageContext.PAGE_SCOPE));
+		assertEquals("url/path", context.getAttribute("var", PageContext.PAGE_SCOPE));
 	}
 
 	@Test
@@ -90,19 +87,16 @@ public class UrlTagTests extends AbstractTagTests {
 		tag.setValue("url/path");
 		tag.setVar("var");
 		tag.setScope("request");
-
 		tag.doStartTag();
 		tag.doEndTag();
 
-		assertEquals("url/path", context.getAttribute("var",
-				PageContext.REQUEST_SCOPE));
+		assertEquals("url/path", context.getAttribute("var", PageContext.REQUEST_SCOPE));
 	}
 
 	@Test
 	public void setHtmlEscapeDefault() throws JspException {
 		tag.setValue("url/path");
 		tag.setVar("var");
-
 		tag.doStartTag();
 
 		Param param = new Param();
@@ -116,9 +110,7 @@ public class UrlTagTests extends AbstractTagTests {
 		tag.addParam(param);
 
 		tag.doEndTag();
-
-		assertEquals("url/path?n%20me=v%26l%3De&name=value2", context
-				.getAttribute("var"));
+		assertEquals("url/path?n%20me=v%26l%3De&name=value2", context.getAttribute("var"));
 	}
 
 	@Test
@@ -140,9 +132,7 @@ public class UrlTagTests extends AbstractTagTests {
 		tag.addParam(param);
 
 		tag.doEndTag();
-
-		assertEquals("url/path?n%20me=v%26l%3De&name=value2", context
-				.getAttribute("var"));
+		assertEquals("url/path?n%20me=v%26l%3De&name=value2", context.getAttribute("var"));
 	}
 
 	@Test
@@ -150,7 +140,6 @@ public class UrlTagTests extends AbstractTagTests {
 		tag.setValue("url/path");
 		tag.setVar("var");
 		tag.setHtmlEscape(true);
-
 		tag.doStartTag();
 
 		Param param = new Param();
@@ -164,9 +153,7 @@ public class UrlTagTests extends AbstractTagTests {
 		tag.addParam(param);
 
 		tag.doEndTag();
-
-		assertEquals("url/path?n%20me=v%26l%3De&name=value2", context
-				.getAttribute("var"));
+		assertEquals("url/path?n%20me=v%26l%3De&name=value2", context.getAttribute("var"));
 	}
 
 	@Test
@@ -174,7 +161,6 @@ public class UrlTagTests extends AbstractTagTests {
 		tag.setValue("url/path");
 		tag.setVar("var");
 		tag.setJavaScriptEscape(true);
-
 		tag.doStartTag();
 
 		Param param = new Param();
@@ -188,9 +174,7 @@ public class UrlTagTests extends AbstractTagTests {
 		tag.addParam(param);
 
 		tag.doEndTag();
-
-		assertEquals("url\\/path?n%20me=v%26l%3De&name=value2", context
-				.getAttribute("var"));
+		assertEquals("url\\/path?n%20me=v%26l%3De&name=value2", context.getAttribute("var"));
 	}
 
 	@Test
@@ -199,7 +183,6 @@ public class UrlTagTests extends AbstractTagTests {
 		tag.setVar("var");
 		tag.setHtmlEscape(true);
 		tag.setJavaScriptEscape(true);
-
 		tag.doStartTag();
 
 		Param param = new Param();
@@ -213,25 +196,22 @@ public class UrlTagTests extends AbstractTagTests {
 		tag.addParam(param);
 
 		tag.doEndTag();
-
-		assertEquals("url\\/path?n%20me=v%26l%3De&name=value2", context
-				.getAttribute("var"));
+		assertEquals("url\\/path?n%20me=v%26l%3De&name=value2", context.getAttribute("var"));
 	}
 
 	@Test
 	public void createQueryStringNoParams() throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		String queryString = tag.createQueryString(params, usedParams, true);
-
 		assertEquals("", queryString);
 	}
 
 	@Test
 	public void createQueryStringOneParam() throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("name");
@@ -239,15 +219,13 @@ public class UrlTagTests extends AbstractTagTests {
 		params.add(param);
 
 		String queryString = tag.createQueryString(params, usedParams, true);
-
 		assertEquals("?name=value", queryString);
 	}
 
 	@Test
-	public void createQueryStringOneParamForExsistingQueryString()
-			throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+	public void createQueryStringOneParamForExsistingQueryString() throws JspException {
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("name");
@@ -255,14 +233,13 @@ public class UrlTagTests extends AbstractTagTests {
 		params.add(param);
 
 		String queryString = tag.createQueryString(params, usedParams, false);
-
 		assertEquals("&name=value", queryString);
 	}
 
 	@Test
 	public void createQueryStringOneParamEmptyValue() throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("name");
@@ -270,14 +247,13 @@ public class UrlTagTests extends AbstractTagTests {
 		params.add(param);
 
 		String queryString = tag.createQueryString(params, usedParams, true);
-
 		assertEquals("?name=", queryString);
 	}
 
 	@Test
 	public void createQueryStringOneParamNullValue() throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("name");
@@ -285,31 +261,28 @@ public class UrlTagTests extends AbstractTagTests {
 		params.add(param);
 
 		String queryString = tag.createQueryString(params, usedParams, true);
-
 		assertEquals("?name", queryString);
 	}
 
 	@Test
 	public void createQueryStringOneParamAlreadyUsed() throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("name");
 		param.setValue("value");
 		params.add(param);
-
 		usedParams.add("name");
 
 		String queryString = tag.createQueryString(params, usedParams, true);
-
 		assertEquals("", queryString);
 	}
 
 	@Test
 	public void createQueryStringTwoParams() throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("name");
@@ -322,14 +295,13 @@ public class UrlTagTests extends AbstractTagTests {
 		params.add(param);
 
 		String queryString = tag.createQueryString(params, usedParams, true);
-
 		assertEquals("?name=value&name=value2", queryString);
 	}
 
 	@Test
 	public void createQueryStringUrlEncoding() throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("n me");
@@ -342,14 +314,13 @@ public class UrlTagTests extends AbstractTagTests {
 		params.add(param);
 
 		String queryString = tag.createQueryString(params, usedParams, true);
-
 		assertEquals("?n%20me=v%26l%3De&name=value2", queryString);
 	}
 
 	@Test
 	public void createQueryStringParamNullName() throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName(null);
@@ -357,14 +328,13 @@ public class UrlTagTests extends AbstractTagTests {
 		params.add(param);
 
 		String queryString = tag.createQueryString(params, usedParams, true);
-
 		assertEquals("", queryString);
 	}
 
 	@Test
 	public void createQueryStringParamEmptyName() throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("");
@@ -372,78 +342,65 @@ public class UrlTagTests extends AbstractTagTests {
 		params.add(param);
 
 		String queryString = tag.createQueryString(params, usedParams, true);
-
 		assertEquals("", queryString);
 	}
 
 	@Test
 	public void replaceUriTemplateParamsNoParams() throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
-
-		String uri = tag.replaceUriTemplateParams("url/path", params,
-				usedParams);
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
+		String uri = tag.replaceUriTemplateParams("url/path", params, usedParams);
 		assertEquals("url/path", uri);
 		assertEquals(0, usedParams.size());
 	}
 
 	@Test
-	public void replaceUriTemplateParamsTemplateWithoutParamMatch()
-			throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
-
-		String uri = tag.replaceUriTemplateParams("url/{path}", params,
-				usedParams);
+	public void replaceUriTemplateParamsTemplateWithoutParamMatch() throws JspException {
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
+		String uri = tag.replaceUriTemplateParams("url/{path}", params, usedParams);
 		assertEquals("url/{path}", uri);
 		assertEquals(0, usedParams.size());
 	}
 
 	@Test
-	public void replaceUriTemplateParamsTemplateWithParamMatch()
-			throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+	public void replaceUriTemplateParamsTemplateWithParamMatch() throws JspException {
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("name");
 		param.setValue("value");
 		params.add(param);
 
-		String uri = tag.replaceUriTemplateParams("url/{name}", params,
-				usedParams);
-
+		String uri = tag.replaceUriTemplateParams("url/{name}", params, usedParams);
 		assertEquals("url/value", uri);
 		assertEquals(1, usedParams.size());
 		assertTrue(usedParams.contains("name"));
 	}
 
 	@Test
-	public void replaceUriTemplateParamsTemplateWithParamMatchNamePreEncoding()
-			throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+	public void replaceUriTemplateParamsTemplateWithParamMatchNamePreEncoding() throws JspException {
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("n me");
 		param.setValue("value");
 		params.add(param);
 
-		String uri = tag.replaceUriTemplateParams("url/{n me}", params,
-				usedParams);
-
+		String uri = tag.replaceUriTemplateParams("url/{n me}", params, usedParams);
 		assertEquals("url/value", uri);
 		assertEquals(1, usedParams.size());
 		assertTrue(usedParams.contains("n me"));
 	}
 
 	@Test
-	public void replaceUriTemplateParamsTemplateWithParamMatchValueEncoded()
-			throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+	public void replaceUriTemplateParamsTemplateWithParamMatchValueEncoded() throws JspException {
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("name");
@@ -458,13 +415,10 @@ public class UrlTagTests extends AbstractTagTests {
 		assertTrue(usedParams.contains("name"));
 	}
 
-	// SPR-11401
-
-	@Test
-	public void replaceUriTemplateParamsTemplateWithPathSegment()
-			throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+	@Test  // SPR-11401
+	public void replaceUriTemplateParamsTemplateWithPathSegment() throws JspException {
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("name");
@@ -479,10 +433,9 @@ public class UrlTagTests extends AbstractTagTests {
 	}
 
 	@Test
-	public void replaceUriTemplateParamsTemplateWithPath()
-			throws JspException {
-		List<Param> params = new LinkedList<Param>();
-		Set<String> usedParams = new HashSet<String>();
+	public void replaceUriTemplateParamsTemplateWithPath() throws JspException {
+		List<Param> params = new LinkedList<>();
+		Set<String> usedParams = new HashSet<>();
 
 		Param param = new Param();
 		param.setName("name");
@@ -490,7 +443,6 @@ public class UrlTagTests extends AbstractTagTests {
 		params.add(param);
 
 		String uri = tag.replaceUriTemplateParams("url/{name}", params, usedParams);
-
 		assertEquals("url/my/Id", uri);
 		assertEquals(1, usedParams.size());
 		assertTrue(usedParams.contains("name"));
@@ -499,89 +451,71 @@ public class UrlTagTests extends AbstractTagTests {
 	@Test
 	public void createUrlRemoteServer() throws JspException {
 		tag.setValue("http://www.springframework.org/");
-
 		tag.doStartTag();
 
-		// String uri = tag.createUrl();
-		String uri = invokeCreateUrl(tag);
-
+		String uri = tag.createUrl();
 		assertEquals("http://www.springframework.org/", uri);
 	}
 
 	@Test
 	public void createUrlRelative() throws JspException {
 		tag.setValue("url/path");
-
 		tag.doStartTag();
 
-		String uri = invokeCreateUrl(tag);
-
+		String uri = tag.createUrl();
 		assertEquals("url/path", uri);
 	}
 
 	@Test
 	public void createUrlLocalContext() throws JspException {
-		((MockHttpServletRequest) context.getRequest())
-				.setContextPath("/app-context");
+		((MockHttpServletRequest) context.getRequest()).setContextPath("/app-context");
 
 		tag.setValue("/url/path");
-
 		tag.doStartTag();
 
-		String uri = invokeCreateUrl(tag);
-
+		String uri = tag.createUrl();
 		assertEquals("/app-context/url/path", uri);
 	}
 
 	@Test
 	public void createUrlRemoteContext() throws JspException {
-		((MockHttpServletRequest) context.getRequest())
-				.setContextPath("/app-context");
+		((MockHttpServletRequest) context.getRequest()).setContextPath("/app-context");
 
 		tag.setValue("/url/path");
 		tag.setContext("some-other-context");
-
 		tag.doStartTag();
 
-		String uri = invokeCreateUrl(tag);
-
+		String uri = tag.createUrl();
 		assertEquals("/some-other-context/url/path", uri);
 	}
 
 	@Test
 	public void createUrlRemoteContextWithSlash() throws JspException {
-		((MockHttpServletRequest) context.getRequest())
-				.setContextPath("/app-context");
+		((MockHttpServletRequest) context.getRequest()).setContextPath("/app-context");
 
 		tag.setValue("/url/path");
 		tag.setContext("/some-other-context");
-
 		tag.doStartTag();
 
-		String uri = invokeCreateUrl(tag);
-
+		String uri = tag.createUrl();
 		assertEquals("/some-other-context/url/path", uri);
 	}
 
 	@Test
 	public void createUrlRemoteContextSingleSlash() throws JspException {
-		((MockHttpServletRequest) context.getRequest())
-				.setContextPath("/app-context");
+		((MockHttpServletRequest) context.getRequest()).setContextPath("/app-context");
 
 		tag.setValue("/url/path");
 		tag.setContext("/");
-
 		tag.doStartTag();
 
-		String uri = invokeCreateUrl(tag);
-
+		String uri = tag.createUrl();
 		assertEquals("/url/path", uri);
 	}
 
 	@Test
 	public void createUrlWithParams() throws JspException {
 		tag.setValue("url/path");
-
 		tag.doStartTag();
 
 		Param param = new Param();
@@ -594,15 +528,13 @@ public class UrlTagTests extends AbstractTagTests {
 		param.setValue("v lue");
 		tag.addParam(param);
 
-		String uri = invokeCreateUrl(tag);
-
+		String uri = tag.createUrl();
 		assertEquals("url/path?name=value&n%20me=v%20lue", uri);
 	}
 
 	@Test
 	public void createUrlWithTemplateParams() throws JspException {
 		tag.setValue("url/{name}");
-
 		tag.doStartTag();
 
 		Param param = new Param();
@@ -615,16 +547,13 @@ public class UrlTagTests extends AbstractTagTests {
 		param.setValue("v lue");
 		tag.addParam(param);
 
-		String uri = invokeCreateUrl(tag);
-
+		String uri = tag.createUrl();
 		assertEquals("url/value?n%20me=v%20lue", uri);
 	}
 
 	@Test
-	public void createUrlWithParamAndExsistingQueryString()
-			throws JspException {
+	public void createUrlWithParamAndExistingQueryString() throws JspException {
 		tag.setValue("url/path?foo=bar");
-
 		tag.doStartTag();
 
 		Param param = new Param();
@@ -632,29 +561,8 @@ public class UrlTagTests extends AbstractTagTests {
 		param.setValue("value");
 		tag.addParam(param);
 
-		String uri = invokeCreateUrl(tag);
-
+		String uri = tag.createUrl();
 		assertEquals("url/path?foo=bar&name=value", uri);
 	}
 
-	@Test
-	public void jspWriterOutput() {
-		// TODO assert that the output to the JspWriter is the expected output
-	}
-
-	@Test
-	public void servletRepsonseEncodeUrl() {
-		// TODO assert that HttpServletResponse.encodeURL(String) is invoked for
-		// non absolute urls
-	}
-
-	// support methods
-
-	private String invokeCreateUrl(UrlTag tag) {
-		Method createUrl = ReflectionUtils.findMethod(tag.getClass(),
-				"createUrl");
-		ReflectionUtils.makeAccessible(createUrl);
-		return (String) ReflectionUtils.invokeMethod(createUrl, tag);
-	}
-
 }

src/test/java/com/foo/ComponentBeanDefinitionParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,32 +18,30 @@ package com.foo;
 
 import java.util.List;
 
+import org.w3c.dom.Element;
+
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.support.AbstractBeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.ManagedList;
 import org.springframework.beans.factory.xml.AbstractBeanDefinitionParser;
 import org.springframework.beans.factory.xml.ParserContext;
+import org.springframework.util.CollectionUtils;
 import org.springframework.util.xml.DomUtils;
-import org.w3c.dom.Element;
 
 public class ComponentBeanDefinitionParser extends AbstractBeanDefinitionParser {
 
 	@Override
-	protected AbstractBeanDefinition parseInternal(Element element,
-			ParserContext parserContext) {
+	protected AbstractBeanDefinition parseInternal(Element element, ParserContext parserContext) {
 		return parseComponentElement(element);
 	}
 
 	private static AbstractBeanDefinition parseComponentElement(Element element) {
-		BeanDefinitionBuilder factory = BeanDefinitionBuilder
-				.rootBeanDefinition(ComponentFactoryBean.class);
-
+		BeanDefinitionBuilder factory = BeanDefinitionBuilder.rootBeanDefinition(ComponentFactoryBean.class);
 		factory.addPropertyValue("parent", parseComponent(element));
 
-		List<Element> childElements = DomUtils.getChildElementsByTagName(
-				element, "component");
-		if (childElements != null && childElements.size() > 0) {
+		List<Element> childElements = DomUtils.getChildElementsByTagName(element, "component");
+		if (!CollectionUtils.isEmpty(childElements)) {
 			parseChildComponents(childElements, factory);
 		}
 
@@ -51,19 +49,17 @@ public class ComponentBeanDefinitionParser extends AbstractBeanDefinitionParser
 	}
 
 	private static BeanDefinition parseComponent(Element element) {
-		BeanDefinitionBuilder component = BeanDefinitionBuilder
-				.rootBeanDefinition(Component.class);
+		BeanDefinitionBuilder component = BeanDefinitionBuilder.rootBeanDefinition(Component.class);
 		component.addPropertyValue("name", element.getAttribute("name"));
 		return component.getBeanDefinition();
 	}
 
-	private static void parseChildComponents(List<Element> childElements,
-			BeanDefinitionBuilder factory) {
-		ManagedList<BeanDefinition> children = new ManagedList<BeanDefinition>(
-				childElements.size());
+	private static void parseChildComponents(List<Element> childElements, BeanDefinitionBuilder factory) {
+		ManagedList<BeanDefinition> children = new ManagedList<BeanDefinition>(childElements.size());
 		for (Element element : childElements) {
 			children.add(parseComponentElement(element));
 		}
 		factory.addPropertyValue("children", children);
 	}
+
 }