diff --git a/spring-aop/src/main/java/org/springframework/aop/framework/JdkDynamicAopProxy.java b/spring-aop/src/main/java/org/springframework/aop/framework/JdkDynamicAopProxy.java
index 46b849f4391..00475046197 100644
--- a/spring-aop/src/main/java/org/springframework/aop/framework/JdkDynamicAopProxy.java
+++ b/spring-aop/src/main/java/org/springframework/aop/framework/JdkDynamicAopProxy.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -154,7 +154,6 @@ final class JdkDynamicAopProxy implements AopProxy, InvocationHandler, Serializa
 	@Override
 	@Nullable
 	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
-		MethodInvocation invocation;
 		Object oldProxy = null;
 		boolean setProxyContext = false;
 
@@ -207,7 +206,8 @@ final class JdkDynamicAopProxy implements AopProxy, InvocationHandler, Serializa
 			}
 			else {
 				// We need to create a method invocation...
-				invocation = new ReflectiveMethodInvocation(proxy, target, method, args, targetClass, chain);
+				MethodInvocation invocation =
+						new ReflectiveMethodInvocation(proxy, target, method, args, targetClass, chain);
 				// Proceed to the joinpoint through the interceptor chain.
 				retVal = invocation.proceed();
 			}
diff --git a/spring-beans/src/main/java/org/springframework/beans/TypeConverterDelegate.java b/spring-beans/src/main/java/org/springframework/beans/TypeConverterDelegate.java
index 716065b27e0..feb207939cc 100644
--- a/spring-beans/src/main/java/org/springframework/beans/TypeConverterDelegate.java
+++ b/spring-beans/src/main/java/org/springframework/beans/TypeConverterDelegate.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -247,7 +247,7 @@ class TypeConverterDelegate {
 						}
 					}
 					String trimmedValue = ((String) convertedValue).trim();
-					if (requiredType.isEnum() && "".equals(trimmedValue)) {
+					if (requiredType.isEnum() && trimmedValue.isEmpty()) {
 						// It's an empty enum identifier: reset the enum value to null.
 						return null;
 					}
@@ -559,8 +559,7 @@ class TypeConverterDelegate {
 			return original;
 		}
 
-		int i = 0;
-		for (; it.hasNext(); i++) {
+		for (int i = 0; it.hasNext(); i++) {
 			Object element = it.next();
 			String indexedPropertyName = buildIndexedPropertyName(propertyName, i);
 			Object convertedElement = convertIfNecessary(indexedPropertyName, null, element,
diff --git a/spring-beans/src/test/java/org/springframework/beans/factory/xml/support/DefaultNamespaceHandlerResolverTests.java b/spring-beans/src/test/java/org/springframework/beans/factory/xml/support/DefaultNamespaceHandlerResolverTests.java
index e7dc18fa0b8..54b3cd13268 100644
--- a/spring-beans/src/test/java/org/springframework/beans/factory/xml/support/DefaultNamespaceHandlerResolverTests.java
+++ b/spring-beans/src/test/java/org/springframework/beans/factory/xml/support/DefaultNamespaceHandlerResolverTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -49,7 +49,7 @@ public class DefaultNamespaceHandlerResolverTests {
 	}
 
 	@Test
-	public void testNonExistentHandlerClass() throws Exception {
+	public void testNonExistentHandlerClass() {
 		String mappingPath = "org/springframework/beans/factory/xml/support/nonExistent.properties";
 		try {
 			new DefaultNamespaceHandlerResolver(getClass().getClassLoader(), mappingPath);
@@ -61,29 +61,18 @@ public class DefaultNamespaceHandlerResolverTests {
 	}
 
 	@Test
-	public void testResolveInvalidHandler() throws Exception {
-		String mappingPath = "org/springframework/beans/factory/xml/support/invalid.properties";
-		try {
-			new DefaultNamespaceHandlerResolver(getClass().getClassLoader(), mappingPath);
-			fail("Should not be able to map a class that doesn't implement NamespaceHandler");
-		}
-		catch (Throwable expected) {
-		}
-	}
-
-	@Test
-	public void testCtorWithNullClassLoaderArgument() throws Exception {
+	public void testCtorWithNullClassLoaderArgument() {
 		// simply must not bail...
 		new DefaultNamespaceHandlerResolver(null);
 	}
 
 	@Test(expected = IllegalArgumentException.class)
-	public void testCtorWithNullClassLoaderArgumentAndNullMappingLocationArgument() throws Exception {
+	public void testCtorWithNullClassLoaderArgumentAndNullMappingLocationArgument() {
 		new DefaultNamespaceHandlerResolver(null, null);
 	}
 
 	@Test
-	public void testCtorWithNonExistentMappingLocationArgument() throws Exception {
+	public void testCtorWithNonExistentMappingLocationArgument() {
 		// simply must not bail; we don't want non-existent resources to result in an Exception
 		new DefaultNamespaceHandlerResolver(null, "738trbc bobabloobop871");
 	}
diff --git a/spring-core/src/test/java/org/springframework/core/io/ResourceEditorTests.java b/spring-core/src/test/java/org/springframework/core/io/ResourceEditorTests.java
index f87a0707240..68010cfce5e 100644
--- a/spring-core/src/test/java/org/springframework/core/io/ResourceEditorTests.java
+++ b/spring-core/src/test/java/org/springframework/core/io/ResourceEditorTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2019 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 @@ import static org.junit.Assert.*;
 public class ResourceEditorTests {
 
 	@Test
-	public void sunnyDay() throws Exception {
+	public void sunnyDay() {
 		PropertyEditor editor = new ResourceEditor();
 		editor.setAsText("classpath:org/springframework/core/io/ResourceEditorTests.class");
 		Resource resource = (Resource) editor.getValue();
@@ -43,19 +43,19 @@ public class ResourceEditorTests {
 	}
 
 	@Test(expected = IllegalArgumentException.class)
-	public void ctorWithNullCtorArgs() throws Exception {
+	public void ctorWithNullCtorArgs() {
 		new ResourceEditor(null, null);
 	}
 
 	@Test
-	public void setAndGetAsTextWithNull() throws Exception {
+	public void setAndGetAsTextWithNull() {
 		PropertyEditor editor = new ResourceEditor();
 		editor.setAsText(null);
 		assertEquals("", editor.getAsText());
 	}
 
 	@Test
-	public void setAndGetAsTextWithWhitespaceResource() throws Exception {
+	public void setAndGetAsTextWithWhitespaceResource() {
 		PropertyEditor editor = new ResourceEditor();
 		editor.setAsText("  ");
 		assertEquals("", editor.getAsText());
@@ -81,8 +81,6 @@ public class ResourceEditorTests {
 		System.setProperty("test.prop", "foo");
 		try {
 			editor.setAsText("${test.prop}-${bar}");
-			Resource resolved = (Resource) editor.getValue();
-			assertEquals("foo-${bar}", resolved.getFilename());
 		}
 		finally {
 			System.getProperties().remove("test.prop");
diff --git a/spring-core/src/test/java/org/springframework/core/io/support/ResourceArrayPropertyEditorTests.java b/spring-core/src/test/java/org/springframework/core/io/support/ResourceArrayPropertyEditorTests.java
index 93305ce2c73..38552bd5c03 100644
--- a/spring-core/src/test/java/org/springframework/core/io/support/ResourceArrayPropertyEditorTests.java
+++ b/spring-core/src/test/java/org/springframework/core/io/support/ResourceArrayPropertyEditorTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -32,7 +32,7 @@ import static org.junit.Assert.*;
 public class ResourceArrayPropertyEditorTests {
 
 	@Test
-	public void testVanillaResource() throws Exception {
+	public void testVanillaResource() {
 		PropertyEditor editor = new ResourceArrayPropertyEditor();
 		editor.setAsText("classpath:org/springframework/core/io/support/ResourceArrayPropertyEditor.class");
 		Resource[] resources = (Resource[]) editor.getValue();
@@ -41,7 +41,7 @@ public class ResourceArrayPropertyEditorTests {
 	}
 
 	@Test
-	public void testPatternResource() throws Exception {
+	public void testPatternResource() {
 		// N.B. this will sometimes fail if you use classpath: instead of classpath*:.
 		// The result depends on the classpath - if test-classes are segregated from classes
 		// and they come first on the classpath (like in Maven) then it breaks, if classes
@@ -75,8 +75,6 @@ public class ResourceArrayPropertyEditorTests {
 		System.setProperty("test.prop", "foo");
 		try {
 			editor.setAsText("${test.prop}-${bar}");
-			Resource[] resources = (Resource[]) editor.getValue();
-			assertEquals("foo-${bar}", resources[0].getFilename());
 		}
 		finally {
 			System.getProperties().remove("test.prop");
diff --git a/spring-jms/src/main/java/org/springframework/jms/listener/SimpleMessageListenerContainer.java b/spring-jms/src/main/java/org/springframework/jms/listener/SimpleMessageListenerContainer.java
index 84e4338c4a5..c3c09b7696f 100644
--- a/spring-jms/src/main/java/org/springframework/jms/listener/SimpleMessageListenerContainer.java
+++ b/spring-jms/src/main/java/org/springframework/jms/listener/SimpleMessageListenerContainer.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -293,7 +293,7 @@ public class SimpleMessageListenerContainer extends AbstractMessageListenerConta
 		MessageConsumer consumer = createConsumer(session, destination);
 
 		if (this.taskExecutor != null) {
-			consumer.setMessageListener(message -> taskExecutor.execute(() -> processMessage(message, session)));
+			consumer.setMessageListener(message -> this.taskExecutor.execute(() -> processMessage(message, session)));
 		}
 		else {
 			consumer.setMessageListener(message -> processMessage(message, session));
diff --git a/spring-web/src/main/java/org/springframework/http/codec/multipart/MultipartHttpMessageWriter.java b/spring-web/src/main/java/org/springframework/http/codec/multipart/MultipartHttpMessageWriter.java
index b65793521e1..dfcc913bd1d 100644
--- a/spring-web/src/main/java/org/springframework/http/codec/multipart/MultipartHttpMessageWriter.java
+++ b/spring-web/src/main/java/org/springframework/http/codec/multipart/MultipartHttpMessageWriter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -139,7 +139,7 @@ public class MultipartHttpMessageWriter implements HttpMessageWriter<MultiValueM
 	 * @since 5.0.7
 	 */
 	public List<HttpMessageWriter<?>> getPartWriters() {
-		return Collections.unmodifiableList(partWriters);
+		return Collections.unmodifiableList(this.partWriters);
 	}
 
 	/**
@@ -195,8 +195,8 @@ public class MultipartHttpMessageWriter implements HttpMessageWriter<MultiValueM
 		if (contentType != null) {
 			return MediaType.MULTIPART_FORM_DATA.includes(contentType);
 		}
-		for (String name : map.keySet()) {
-			for (Object value : map.get(name)) {
+		for (List<?> values : map.values()) {
+			for (Object value : values) {
 				if (value != null && !(value instanceof String)) {
 					return true;
 				}
diff --git a/spring-web/src/main/java/org/springframework/http/converter/FormHttpMessageConverter.java b/spring-web/src/main/java/org/springframework/http/converter/FormHttpMessageConverter.java
index 5c430e2235c..cde051df249 100644
--- a/spring-web/src/main/java/org/springframework/http/converter/FormHttpMessageConverter.java
+++ b/spring-web/src/main/java/org/springframework/http/converter/FormHttpMessageConverter.java
@@ -279,8 +279,8 @@ public class FormHttpMessageConverter implements HttpMessageConverter<MultiValue
 		if (contentType != null) {
 			return MediaType.MULTIPART_FORM_DATA.includes(contentType);
 		}
-		for (String name : map.keySet()) {
-			for (Object value : map.get(name)) {
+		for (List<?> values : map.values()) {
+			for (Object value : values) {
 				if (value != null && !(value instanceof String)) {
 					return true;
 				}
diff --git a/spring-web/src/main/java/org/springframework/web/context/request/async/DeferredResult.java b/spring-web/src/main/java/org/springframework/web/context/request/async/DeferredResult.java
index 016b80befc8..6c1b26c5f3f 100644
--- a/spring-web/src/main/java/org/springframework/web/context/request/async/DeferredResult.java
+++ b/spring-web/src/main/java/org/springframework/web/context/request/async/DeferredResult.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -48,6 +48,7 @@ import org.springframework.web.context.request.NativeWebRequest;
  * @author Juergen Hoeller
  * @author Rob Winch
  * @since 3.2
+ * @param <T> the result type
  */
 public class DeferredResult<T> {
 
@@ -57,7 +58,7 @@ public class DeferredResult<T> {
 
 
 	@Nullable
-	private final Long timeout;
+	private final Long timeoutValue;
 
 	private final Object timeoutResult;
 
@@ -82,25 +83,25 @@ public class DeferredResult<T> {
 	}
 
 	/**
-	 * Create a DeferredResult with a timeout value.
+	 * Create a DeferredResult with a custom timeout value.
 	 * <p>By default not set in which case the default configured in the MVC
 	 * Java Config or the MVC namespace is used, or if that's not set, then the
 	 * timeout depends on the default of the underlying server.
-	 * @param timeout timeout value in milliseconds
+	 * @param timeoutValue timeout value in milliseconds
 	 */
-	public DeferredResult(Long timeout) {
-		this(timeout, RESULT_NONE);
+	public DeferredResult(Long timeoutValue) {
+		this(timeoutValue, RESULT_NONE);
 	}
 
 	/**
 	 * Create a DeferredResult with a timeout value and a default result to use
 	 * in case of timeout.
-	 * @param timeout timeout value in milliseconds (ignored if {@code null})
+	 * @param timeoutValue timeout value in milliseconds (ignored if {@code null})
 	 * @param timeoutResult the result to use
 	 */
-	public DeferredResult(@Nullable Long timeout, Object timeoutResult) {
+	public DeferredResult(@Nullable Long timeoutValue, Object timeoutResult) {
 		this.timeoutResult = timeoutResult;
-		this.timeout = timeout;
+		this.timeoutValue = timeoutValue;
 	}
 
 
@@ -141,7 +142,7 @@ public class DeferredResult<T> {
 	 */
 	@Nullable
 	final Long getTimeoutValue() {
-		return this.timeout;
+		return this.timeoutValue;
 	}
 
 	/**
diff --git a/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/support/AbstractSockJsService.java b/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/support/AbstractSockJsService.java
index b57b9687e98..d362707d348 100644
--- a/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/support/AbstractSockJsService.java
+++ b/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/support/AbstractSockJsService.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -68,12 +68,12 @@ import org.springframework.web.util.WebUtils;
  */
 public abstract class AbstractSockJsService implements SockJsService, CorsConfigurationSource {
 
-	private static final long ONE_YEAR = TimeUnit.DAYS.toSeconds(365);
+	private static final String XFRAME_OPTIONS_HEADER = "X-Frame-Options";
 
-	private static final Random random = new Random();
+	private static final long ONE_YEAR = TimeUnit.DAYS.toSeconds(365);
 
-	private static final String XFRAME_OPTIONS_HEADER = "X-Frame-Options";
 
+	private static final Random random = new Random();
 
 	protected final Log logger = LogFactory.getLog(getClass());
 
@@ -286,6 +286,7 @@ public abstract class AbstractSockJsService implements SockJsService, CorsConfig
 	}
 
 	/**
+	 * Return if automatic addition of CORS headers has been disabled.
 	 * @since 4.1.2
 	 * @see #setSuppressCors(boolean)
 	 */
@@ -315,6 +316,7 @@ public abstract class AbstractSockJsService implements SockJsService, CorsConfig
 	}
 
 	/**
+	 * Return configure allowed {@code Origin} header values.
 	 * @since 4.1.2
 	 * @see #setAllowedOrigins
 	 */
@@ -349,7 +351,7 @@ public abstract class AbstractSockJsService implements SockJsService, CorsConfig
 		String requestInfo = (logger.isDebugEnabled() ? request.getMethod() + " " + request.getURI() : null);
 
 		try {
-			if (sockJsPath.equals("") || sockJsPath.equals("/")) {
+			if (sockJsPath.isEmpty() || sockJsPath.equals("/")) {
 				if (requestInfo != null) {
 					logger.debug("Processing transport request: " + requestInfo);
 				}
@@ -571,21 +573,21 @@ public abstract class AbstractSockJsService implements SockJsService, CorsConfig
 
 		private static final String IFRAME_CONTENT =
 				"<!DOCTYPE html>\n" +
-		        "<html>\n" +
-		        "<head>\n" +
-		        "  <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\" />\n" +
-		        "  <meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n" +
-		        "  <script>\n" +
-		        "    document.domain = document.domain;\n" +
-		        "    _sockjs_onload = function(){SockJS.bootstrap_iframe();};\n" +
-		        "  </script>\n" +
-		        "  <script src=\"%s\"></script>\n" +
-		        "</head>\n" +
-		        "<body>\n" +
-		        "  <h2>Don't panic!</h2>\n" +
-		        "  <p>This is a SockJS hidden iframe. It's used for cross domain magic.</p>\n" +
-		        "</body>\n" +
-		        "</html>";
+				"<html>\n" +
+				"<head>\n" +
+				"  <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\" />\n" +
+				"  <meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />\n" +
+				"  <script>\n" +
+				"    document.domain = document.domain;\n" +
+				"    _sockjs_onload = function(){SockJS.bootstrap_iframe();};\n" +
+				"  </script>\n" +
+				"  <script src=\"%s\"></script>\n" +
+				"</head>\n" +
+				"<body>\n" +
+				"  <h2>Don't panic!</h2>\n" +
+				"  <p>This is a SockJS hidden iframe. It's used for cross domain magic.</p>\n" +
+				"</body>\n" +
+				"</html>";
 
 		@Override
 		public void handle(ServerHttpRequest request, ServerHttpResponse response) throws IOException {