Avoid defensive checks against java.time API

Issue: SPR-13188

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

@@ -26,6 +26,7 @@ import java.net.URI;
 import java.net.URL;
 import java.nio.charset.Charset;
 import java.nio.file.Path;
+import java.time.ZoneId;
 import java.util.Collection;
 import java.util.Currency;
 import java.util.HashMap;
@@ -89,19 +90,6 @@ import org.springframework.util.ClassUtils;
  */
 public class PropertyEditorRegistrySupport implements PropertyEditorRegistry {
 
-	private static Class<?> zoneIdClass;
-
-	static {
-		try {
-			zoneIdClass = ClassUtils.forName("java.time.ZoneId", PropertyEditorRegistrySupport.class.getClassLoader());
-		}
-		catch (ClassNotFoundException ex) {
-			// Java 8 ZoneId class not available
-			zoneIdClass = null;
-		}
-	}
-
-
 	private ConversionService conversionService;
 
 	private boolean defaultEditorsActive = false;
@@ -222,9 +210,7 @@ public class PropertyEditorRegistrySupport implements PropertyEditorRegistry {
 		this.defaultEditors.put(URI.class, new URIEditor());
 		this.defaultEditors.put(URL.class, new URLEditor());
 		this.defaultEditors.put(UUID.class, new UUIDEditor());
-		if (zoneIdClass != null) {
-			this.defaultEditors.put(zoneIdClass, new ZoneIdEditor());
-		}
+		this.defaultEditors.put(ZoneId.class, new ZoneIdEditor());
 
 		// Default instances of collection editors.
 		// Can be overridden by registering custom instances of those as custom editors.

spring-context/src/main/java/org/springframework/format/support/DefaultFormattingConversionService.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.
@@ -21,10 +21,10 @@ import org.springframework.format.FormatterRegistry;
 import org.springframework.format.datetime.DateFormatterRegistrar;
 import org.springframework.format.datetime.joda.JodaTimeFormatterRegistrar;
 import org.springframework.format.datetime.standard.DateTimeFormatterRegistrar;
+import org.springframework.format.number.NumberFormatAnnotationFormatterFactory;
 import org.springframework.format.number.money.CurrencyUnitFormatter;
 import org.springframework.format.number.money.Jsr354NumberFormatAnnotationFormatterFactory;
 import org.springframework.format.number.money.MonetaryAmountFormatter;
-import org.springframework.format.number.NumberFormatAnnotationFormatterFactory;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.StringValueResolver;
 
@@ -49,9 +49,6 @@ public class DefaultFormattingConversionService extends FormattingConversionServ
 	private static final boolean jsr354Present = ClassUtils.isPresent(
 			"javax.money.MonetaryAmount", DefaultFormattingConversionService.class.getClassLoader());
 
-	private static final boolean jsr310Present = ClassUtils.isPresent(
-			"java.time.LocalDate", DefaultFormattingConversionService.class.getClassLoader());
-
 	private static final boolean jodaTimePresent = ClassUtils.isPresent(
 			"org.joda.time.LocalDate", DefaultFormattingConversionService.class.getClassLoader());
 
@@ -112,10 +109,10 @@ public class DefaultFormattingConversionService extends FormattingConversionServ
 		}
 
 		// Default handling of date-time values
-		if (jsr310Present) {
-			// just handling JSR-310 specific date and time types
-			new DateTimeFormatterRegistrar().registerFormatters(formatterRegistry);
-		}
+
+		// just handling JSR-310 specific date and time types
+		new DateTimeFormatterRegistrar().registerFormatters(formatterRegistry);
+
 		if (jodaTimePresent) {
 			// handles Joda-specific types as well as Date, Calendar, Long
 			new JodaTimeFormatterRegistrar().registerFormatters(formatterRegistry);

spring-core/src/main/java/org/springframework/core/convert/support/DefaultConversionService.java

@@ -23,7 +23,6 @@ import java.util.UUID;
 
 import org.springframework.core.convert.ConversionService;
 import org.springframework.core.convert.converter.ConverterRegistry;
-import org.springframework.util.ClassUtils;
 
 /**
  * A specialization of {@link GenericConversionService} configured by default with
@@ -40,11 +39,6 @@ import org.springframework.util.ClassUtils;
  */
 public class DefaultConversionService extends GenericConversionService {
 
-	/** Java 8's java.time package available? */
-	private static final boolean jsr310Available =
-			ClassUtils.isPresent("java.time.ZoneId", DefaultConversionService.class.getClassLoader());
-
-
 	/**
 	 * Create a new {@code DefaultConversionService} with the set of
 	 * {@linkplain DefaultConversionService#addDefaultConverters(ConverterRegistry) default converters}.
@@ -67,9 +61,9 @@ public class DefaultConversionService extends GenericConversionService {
 		addCollectionConverters(converterRegistry);
 
 		converterRegistry.addConverter(new ByteBufferConverter((ConversionService) converterRegistry));
-		if (jsr310Available) {
-			Jsr310ConverterRegistrar.registerJsr310Converters(converterRegistry);
-		}
+		converterRegistry.addConverter(new StringToTimeZoneConverter());
+		converterRegistry.addConverter(new ZoneIdToTimeZoneConverter());
+		converterRegistry.addConverter(new ZonedDateTimeToCalendarConverter());
 
 		converterRegistry.addConverter(new ObjectToObjectConverter());
 		converterRegistry.addConverter(new IdToEntityConverter((ConversionService) converterRegistry));
@@ -149,17 +143,4 @@ public class DefaultConversionService extends GenericConversionService {
 		converterRegistry.addConverter(UUID.class, String.class, new ObjectToStringConverter());
 	}
 
-
-	/**
-	 * Inner class to avoid a hard-coded dependency on Java 8's {@code java.time} package.
-	 */
-	private static final class Jsr310ConverterRegistrar {
-
-		public static void registerJsr310Converters(ConverterRegistry converterRegistry) {
-			converterRegistry.addConverter(new StringToTimeZoneConverter());
-			converterRegistry.addConverter(new ZoneIdToTimeZoneConverter());
-			converterRegistry.addConverter(new ZonedDateTimeToCalendarConverter());
-		}
-	}
-
 }

spring-web/src/main/java/org/springframework/http/converter/json/Jackson2ObjectMapperBuilder.java

@@ -753,16 +753,13 @@ public class Jackson2ObjectMapperBuilder {
 			// jackson-datatype-jdk8 not available
 		}
 
-		// Java 8 java.time package present?
-		if (ClassUtils.isPresent("java.time.LocalDate", this.moduleClassLoader)) {
-			try {
-				Class<? extends Module> javaTimeModule = (Class<? extends Module>)
-						ClassUtils.forName("com.fasterxml.jackson.datatype.jsr310.JavaTimeModule", this.moduleClassLoader);
-				objectMapper.registerModule(BeanUtils.instantiateClass(javaTimeModule));
-			}
-			catch (ClassNotFoundException ex) {
-				// jackson-datatype-jsr310 not available
-			}
+		try {
+			Class<? extends Module> javaTimeModule = (Class<? extends Module>)
+					ClassUtils.forName("com.fasterxml.jackson.datatype.jsr310.JavaTimeModule", this.moduleClassLoader);
+			objectMapper.registerModule(BeanUtils.instantiateClass(javaTimeModule));
+		}
+		catch (ClassNotFoundException ex) {
+			// jackson-datatype-jsr310 not available
 		}
 
 		// Joda-Time present?

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ServletRequestMethodArgumentResolver.java

@@ -70,7 +70,7 @@ public class ServletRequestMethodArgumentResolver implements HandlerMethodArgume
 				Principal.class.isAssignableFrom(paramType) ||
 				Locale.class == paramType ||
 				TimeZone.class == paramType ||
-				"java.time.ZoneId".equals(paramType.getName()) ||
+				ZoneId.class == paramType ||
 				InputStream.class.isAssignableFrom(paramType) ||
 				Reader.class.isAssignableFrom(paramType) ||
 				HttpMethod.class == paramType);
@@ -110,8 +110,9 @@ public class ServletRequestMethodArgumentResolver implements HandlerMethodArgume
 			TimeZone timeZone = RequestContextUtils.getTimeZone(request);
 			return (timeZone != null ? timeZone : TimeZone.getDefault());
 		}
-		else if ("java.time.ZoneId".equals(paramType.getName())) {
-			return ZoneIdResolver.resolveZoneId(request);
+		else if (ZoneId.class == paramType) {
+			TimeZone timeZone = RequestContextUtils.getTimeZone(request);
+			return (timeZone != null ? timeZone.toZoneId() : ZoneId.systemDefault());
 		}
 		else if (InputStream.class.isAssignableFrom(paramType)) {
 			return request.getInputStream();
@@ -126,16 +127,4 @@ public class ServletRequestMethodArgumentResolver implements HandlerMethodArgume
 		}
 	}
 
-
-	/**
-	 * Inner class to avoid a hard-coded dependency on Java 8's {@link java.time.ZoneId}.
-	 */
-	private static class ZoneIdResolver {
-
-		public static Object resolveZoneId(HttpServletRequest request) {
-			TimeZone timeZone = RequestContextUtils.getTimeZone(request);
-			return (timeZone != null ? timeZone.toZoneId() : ZoneId.systemDefault());
-		}
-	}
-
 }