Integrate animal sniffer

Animal sniffer provides tools to assist verifying that classes
compiled with a newer JDK are compatible with an older JDK.

This integratesthe latest version of the tool (1.11) that
permits the use of custom annotations. Added @UsesJava7,
@UsesJava8 and @UsesSunHttpServer and annotated the few places
where we rely on a specific environment.

The verification process can be invoked by running the 'sniff'
task.

Issue: SPR-11604

polishing

build.gradle

@@ -30,6 +30,7 @@ configure(allprojects) { project ->
 	ext.tiles3Version        = "3.0.3"
 	ext.tomcatVersion        = "8.0.5"
 	ext.xstreamVersion       = "1.4.7"
+	ext.snifferVersion       = "1.11"
 
 	ext.gradleScriptDir   = "${rootProject.projectDir}/gradle"
 
@@ -38,6 +39,11 @@ configure(allprojects) { project ->
 	apply plugin: "test-source-set-dependencies"
 	apply from: "${gradleScriptDir}/ide.gradle"
 
+	configurations {
+		sniffer
+		javaApiSignature
+	}
+
 	compileJava.options*.compilerArgs = [
 		"-Xlint:serial", "-Xlint:varargs", "-Xlint:cast", "-Xlint:classfile",
 		"-Xlint:dep-ann", "-Xlint:divzero", "-Xlint:empty", "-Xlint:finally",
@@ -89,6 +95,47 @@ configure(allprojects) { project ->
 			exclude group:'org.hamcrest', module:'hamcrest-core'
 		}
 		testCompile("org.hamcrest:hamcrest-all:1.3")
+		testCompile("org.mockito:mockito-core:1.9.5")
+
+		sniffer("org.codehaus.mojo:animal-sniffer-ant-tasks:${snifferVersion}")
+		javaApiSignature("org.codehaus.mojo.signature:java16:1.1@signature") // As from Java6_18
+	}
+
+	task copyJavaApiSignature(type: Copy) {
+		ext.to = file("$buildDir/javaApiSignature/")
+		description "Copy the resolved Animal Sniffer signature dependency artifact to a known location and name"
+		from configurations.javaApiSignature
+		into to
+		rename '.*signature', 'javaApi.signature'
+	}
+
+	task sniff {
+		group = "Verification"
+		description = "Checks the Java API signatures"
+
+		dependsOn compileJava
+		dependsOn copyJavaApiSignature
+
+		inputs.dir sourceSets.main.output.classesDir
+		inputs.dir copyJavaApiSignature.to
+		outputs.upToDateWhen { true }
+		
+		doLast {
+			ant.taskdef(
+				name: 'animalSniffer',
+				classname: 'org.codehaus.mojo.animal_sniffer.ant.CheckSignatureTask',
+				classpath: configurations.sniffer.asPath
+			)
+
+			ant.animalSniffer(
+					signature: "$buildDir/javaApiSignature/javaApi.signature",
+					classpath: sourceSets.main.compileClasspath.asPath) {
+				path(path: sourceSets.main.output.classesDir)
+				annotation(className: "org.springframework.core.UsesJava7")
+				annotation(className: "org.springframework.core.UsesJava8")
+				annotation(className: "org.springframework.core.UsesSunHttpServer")
+			}
+		}
 	}
 
 	ext.javadocLinks = [

spring-beans/src/main/java/org/springframework/beans/propertyeditors/ZoneIdEditor.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -19,6 +19,8 @@ package org.springframework.beans.propertyeditors;
 import java.beans.PropertyEditorSupport;
 import java.time.ZoneId;
 
+import org.springframework.core.UsesJava8;
+
 /**
  * Editor for {@code java.time.ZoneId}, translating zone ID Strings into {@code ZoneId}
  * objects. Exposes the {@code TimeZone} ID as a text representation.
@@ -28,6 +30,7 @@ import java.time.ZoneId;
  * @see java.time.ZoneId
  * @see TimeZoneEditor
  */
+@UsesJava8
 public class ZoneIdEditor extends PropertyEditorSupport {
 
 	@Override

spring-context/src/main/java/org/springframework/format/datetime/joda/JodaTimeConverters.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.

spring-context/src/main/java/org/springframework/format/datetime/standard/DateTimeContext.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -24,6 +24,7 @@ import java.util.TimeZone;
 import org.springframework.context.i18n.LocaleContext;
 import org.springframework.context.i18n.LocaleContextHolder;
 import org.springframework.context.i18n.TimeZoneAwareLocaleContext;
+import org.springframework.core.UsesJava8;
 
 /**
  * A context that holds user-specific <code>java.time</code> (JSR-310) settings
@@ -34,6 +35,7 @@ import org.springframework.context.i18n.TimeZoneAwareLocaleContext;
  * @since 4.0
  * @see DateTimeContextHolder
  */
+@UsesJava8
 public class DateTimeContext {
 
 	private Chronology chronology;

spring-context/src/main/java/org/springframework/format/datetime/standard/DateTimeContextHolder.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -19,6 +19,7 @@ package org.springframework.format.datetime.standard;
 import java.time.format.DateTimeFormatter;
 import java.util.Locale;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.core.NamedThreadLocal;
 
 /**
@@ -27,6 +28,7 @@ import org.springframework.core.NamedThreadLocal;
  * @author Juergen Hoeller
  * @since 4.0
  */
+@UsesJava8
 public final class DateTimeContextHolder {
 
 	private static final ThreadLocal<DateTimeContext> dateTimeContextHolder =

spring-context/src/main/java/org/springframework/format/datetime/standard/DateTimeConverters.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -26,6 +26,7 @@ import java.time.chrono.ChronoZonedDateTime;
 import java.util.Calendar;
 import java.util.GregorianCalendar;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.converter.ConverterRegistry;
 import org.springframework.format.datetime.DateFormatterRegistrar;
@@ -42,6 +43,7 @@ import org.springframework.format.datetime.DateFormatterRegistrar;
  * @author Juergen Hoeller
  * @since 4.0.1
  */
+@UsesJava8
 final class DateTimeConverters {
 
 	/**
@@ -83,7 +85,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class LocalDateTimeToLocalDateConverter implements Converter<LocalDateTime, LocalDate> {
 
 		@Override
@@ -92,7 +94,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class LocalDateTimeToLocalTimeConverter implements Converter<LocalDateTime, LocalTime> {
 
 		@Override
@@ -101,7 +103,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class ZonedDateTimeToLocalDateConverter implements Converter<ZonedDateTime, LocalDate> {
 
 		@Override
@@ -110,7 +112,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class ZonedDateTimeToLocalTimeConverter implements Converter<ZonedDateTime, LocalTime> {
 
 		@Override
@@ -119,7 +121,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class ZonedDateTimeToLocalDateTimeConverter implements Converter<ZonedDateTime, LocalDateTime> {
 
 		@Override
@@ -128,7 +130,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class ZonedDateTimeToOffsetDateTimeConverter implements Converter<ZonedDateTime, OffsetDateTime> {
 
 		@Override
@@ -137,7 +139,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class ZonedDateTimeToInstantConverter implements Converter<ZonedDateTime, Instant> {
 
 		@Override
@@ -147,6 +149,7 @@ final class DateTimeConverters {
 		}
 	}
 
+	@UsesJava8
 	private static class OffsetDateTimeToLocalDateConverter implements Converter<OffsetDateTime, LocalDate> {
 
 		@Override
@@ -155,7 +158,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class OffsetDateTimeToLocalTimeConverter implements Converter<OffsetDateTime, LocalTime> {
 
 		@Override
@@ -164,7 +167,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class OffsetDateTimeToLocalDateTimeConverter implements Converter<OffsetDateTime, LocalDateTime> {
 
 		@Override
@@ -173,7 +176,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class OffsetDateTimeToZonedDateTimeConverter implements Converter<OffsetDateTime, ZonedDateTime> {
 
 		@Override
@@ -182,7 +185,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class OffsetDateTimeToInstantConverter implements Converter<OffsetDateTime, Instant> {
 
 		@Override
@@ -191,7 +194,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class CalendarToZonedDateTimeConverter implements Converter<Calendar, ZonedDateTime> {
 
 		@Override
@@ -200,7 +203,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class CalendarToOffsetDateTimeConverter implements Converter<Calendar, OffsetDateTime> {
 
 		@Override
@@ -209,7 +212,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class CalendarToLocalDateConverter implements Converter<Calendar, LocalDate> {
 
 		@Override
@@ -218,7 +221,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class CalendarToLocalTimeConverter implements Converter<Calendar, LocalTime> {
 
 		@Override
@@ -227,7 +230,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class CalendarToLocalDateTimeConverter implements Converter<Calendar, LocalDateTime> {
 
 		@Override
@@ -236,7 +239,7 @@ final class DateTimeConverters {
 		}
 	}
 
-
+	@UsesJava8
 	private static class CalendarToInstantConverter implements Converter<Calendar, Instant> {
 
 		@Override
@@ -247,6 +250,7 @@ final class DateTimeConverters {
 	}
 
 
+	@UsesJava8
 	private static class LongToInstantConverter implements Converter<Long, Instant> {
 
 		@Override
@@ -256,6 +260,7 @@ final class DateTimeConverters {
 	}
 
 
+	@UsesJava8
 	private static class InstantToLongConverter implements Converter<Instant, Long> {
 
 		@Override

spring-context/src/main/java/org/springframework/format/datetime/standard/DateTimeFormatterFactory.java

 /*
- * Copyright 2002-2012 the original author or authors.
+ * 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.
@@ -20,6 +20,7 @@ import java.time.format.DateTimeFormatter;
 import java.time.format.FormatStyle;
 import java.util.TimeZone;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.format.annotation.DateTimeFormat.ISO;
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
@@ -42,6 +43,7 @@ import org.springframework.util.StringUtils;
  * @see #setDateTimeStyle
  * @see DateTimeFormatterFactoryBean
  */
+@UsesJava8
 public class DateTimeFormatterFactory {
 
 	private String pattern;

spring-context/src/main/java/org/springframework/format/datetime/standard/DateTimeFormatterRegistrar.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -28,6 +28,7 @@ import java.time.format.FormatStyle;
 import java.util.HashMap;
 import java.util.Map;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.format.FormatterRegistrar;
 import org.springframework.format.FormatterRegistry;
 import org.springframework.format.annotation.DateTimeFormat.ISO;
@@ -46,6 +47,7 @@ import org.springframework.format.annotation.DateTimeFormat.ISO;
  * @see org.springframework.format.datetime.DateFormatterRegistrar
  * @see org.springframework.format.datetime.joda.DateTimeFormatterFactoryBean
  */
+@UsesJava8
 public class DateTimeFormatterRegistrar implements FormatterRegistrar {
 
 	private static enum Type {DATE, TIME, DATE_TIME}

spring-context/src/main/java/org/springframework/format/datetime/standard/InstantFormatter.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -20,6 +20,7 @@ import java.text.ParseException;
 import java.time.Instant;
 import java.util.Locale;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.format.Formatter;
 
 /**
@@ -31,6 +32,7 @@ import org.springframework.format.Formatter;
  * @since 4.0
  * @see java.time.Instant#parse
  */
+@UsesJava8
 public class InstantFormatter implements Formatter<Instant> {
 
 	@Override

spring-context/src/main/java/org/springframework/format/datetime/standard/TemporalAccessorParser.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -27,6 +27,7 @@ import java.time.format.DateTimeFormatter;
 import java.time.temporal.TemporalAccessor;
 import java.util.Locale;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.format.Parser;
 
 /**
@@ -43,6 +44,7 @@ import org.springframework.format.Parser;
  * @see java.time.OffsetDateTime#parse(CharSequence, java.time.format.DateTimeFormatter)
  * @see java.time.OffsetTime#parse(CharSequence, java.time.format.DateTimeFormatter)
  */
+@UsesJava8
 public final class TemporalAccessorParser implements Parser<TemporalAccessor> {
 
 	private final Class<? extends TemporalAccessor> temporalAccessorType;

spring-context/src/main/java/org/springframework/format/datetime/standard/TemporalAccessorPrinter.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -20,6 +20,7 @@ import java.time.format.DateTimeFormatter;
 import java.time.temporal.TemporalAccessor;
 import java.util.Locale;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.format.Printer;
 
 /**
@@ -31,6 +32,7 @@ import org.springframework.format.Printer;
  * @see DateTimeContextHolder#getFormatter
  * @see java.time.format.DateTimeFormatter#format(java.time.temporal.TemporalAccessor)
  */
+@UsesJava8
 public final class TemporalAccessorPrinter implements Printer<TemporalAccessor> {
 
 	private final DateTimeFormatter formatter;

spring-context/src/main/java/org/springframework/remoting/support/SimpleHttpServerFactoryBean.java

 /*
- * Copyright 2002-2012 the original author or authors.
+ * 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.
@@ -33,6 +33,7 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.factory.DisposableBean;
 import org.springframework.beans.factory.FactoryBean;
 import org.springframework.beans.factory.InitializingBean;
+import org.springframework.core.UsesSunHttpServer;
 
 /**
  * {@link org.springframework.beans.factory.FactoryBean} that creates a simple
@@ -51,6 +52,7 @@ import org.springframework.beans.factory.InitializingBean;
  * @see #setPort
  * @see #setContexts
  */
+@UsesSunHttpServer
 public class SimpleHttpServerFactoryBean implements FactoryBean<HttpServer>, InitializingBean, DisposableBean {
 
 	protected final Log logger = LogFactory.getLog(getClass());

spring-context/src/main/java/org/springframework/scheduling/concurrent/ForkJoinPoolFactoryBean.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -22,6 +22,7 @@ import java.util.concurrent.TimeUnit;
 import org.springframework.beans.factory.DisposableBean;
 import org.springframework.beans.factory.FactoryBean;
 import org.springframework.beans.factory.InitializingBean;
+import org.springframework.core.UsesJava7;
 
 /**
  * A Spring {@link FactoryBean} that builds and exposes a preconfigured {@link ForkJoinPool}.
@@ -37,6 +38,7 @@ import org.springframework.beans.factory.InitializingBean;
  * @author Juergen Hoeller
  * @since 3.1
  */
+@UsesJava7
 public class ForkJoinPoolFactoryBean implements FactoryBean<ForkJoinPool>, InitializingBean, DisposableBean {
 
 	private boolean commonPool = false;

spring-core/src/main/java/org/springframework/core/StandardReflectionParameterNameDiscoverer.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -28,6 +28,7 @@ import java.lang.reflect.Parameter;
  * @since 4.0
  * @see java.lang.reflect.Parameter#getName()
  */
+@UsesJava8
 public class StandardReflectionParameterNameDiscoverer implements ParameterNameDiscoverer {
 
 	@Override

spring-core/src/main/java/org/springframework/core/UsesJava7.java

+/*
+ * 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.core;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+/**
+ * Indicate that the annotated element uses Java7 specific constructs
+ * and therefore requires a Java7 environment.
+ *
+ * @author Stephane Nicoll
+ */
+@Retention(java.lang.annotation.RetentionPolicy.CLASS)
+@Documented
+@Target({ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.TYPE})
+public @interface UsesJava7 {
+
+}

spring-core/src/main/java/org/springframework/core/UsesJava8.java

+/*
+ * 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.core;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+/**
+ * Indicate that the annotated element uses Java8 specific constructs
+ * and therefore requires a Java8 environment.
+ *
+ * @author Stephane Nicoll
+ * @since 4.1
+ */
+@Retention(java.lang.annotation.RetentionPolicy.CLASS)
+@Documented
+@Target({ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.TYPE})
+public @interface UsesJava8 {
+
+}

spring-core/src/main/java/org/springframework/core/UsesSunHttpServer.java

+/*
+ * 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.core;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+/**
+ * Indicate that the annotated element uses the Http Server available in
+ * {@code com.sun.*} classes, which is only available on a Sun/Oracle JVM.
+ *
+ * @author Stephane Nicoll
+ * @since 4.1
+ */
+@Retention(java.lang.annotation.RetentionPolicy.CLASS)
+@Documented
+@Target({ElementType.METHOD, ElementType.CONSTRUCTOR, ElementType.TYPE})
+public @interface UsesSunHttpServer {
+
+}

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

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -19,6 +19,7 @@ package org.springframework.core.convert.support;
 import java.time.ZoneId;
 import java.util.TimeZone;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.core.convert.converter.Converter;
 
 /**
@@ -34,6 +35,7 @@ import org.springframework.core.convert.converter.Converter;
  * @since 4.0
  * @see TimeZone#getTimeZone(java.time.ZoneId)
  */
+@UsesJava8
 final class ZoneIdToTimeZoneConverter implements Converter<ZoneId, TimeZone> {
 
 	@Override

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

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -20,6 +20,7 @@ import java.time.ZonedDateTime;
 import java.util.Calendar;
 import java.util.GregorianCalendar;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.core.convert.converter.Converter;
 
 /**
@@ -35,6 +36,7 @@ import org.springframework.core.convert.converter.Converter;
  * @since 4.0.1
  * @see java.util.GregorianCalendar#from(java.time.ZonedDateTime)
  */
+@UsesJava8
 final class ZonedDateTimeToCalendarConverter implements Converter<ZonedDateTime, Calendar> {
 
 	@Override

spring-core/src/main/java/org/springframework/core/io/PathResource.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -28,6 +28,7 @@ import java.nio.file.OpenOption;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.util.Assert;
 
 /**
@@ -39,6 +40,7 @@ import org.springframework.util.Assert;
  * @since 4.0
  * @see java.nio.file.Path
  */
+@UsesJava8
 public class PathResource extends AbstractResource implements WritableResource {
 
 	private final Path path;

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

@@ -22,6 +22,7 @@ import javax.sql.rowset.CachedRowSet;
 import javax.sql.rowset.RowSetFactory;
 import javax.sql.rowset.RowSetProvider;
 
+import org.springframework.core.UsesJava7;
 import org.springframework.core.JdkVersion;
 import org.springframework.jdbc.support.rowset.ResultSetWrappingSqlRowSet;
 import org.springframework.jdbc.support.rowset.SqlRowSet;
@@ -109,6 +110,7 @@ public class SqlRowSetResultSetExtractor implements ResultSetExtractor<SqlRowSet
 	/**
 	 * Inner class to avoid a hard dependency on JDBC 4.1 RowSetProvider class.
 	 */
+	@UsesJava7
 	private static class StandardCachedRowSetFactory implements CachedRowSetFactory {
 
 		private final RowSetFactory rowSetFactory;

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

@@ -34,6 +34,7 @@ import javax.sql.DataSource;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.springframework.core.UsesJava7;
 import org.springframework.jdbc.CannotGetJdbcConnectionException;
 import org.springframework.jdbc.datasource.DataSourceUtils;
 import org.springframework.util.ClassUtils;
@@ -134,6 +135,7 @@ public abstract class JdbcUtils {
 	 * @return the value object
 	 * @throws SQLException if thrown by the JDBC API
 	 */
+	@UsesJava7 // guard use of JDBC 4.1 (safe with 1.6)
 	public static Object getResultSetValue(ResultSet rs, int index, Class<?> requiredType) throws SQLException {
 		if (requiredType == null) {
 			return getResultSetValue(rs, index);

spring-web/src/main/java/org/springframework/remoting/caucho/SimpleBurlapServiceExporter.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -22,6 +22,7 @@ import java.io.IOException;
 import com.sun.net.httpserver.HttpExchange;
 import com.sun.net.httpserver.HttpHandler;
 
+import org.springframework.core.UsesSunHttpServer;
 import org.springframework.util.FileCopyUtils;
 
 /**
@@ -48,6 +49,7 @@ import org.springframework.util.FileCopyUtils;
  * and is effectively retired (in contrast to its sibling Hessian)
  */
 @Deprecated
+@UsesSunHttpServer
 public class SimpleBurlapServiceExporter extends BurlapExporter implements HttpHandler {
 
 	/**

spring-web/src/main/java/org/springframework/remoting/caucho/SimpleHessianServiceExporter.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -22,6 +22,7 @@ import java.io.IOException;
 import com.sun.net.httpserver.HttpExchange;
 import com.sun.net.httpserver.HttpHandler;
 
+import org.springframework.core.UsesSunHttpServer;
 import org.springframework.util.FileCopyUtils;
 
 /**
@@ -44,6 +45,7 @@ import org.springframework.util.FileCopyUtils;
  * @see org.springframework.remoting.caucho.HessianProxyFactoryBean
  * @see org.springframework.remoting.httpinvoker.SimpleHttpInvokerServiceExporter
  */
+@UsesSunHttpServer
 public class SimpleHessianServiceExporter extends HessianExporter implements HttpHandler {
 
 	/**

spring-web/src/main/java/org/springframework/remoting/httpinvoker/SimpleHttpInvokerServiceExporter.java

 /*
- * Copyright 2002-2012 the original author or authors.
+ * 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.
@@ -25,6 +25,7 @@ import java.io.OutputStream;
 import com.sun.net.httpserver.HttpExchange;
 import com.sun.net.httpserver.HttpHandler;
 
+import org.springframework.core.UsesSunHttpServer;
 import org.springframework.remoting.rmi.RemoteInvocationSerializingExporter;
 import org.springframework.remoting.support.RemoteInvocation;
 import org.springframework.remoting.support.RemoteInvocationResult;
@@ -51,6 +52,7 @@ import org.springframework.remoting.support.RemoteInvocationResult;
  * @see org.springframework.remoting.caucho.SimpleHessianServiceExporter
  * @see org.springframework.remoting.caucho.SimpleBurlapServiceExporter
  */
+@UsesSunHttpServer
 public class SimpleHttpInvokerServiceExporter extends RemoteInvocationSerializingExporter
 		implements HttpHandler {
 

spring-web/src/main/java/org/springframework/remoting/jaxws/AbstractJaxWsServiceExporter.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -34,6 +34,7 @@ import org.springframework.beans.factory.DisposableBean;
 import org.springframework.beans.factory.InitializingBean;
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.config.ConfigurableBeanFactory;
+import org.springframework.core.UsesJava7;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 
@@ -189,6 +190,7 @@ public abstract class AbstractJaxWsServiceExporter implements BeanFactoryAware,
 	 * @see Endpoint#create(Object)
 	 * @see Endpoint#create(String, Object)
 	 */
+	@UsesJava7 // Endpoint#create with WebServiceFeature[]
 	protected Endpoint createEndpoint(Object bean) {
 		if (this.endpointFeatures != null || this.webServiceFeatures != null) {
 			WebServiceFeature[] endpointFeaturesToUse = this.endpointFeatures;

spring-web/src/main/java/org/springframework/remoting/jaxws/LocalJaxWsServiceFactory.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -24,6 +24,7 @@ import javax.xml.ws.Service;
 import javax.xml.ws.WebServiceFeature;
 import javax.xml.ws.handler.HandlerResolver;
 
+import org.springframework.core.UsesJava7;
 import org.springframework.core.io.Resource;
 import org.springframework.util.Assert;
 
@@ -146,6 +147,7 @@ public class LocalJaxWsServiceFactory {
 	 * @see #setServiceName
 	 * @see #setWsdlDocumentUrl
 	 */
+	@UsesJava7 // Service#create with WebServiceFeature[]
 	public Service createJaxWsService() {
 		Assert.notNull(this.serviceName, "No service name specified");
 		Service service;

spring-web/src/main/java/org/springframework/remoting/jaxws/SimpleHttpServerJaxWsServiceExporter.java

 /*
- * Copyright 2002-2009 the original author or authors.
+ * 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.
@@ -28,6 +28,7 @@ import com.sun.net.httpserver.HttpContext;
 import com.sun.net.httpserver.HttpServer;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.springframework.core.UsesSunHttpServer;
 
 /**
  * Simple exporter for JAX-WS services, autodetecting annotated service beans
@@ -46,6 +47,7 @@ import org.apache.commons.logging.LogFactory;
  * @see javax.xml.ws.Endpoint#publish(Object)
  * @see SimpleJaxWsServiceExporter
  */
+@UsesSunHttpServer
 public class SimpleHttpServerJaxWsServiceExporter extends AbstractJaxWsServiceExporter {
 
 	protected final Log logger = LogFactory.getLog(getClass());

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

@@ -27,6 +27,7 @@ import javax.servlet.ServletRequest;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpSession;
 
+import org.springframework.core.UsesJava8;
 import org.springframework.core.MethodParameter;
 import org.springframework.http.HttpMethod;
 import org.springframework.web.bind.support.WebDataBinderFactory;
@@ -133,6 +134,7 @@ public class ServletRequestMethodArgumentResolver implements HandlerMethodArgume
 	/**
 	 * Inner class to avoid a hard-coded dependency on Java 8's {@link java.time.ZoneId}.
 	 */
+	@UsesJava8
 	private static class ZoneIdResolver {
 
 		public static Object resolveZoneId(HttpServletRequest request) {

spring-websocket/src/main/java/org/springframework/web/socket/client/standard/StandardWebSocketClient.java

 /*
- * Copyright 2002-2013 the original author or authors.
+ * 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.
@@ -33,6 +33,7 @@ import javax.websocket.Extension;
 import javax.websocket.HandshakeResponse;
 import javax.websocket.WebSocketContainer;
 
+import org.springframework.core.UsesJava7;
 import org.springframework.core.task.AsyncListenableTaskExecutor;
 import org.springframework.core.task.TaskExecutor;
 import org.springframework.http.HttpHeaders;
@@ -145,6 +146,7 @@ public class StandardWebSocketClient extends AbstractWebSocketClient {
 		return result;
 	}
 
+	@UsesJava7
 	private InetAddress getLocalHost() {
 		try {
 			return InetAddress.getLocalHost();