Cache key classes implement Comparable and consistently provide a toString representation

Issue: SPR-14017

spring-aop/src/main/java/org/springframework/aop/framework/AdvisedSupport.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.
@@ -586,7 +586,7 @@ public class AdvisedSupport extends ProxyConfig implements Advised {
 	 * Simple wrapper class around a Method. Used as the key when
 	 * caching methods, for efficient equals and hashCode comparisons.
 	 */
-	private static class MethodCacheKey {
+	private static final class MethodCacheKey implements Comparable<MethodCacheKey> {
 
 		private final Method method;
 
@@ -599,17 +599,28 @@ public class AdvisedSupport extends ProxyConfig implements Advised {
 
 		@Override
 		public boolean equals(Object other) {
-			if (other == this) {
+			return (this == other || (other instanceof MethodCacheKey &&
-				return true;
+					this.method == ((MethodCacheKey) other).method));
-			}
-			MethodCacheKey otherKey = (MethodCacheKey) other;
-			return (this.method == otherKey.method);
 		}
 
 		@Override
 		public int hashCode() {
 			return this.hashCode;
 		}
+
+		@Override
+		public String toString() {
+			return this.method.toString();
+		}
+
+		@Override
+		public int compareTo(MethodCacheKey other) {
+			int result = this.method.getName().compareTo(other.method.getName());
+			if (result == 0) {
+				result = this.method.toString().compareTo(other.method.toString());
+			}
+			return result;
+		}
 	}
 
 }

spring-context/src/main/java/org/springframework/cache/annotation/SpringCacheAnnotationParser.java

@@ -101,6 +101,7 @@ public class SpringCacheAnnotationParser implements CacheAnnotationParser, Seria
 	CacheableOperation parseCacheableAnnotation(AnnotatedElement ae, DefaultCacheConfig defaultConfig, Cacheable cacheable) {
 		CacheableOperation.Builder builder = new CacheableOperation.Builder();
 
+		builder.setName(ae.toString());
 		builder.setCacheNames(cacheable.cacheNames());
 		builder.setCondition(cacheable.condition());
 		builder.setUnless(cacheable.unless());
@@ -109,7 +110,6 @@ public class SpringCacheAnnotationParser implements CacheAnnotationParser, Seria
 		builder.setCacheManager(cacheable.cacheManager());
 		builder.setCacheResolver(cacheable.cacheResolver());
 		builder.setSync(cacheable.sync());
-		builder.setName(ae.toString());
 
 		defaultConfig.applyDefault(builder);
 		CacheableOperation op = builder.build();
@@ -121,6 +121,7 @@ public class SpringCacheAnnotationParser implements CacheAnnotationParser, Seria
 	CacheEvictOperation parseEvictAnnotation(AnnotatedElement ae, DefaultCacheConfig defaultConfig, CacheEvict cacheEvict) {
 		CacheEvictOperation.Builder builder = new CacheEvictOperation.Builder();
 
+		builder.setName(ae.toString());
 		builder.setCacheNames(cacheEvict.cacheNames());
 		builder.setCondition(cacheEvict.condition());
 		builder.setKey(cacheEvict.key());
@@ -129,7 +130,6 @@ public class SpringCacheAnnotationParser implements CacheAnnotationParser, Seria
 		builder.setCacheResolver(cacheEvict.cacheResolver());
 		builder.setCacheWide(cacheEvict.allEntries());
 		builder.setBeforeInvocation(cacheEvict.beforeInvocation());
-		builder.setName(ae.toString());
 
 		defaultConfig.applyDefault(builder);
 		CacheEvictOperation op = builder.build();
@@ -141,6 +141,7 @@ public class SpringCacheAnnotationParser implements CacheAnnotationParser, Seria
 	CacheOperation parsePutAnnotation(AnnotatedElement ae, DefaultCacheConfig defaultConfig, CachePut cachePut) {
 		CachePutOperation.Builder builder = new CachePutOperation.Builder();
 
+		builder.setName(ae.toString());
 		builder.setCacheNames(cachePut.cacheNames());
 		builder.setCondition(cachePut.condition());
 		builder.setUnless(cachePut.unless());
@@ -148,7 +149,6 @@ public class SpringCacheAnnotationParser implements CacheAnnotationParser, Seria
 		builder.setKeyGenerator(cachePut.keyGenerator());
 		builder.setCacheManager(cachePut.cacheManager());
 		builder.setCacheResolver(cachePut.cacheResolver());
-		builder.setName(ae.toString());
 
 		defaultConfig.applyDefault(builder);
 		CachePutOperation op = builder.build();

spring-context/src/main/java/org/springframework/cache/interceptor/CacheAspectSupport.java

@@ -746,7 +746,7 @@ public abstract class CacheAspectSupport extends AbstractCacheInvoker
 	}
 
 
-	private static class CacheOperationCacheKey {
+	private static final class CacheOperationCacheKey implements Comparable<CacheOperationCacheKey> {
 
 		private final CacheOperation cacheOperation;
 
@@ -774,6 +774,20 @@ public abstract class CacheAspectSupport extends AbstractCacheInvoker
 		public int hashCode() {
 			return (this.cacheOperation.hashCode() * 31 + this.methodCacheKey.hashCode());
 		}
+
+		@Override
+		public String toString() {
+			return this.cacheOperation + " on " + this.methodCacheKey;
+		}
+
+		@Override
+		public int compareTo(CacheOperationCacheKey other) {
+			int result = this.cacheOperation.getName().compareTo(other.cacheOperation.getName());
+			if (result == 0) {
+				result = this.methodCacheKey.compareTo(other.methodCacheKey);
+			}
+			return result;
+		}
 	}
 
 }

spring-context/src/main/java/org/springframework/cache/interceptor/CacheEvictOperation.java

@@ -29,6 +29,13 @@ public class CacheEvictOperation extends CacheOperation {
 
 	private final boolean beforeInvocation;
 
+
+	public CacheEvictOperation(CacheEvictOperation.Builder b) {
+		super(b);
+		this.cacheWide = b.cacheWide;
+		this.beforeInvocation = b.beforeInvocation;
+	}
+
 	public boolean isCacheWide() {
 		return this.cacheWide;
 	}
@@ -37,12 +44,10 @@ public class CacheEvictOperation extends CacheOperation {
 		return this.beforeInvocation;
 	}
 
-	public CacheEvictOperation(CacheEvictOperation.Builder b) {
-		super(b);
-		this.cacheWide = b.cacheWide;
-		this.beforeInvocation = b.beforeInvocation;
-	}
 
+	/**
+	 * @since 4.3
+	 */
 	public static class Builder extends CacheOperation.Builder {
 
 		private boolean cacheWide = false;
@@ -71,4 +76,5 @@ public class CacheEvictOperation extends CacheOperation {
 			return new CacheEvictOperation(this);
 		}
 	}
+
 }

spring-context/src/main/java/org/springframework/cache/interceptor/CacheOperation.java

@@ -48,6 +48,7 @@ public abstract class CacheOperation implements BasicOperation {
 
 	private final String toString;
 
+
 	protected CacheOperation(Builder b) {
 		this.name = b.name;
 		this.cacheNames = b.cacheNames;
@@ -59,11 +60,11 @@ public abstract class CacheOperation implements BasicOperation {
 		this.toString = b.getOperationDescription().toString();
 	}
 
+
 	public String getName() {
 		return this.name;
 	}
 
-
 	@Override
 	public Set<String> getCacheNames() {
 		return this.cacheNames;
@@ -96,7 +97,6 @@ public abstract class CacheOperation implements BasicOperation {
 
 	/**
 	 * This implementation compares the {@code toString()} results.
-	 *
 	 * @see #toString()
 	 */
 	@Override
@@ -106,7 +106,6 @@ public abstract class CacheOperation implements BasicOperation {
 
 	/**
 	 * This implementation returns {@code toString()}'s hash code.
-	 *
 	 * @see #toString()
 	 */
 	@Override
@@ -118,7 +117,6 @@ public abstract class CacheOperation implements BasicOperation {
 	 * Return an identifying description for this cache operation.
 	 * <p>Returned value is produced by calling {@link Builder#getOperationDescription()}
 	 * during object construction. This method is used in {#hashCode} and {#equals}.
-	 *
 	 * @see Builder#getOperationDescription()
 	 */
 	@Override
@@ -126,6 +124,10 @@ public abstract class CacheOperation implements BasicOperation {
 		return this.toString;
 	}
 
+
+	/**
+	 * @since 4.3
+	 */
 	public abstract static class Builder {
 
 		private String name = "";

spring-context/src/main/java/org/springframework/cache/interceptor/CachePutOperation.java

@@ -28,6 +28,7 @@ public class CachePutOperation extends CacheOperation {
 
 	private final String unless;
 
+
 	public CachePutOperation(CachePutOperation.Builder b) {
 		super(b);
 		this.unless = b.unless;
@@ -37,6 +38,10 @@ public class CachePutOperation extends CacheOperation {
 		return this.unless;
 	}
 
+
+	/**
+	 * @since 4.3
+	 */
 	public static class Builder extends CacheOperation.Builder {
 
 		private String unless;
@@ -58,4 +63,5 @@ public class CachePutOperation extends CacheOperation {
 			return new CachePutOperation(this);
 		}
 	}
+
 }

spring-context/src/main/java/org/springframework/cache/interceptor/CacheableOperation.java

@@ -30,6 +30,7 @@ public class CacheableOperation extends CacheOperation {
 
 	private boolean sync;
 
+
 	public CacheableOperation(CacheableOperation.Builder b) {
 		super(b);
 		this.unless = b.unless;
@@ -76,4 +77,5 @@ public class CacheableOperation extends CacheOperation {
 			return new CacheableOperation(this);
 		}
 	}
+
 }

spring-context/src/main/java/org/springframework/context/event/AbstractApplicationEventMulticaster.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.
@@ -286,7 +286,7 @@ public abstract class AbstractApplicationEventMulticaster
 	/**
 	 * Cache key for ListenerRetrievers, based on event type and source type.
 	 */
-	private static class ListenerCacheKey {
+	private static final class ListenerCacheKey implements Comparable<ListenerCacheKey> {
 
 		private final ResolvableType eventType;
 
@@ -311,6 +311,23 @@ public abstract class AbstractApplicationEventMulticaster
 		public int hashCode() {
 			return (ObjectUtils.nullSafeHashCode(this.eventType) * 29 + ObjectUtils.nullSafeHashCode(this.sourceType));
 		}
+
+		@Override
+		public String toString() {
+			return "ListenerCacheKey [eventType = " + this.eventType + ", sourceType = " + this.sourceType.getName() + "]";
+		}
+
+		@Override
+		public int compareTo(ListenerCacheKey other) {
+			int result = 0;
+			if (this.eventType != null) {
+				result = this.eventType.toString().compareTo(other.eventType.toString());
+			}
+			if (result == 0 && this.sourceType != null) {
+				result = this.sourceType.getName().compareTo(other.sourceType.getName());
+			}
+			return result;
+		}
 	}
 
 

spring-context/src/main/java/org/springframework/context/expression/AnnotatedElementKey.java

@@ -30,7 +30,7 @@ import org.springframework.util.ObjectUtils;
  * @since 4.2
  * @see CachedExpressionEvaluator
  */
-public final class AnnotatedElementKey {
+public final class AnnotatedElementKey implements Comparable<AnnotatedElementKey> {
 
 	private final AnnotatedElement element;
 
@@ -66,4 +66,18 @@ public final class AnnotatedElementKey {
 		return this.element.hashCode() + (this.targetClass != null ? this.targetClass.hashCode() * 29 : 0);
 	}
 
+	@Override
+	public String toString() {
+		return this.element + (this.targetClass != null ? " on " + this.targetClass : "");
+	}
+
+	@Override
+	public int compareTo(AnnotatedElementKey other) {
+		int result = this.element.toString().compareTo(other.element.toString());
+		if (result == 0 && this.targetClass != null) {
+			result = this.targetClass.getName().compareTo(other.targetClass.getName());
+		}
+		return result;
+	}
+
 }

spring-context/src/main/java/org/springframework/jmx/access/MBeanClientInterceptor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 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.
@@ -63,6 +63,7 @@ import org.springframework.jmx.support.JmxUtils;
 import org.springframework.jmx.support.ObjectNameManager;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.ReflectionUtils;
+import org.springframework.util.StringUtils;
 
 /**
  * {@link org.aopalliance.intercept.MethodInterceptor} that routes calls to an
@@ -609,7 +610,7 @@ public class MBeanClientInterceptor
 	 * Simple wrapper class around a method name and its signature.
 	 * Used as the key when caching methods.
 	 */
-	private static class MethodCacheKey {
+	private static final class MethodCacheKey implements Comparable<MethodCacheKey> {
 
 		private final String name;
 
@@ -628,7 +629,7 @@ public class MBeanClientInterceptor
 
 		@Override
 		public boolean equals(Object other) {
-			if (other == this) {
+			if (this == other) {
 				return true;
 			}
 			MethodCacheKey otherKey = (MethodCacheKey) other;
@@ -639,6 +640,32 @@ public class MBeanClientInterceptor
 		public int hashCode() {
 			return this.name.hashCode();
 		}
+
+		@Override
+		public String toString() {
+			return this.name + "(" + StringUtils.arrayToCommaDelimitedString(this.parameterTypes) + ")";
+		}
+
+		@Override
+		public int compareTo(MethodCacheKey other) {
+			int result = this.name.compareTo(other.name);
+			if (result != 0) {
+				return result;
+			}
+			if (this.parameterTypes.length < other.parameterTypes.length) {
+				return -1;
+			}
+			if (this.parameterTypes.length > other.parameterTypes.length) {
+				return 1;
+			}
+			for (int i = 0; i < this.parameterTypes.length; i++) {
+				result = this.parameterTypes[i].getName().compareTo(other.parameterTypes[i].getName());
+				if (result != 0) {
+					return result;
+				}
+			}
+			return 0;
+		}
 	}
 
 }

spring-core/src/main/java/org/springframework/core/annotation/AnnotationUtils.java

@@ -1802,7 +1802,7 @@ public abstract class AnnotationUtils {
 	/**
 	 * Cache key for the AnnotatedElement cache.
 	 */
-	private static class AnnotationCacheKey {
+	private static final class AnnotationCacheKey implements Comparable<AnnotationCacheKey> {
 
 		private final AnnotatedElement element;
 
@@ -1829,6 +1829,20 @@ public abstract class AnnotationUtils {
 		public int hashCode() {
 			return (this.element.hashCode() * 29 + this.annotationType.hashCode());
 		}
+
+		@Override
+		public String toString() {
+			return "@" + this.annotationType + " on " + this.element;
+		}
+
+		@Override
+		public int compareTo(AnnotationCacheKey other) {
+			int result = this.element.toString().compareTo(other.element.toString());
+			if (result == 0) {
+				result = this.annotationType.getName().compareTo(other.annotationType.getName());
+			}
+			return result;
+		}
 	}
 
 

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

@@ -435,7 +435,7 @@ public class GenericConversionService implements ConfigurableConversionService {
 	/**
 	 * Key for use with the converter cache.
 	 */
-	private static final class ConverterCacheKey {
+	private static final class ConverterCacheKey implements Comparable<ConverterCacheKey> {
 
 		private final TypeDescriptor sourceType;
 
@@ -470,6 +470,17 @@ public class GenericConversionService implements ConfigurableConversionService {
 			return ("ConverterCacheKey [sourceType = " + this.sourceType +
 					", targetType = " + this.targetType + "]");
 		}
+
+		@Override
+		public int compareTo(ConverterCacheKey other) {
+			int result = this.sourceType.getResolvableType().toString().compareTo(
+					other.sourceType.getResolvableType().toString());
+			if (result == 0) {
+				result = this.targetType.getResolvableType().toString().compareTo(
+						other.targetType.getResolvableType().toString());
+			}
+			return result;
+		}
 	}
 
 

spring-expression/src/main/java/org/springframework/expression/spel/support/ReflectivePropertyAccessor.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.
@@ -33,7 +33,6 @@ import org.springframework.asm.MethodVisitor;
 import org.springframework.core.MethodParameter;
 import org.springframework.core.convert.Property;
 import org.springframework.core.convert.TypeDescriptor;
-import org.springframework.core.style.ToStringCreator;
 import org.springframework.expression.AccessException;
 import org.springframework.expression.EvaluationContext;
 import org.springframework.expression.EvaluationException;
@@ -70,11 +69,14 @@ public class ReflectivePropertyAccessor implements PropertyAccessor {
 	}
 
 
-	private final Map<CacheKey, InvokerPair> readerCache = new ConcurrentHashMap<CacheKey, InvokerPair>(64);
+	private final Map<PropertyCacheKey, InvokerPair> readerCache =
+			new ConcurrentHashMap<PropertyCacheKey, InvokerPair>(64);
 
-	private final Map<CacheKey, Member> writerCache = new ConcurrentHashMap<CacheKey, Member>(64);
+	private final Map<PropertyCacheKey, Member> writerCache =
+			new ConcurrentHashMap<PropertyCacheKey, Member>(64);
 
-	private final Map<CacheKey, TypeDescriptor> typeDescriptorCache = new ConcurrentHashMap<CacheKey, TypeDescriptor>(64);
+	private final Map<PropertyCacheKey, TypeDescriptor> typeDescriptorCache =
+			new ConcurrentHashMap<PropertyCacheKey, TypeDescriptor>(64);
 
 	private InvokerPair lastReadInvokerPair;
 
@@ -96,7 +98,7 @@ public class ReflectivePropertyAccessor implements PropertyAccessor {
 		if (type.isArray() && name.equals("length")) {
 			return true;
 		}
-		CacheKey cacheKey = new CacheKey(type, name, target instanceof Class);
+		PropertyCacheKey cacheKey = new PropertyCacheKey(type, name, target instanceof Class);
 		if (this.readerCache.containsKey(cacheKey)) {
 			return true;
 		}
@@ -140,7 +142,7 @@ public class ReflectivePropertyAccessor implements PropertyAccessor {
 			return new TypedValue(Array.getLength(target));
 		}
 
-		CacheKey cacheKey = new CacheKey(type, name, target instanceof Class);
+		PropertyCacheKey cacheKey = new PropertyCacheKey(type, name, target instanceof Class);
 		InvokerPair invoker = this.readerCache.get(cacheKey);
 		lastReadInvokerPair = invoker;
 
@@ -202,7 +204,7 @@ public class ReflectivePropertyAccessor implements PropertyAccessor {
 			return false;
 		}
 		Class<?> type = (target instanceof Class ? (Class<?>) target : target.getClass());
-		CacheKey cacheKey = new CacheKey(type, name, target instanceof Class);
+		PropertyCacheKey cacheKey = new PropertyCacheKey(type, name, target instanceof Class);
 		if (this.writerCache.containsKey(cacheKey)) {
 			return true;
 		}
@@ -244,7 +246,7 @@ public class ReflectivePropertyAccessor implements PropertyAccessor {
 				throw new AccessException("Type conversion failure", evaluationException);
 			}
 		}
-		CacheKey cacheKey = new CacheKey(type, name, target instanceof Class);
+		PropertyCacheKey cacheKey = new PropertyCacheKey(type, name, target instanceof Class);
 		Member cachedMember = this.writerCache.get(cacheKey);
 
 		if (cachedMember == null || cachedMember instanceof Method) {
@@ -301,7 +303,7 @@ public class ReflectivePropertyAccessor implements PropertyAccessor {
 		if (type.isArray() && name.equals("length")) {
 			return TypeDescriptor.valueOf(Integer.TYPE);
 		}
-		CacheKey cacheKey = new CacheKey(type, name, target instanceof Class);
+		PropertyCacheKey cacheKey = new PropertyCacheKey(type, name, target instanceof Class);
 		TypeDescriptor typeDescriptor = this.typeDescriptorCache.get(cacheKey);
 		if (typeDescriptor == null) {
 			// attempt to populate the cache entry
@@ -466,7 +468,7 @@ public class ReflectivePropertyAccessor implements PropertyAccessor {
 			return this;
 		}
 
-		CacheKey cacheKey = new CacheKey(type, name, target instanceof Class);
+		PropertyCacheKey cacheKey = new PropertyCacheKey(type, name, target instanceof Class);
 		InvokerPair invocationTarget = this.readerCache.get(cacheKey);
 
 		if (invocationTarget == null || invocationTarget.member instanceof Method) {
@@ -520,17 +522,17 @@ public class ReflectivePropertyAccessor implements PropertyAccessor {
 	}
 
 
-	private static class CacheKey {
+	private static final class PropertyCacheKey implements Comparable<PropertyCacheKey> {
 
 		private final Class<?> clazz;
 
-		private final String name;
+		private final String property;
 
 		private boolean targetIsClass;
 
-		public CacheKey(Class<?> clazz, String name, boolean targetIsClass) {
+		public PropertyCacheKey(Class<?> clazz, String name, boolean targetIsClass) {
 			this.clazz = clazz;
-			this.name = name;
+			this.property = name;
 			this.targetIsClass = targetIsClass;
 		}
 
@@ -539,23 +541,32 @@ public class ReflectivePropertyAccessor implements PropertyAccessor {
 			if (this == other) {
 				return true;
 			}
-			if (!(other instanceof CacheKey)) {
+			if (!(other instanceof PropertyCacheKey)) {
 				return false;
 			}
-			CacheKey otherKey = (CacheKey) other;
+			PropertyCacheKey otherKey = (PropertyCacheKey) other;
-			return (this.clazz.equals(otherKey.clazz) && this.name.equals(otherKey.name) &&
+			return (this.clazz == otherKey.clazz && this.property.equals(otherKey.property) &&
 					this.targetIsClass == otherKey.targetIsClass);
 		}
 
 		@Override
 		public int hashCode() {
-			return (this.clazz.hashCode() * 29 + this.name.hashCode());
+			return (this.clazz.hashCode() * 29 + this.property.hashCode());
 		}
 
 		@Override
 		public String toString() {
-			return new ToStringCreator(this).append("clazz", this.clazz).append("name",
+			return "CacheKey [clazz=" + this.clazz.getName() + ", property=" + this.property + ", " +
-					this.name).append("targetIsClass", this.targetIsClass).toString();
+					this.property + ", targetIsClass=" + this.targetIsClass + "]";
+		}
+
+		@Override
+		public int compareTo(PropertyCacheKey other) {
+			int result = this.clazz.getName().compareTo(other.clazz.getName());
+			if (result == 0) {
+				result = this.property.compareTo(other.property);
+			}
+			return result;
 		}
 	}
 

spring-jms/src/main/java/org/springframework/jms/connection/CachingConnectionFactory.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.
@@ -509,7 +509,7 @@ public class CachingConnectionFactory extends SingleConnectionFactory {
 	 * Simple wrapper class around a Destination reference.
 	 * Used as the cache key when caching MessageProducer objects.
 	 */
-	private static class DestinationCacheKey {
+	private static class DestinationCacheKey implements Comparable<DestinationCacheKey> {
 
 		private final Destination destination;
 
@@ -537,7 +537,7 @@ public class CachingConnectionFactory extends SingleConnectionFactory {
 		public boolean equals(Object other) {
 			// Effectively checking object equality as well as toString equality.
 			// On WebSphere MQ, Destination objects do not implement equals...
-			return (other == this || destinationEquals((DestinationCacheKey) other));
+			return (this == other || destinationEquals((DestinationCacheKey) other));
 		}
 
 		@Override
@@ -547,6 +547,16 @@ public class CachingConnectionFactory extends SingleConnectionFactory {
 			// for equivalent destinations... Thanks a lot, WebSphere MQ!
 			return this.destination.getClass().hashCode();
 		}
+
+		@Override
+		public String toString() {
+			return getDestinationString();
+		}
+
+		@Override
+		public int compareTo(DestinationCacheKey other) {
+			return getDestinationString().compareTo(other.getDestinationString());
+		}
 	}
 
 
@@ -584,6 +594,12 @@ public class CachingConnectionFactory extends SingleConnectionFactory {
 					ObjectUtils.nullSafeEquals(this.subscription, otherKey.subscription) &&
 					this.durable == otherKey.durable);
 		}
+
+		@Override
+		public String toString() {
+			return super.toString() + " [selector=" + this.selector + ", noLocal=" + this.noLocal +
+					", subscription=" + this.subscription + ", durable=" + this.durable + "]";
+		}
 	}
 
 }

spring-tx/src/main/java/org/springframework/transaction/interceptor/AbstractFallbackTransactionAttributeSource.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.
@@ -203,7 +203,7 @@ public abstract class AbstractFallbackTransactionAttributeSource implements Tran
 	/**
 	 * Default cache key for the TransactionAttribute cache.
 	 */
-	private static class DefaultCacheKey {
+	private static final class DefaultCacheKey implements Comparable<DefaultCacheKey> {
 
 		private final Method method;
 
@@ -231,6 +231,23 @@ public abstract class AbstractFallbackTransactionAttributeSource implements Tran
 		public int hashCode() {
 			return this.method.hashCode() + (this.targetClass != null ? this.targetClass.hashCode() * 29 : 0);
 		}
+
+		@Override
+		public String toString() {
+			return this.method + (this.targetClass != null ? " on " + this.targetClass : "");
+		}
+
+		@Override
+		public int compareTo(DefaultCacheKey other) {
+			int result = this.method.getName().compareTo(other.method.getName());
+			if (result == 0) {
+				result = this.method.toString().compareTo(other.method.toString());
+				if (result == 0 && this.targetClass != null) {
+					result = this.targetClass.getName().compareTo(other.targetClass.getName());
+				}
+			}
+			return result;
+		}
 	}
 
 }