Avoid storage of null marker per method for proxy decision purposes

Includes missing isCandidateClass support on JCacheOperationSource.

Closes gh-20072

spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/AbstractFallbackJCacheOperationSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -27,14 +27,13 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.aop.support.AopUtils;
 import org.springframework.core.MethodClassKey;
 import org.springframework.lang.Nullable;
+import org.springframework.util.ReflectionUtils;
 
 /**
- * Abstract implementation of {@link JCacheOperationSource} that caches attributes
+ * Abstract implementation of {@link JCacheOperationSource} that caches operations
  * for methods and implements a fallback policy: 1. specific target method;
  * 2. declaring method.
  *
- * <p>This implementation caches attributes by method after they are first used.
- *
  * @author Stephane Nicoll
  * @author Juergen Hoeller
  * @since 4.1
@@ -43,24 +42,39 @@ import org.springframework.lang.Nullable;
 public abstract class AbstractFallbackJCacheOperationSource implements JCacheOperationSource {
 
 	/**
-	 * Canonical value held in cache to indicate no caching attribute was
+	 * Canonical value held in cache to indicate no cache operation was
-	 * found for this method and we don't need to look again.
+	 * found for this method, and we don't need to look again.
 	 */
-	private static final Object NULL_CACHING_ATTRIBUTE = new Object();
+	private static final Object NULL_CACHING_MARKER = new Object();
 
 
 	protected final Log logger = LogFactory.getLog(getClass());
 
-	private final Map<MethodClassKey, Object> cache = new ConcurrentHashMap<>(1024);
+	private final Map<MethodClassKey, Object> operationCache = new ConcurrentHashMap<>(1024);
+
 
+	@Override
+	public boolean hasCacheOperation(Method method, @Nullable Class<?> targetClass) {
+		return (getCacheOperation(method, targetClass, false) != null);
+	}
 
 	@Override
+	@Nullable
 	public JCacheOperation<?> getCacheOperation(Method method, @Nullable Class<?> targetClass) {
+		return getCacheOperation(method, targetClass, true);
+	}
+
+	@Nullable
+	private JCacheOperation<?> getCacheOperation(Method method, @Nullable Class<?> targetClass, boolean cacheNull) {
+		if (ReflectionUtils.isObjectMethod(method)) {
+			return null;
+		}
+
 		MethodClassKey cacheKey = new MethodClassKey(method, targetClass);
-		Object cached = this.cache.get(cacheKey);
+		Object cached = this.operationCache.get(cacheKey);
 
 		if (cached != null) {
-			return (cached != NULL_CACHING_ATTRIBUTE ? (JCacheOperation<?>) cached : null);
+			return (cached != NULL_CACHING_MARKER ? (JCacheOperation<?>) cached : null);
 		}
 		else {
 			JCacheOperation<?> operation = computeCacheOperation(method, targetClass);
@@ -68,10 +82,10 @@ public abstract class AbstractFallbackJCacheOperationSource implements JCacheOpe
 				if (logger.isDebugEnabled()) {
 					logger.debug("Adding cacheable method '" + method.getName() + "' with operation: " + operation);
 				}
-				this.cache.put(cacheKey, operation);
+				this.operationCache.put(cacheKey, operation);
 			}
-			else {
+			else if (cacheNull) {
-				this.cache.put(cacheKey, NULL_CACHING_ATTRIBUTE);
+				this.operationCache.put(cacheKey, NULL_CACHING_MARKER);
 			}
 			return operation;
 		}
@@ -84,7 +98,7 @@ public abstract class AbstractFallbackJCacheOperationSource implements JCacheOpe
 			return null;
 		}
 
-		// The method may be on an interface, but we need attributes from the target class.
+		// The method may be on an interface, but we need metadata from the target class.
 		// If the target class is null, the method will be unchanged.
 		Method specificMethod = AopUtils.getMostSpecificMethod(method, targetClass);
 

spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/AnnotationJCacheOperationSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2024 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.lang.annotation.Annotation;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 
 import javax.cache.annotation.CacheDefaults;
 import javax.cache.annotation.CacheKeyGenerator;
@@ -32,6 +33,7 @@ import javax.cache.annotation.CacheResult;
 
 import org.springframework.cache.interceptor.CacheResolver;
 import org.springframework.cache.interceptor.KeyGenerator;
+import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.lang.Nullable;
 import org.springframework.util.StringUtils;
 
@@ -41,10 +43,20 @@ import org.springframework.util.StringUtils;
  * {@link CacheRemoveAll} annotations.
  *
  * @author Stephane Nicoll
+ * @author Juergen Hoeller
  * @since 4.1
  */
 public abstract class AnnotationJCacheOperationSource extends AbstractFallbackJCacheOperationSource {
 
+	private static final Set<Class<? extends Annotation>> JCACHE_OPERATION_ANNOTATIONS =
+			Set.of(CacheResult.class, CachePut.class, CacheRemove.class, CacheRemoveAll.class);
+
+
+	@Override
+	public boolean isCandidateClass(Class<?> targetClass) {
+		return AnnotationUtils.isCandidateClass(targetClass, JCACHE_OPERATION_ANNOTATIONS);
+	}
+
 	@Override
 	protected JCacheOperation<?> findCacheOperation(Method method, @Nullable Class<?> targetType) {
 		CacheResult cacheResult = method.getAnnotation(CacheResult.class);

spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/BeanFactoryJCacheOperationSourceAdvisor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -16,15 +16,9 @@
 
 package org.springframework.cache.jcache.interceptor;
 
-import java.io.Serializable;
-import java.lang.reflect.Method;
-
 import org.springframework.aop.ClassFilter;
 import org.springframework.aop.Pointcut;
 import org.springframework.aop.support.AbstractBeanFactoryPointcutAdvisor;
-import org.springframework.aop.support.StaticMethodMatcherPointcut;
-import org.springframework.lang.Nullable;
-import org.springframework.util.ObjectUtils;
 
 /**
  * Advisor driven by a {@link JCacheOperationSource}, used to include a
@@ -46,6 +40,7 @@ public class BeanFactoryJCacheOperationSourceAdvisor extends AbstractBeanFactory
 	 * Set the cache operation attribute source which is used to find cache
 	 * attributes. This should usually be identical to the source reference
 	 * set on the cache interceptor itself.
+	 * @see JCacheInterceptor#setCacheOperationSource
 	 */
 	public void setCacheOperationSource(JCacheOperationSource cacheOperationSource) {
 		this.pointcut.setCacheOperationSource(cacheOperationSource);
@@ -64,37 +59,4 @@ public class BeanFactoryJCacheOperationSourceAdvisor extends AbstractBeanFactory
 		return this.pointcut;
 	}
 
-
-	private static class JCacheOperationSourcePointcut extends StaticMethodMatcherPointcut implements Serializable {
-
-		@Nullable
-		private JCacheOperationSource cacheOperationSource;
-
-		public void setCacheOperationSource(@Nullable JCacheOperationSource cacheOperationSource) {
-			this.cacheOperationSource = cacheOperationSource;
-		}
-
-		@Override
-		public boolean matches(Method method, Class<?> targetClass) {
-			return (this.cacheOperationSource == null ||
-					this.cacheOperationSource.getCacheOperation(method, targetClass) != null);
-		}
-
-		@Override
-		public boolean equals(@Nullable Object other) {
-			return (this == other || (other instanceof JCacheOperationSourcePointcut that &&
-					ObjectUtils.nullSafeEquals(this.cacheOperationSource, that.cacheOperationSource)));
-		}
-
-		@Override
-		public int hashCode() {
-			return JCacheOperationSourcePointcut.class.hashCode();
-		}
-
-		@Override
-		public String toString() {
-			return getClass().getName() + ": " + this.cacheOperationSource;
-		}
-	}
-
 }

spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/JCacheOperationSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -25,16 +25,48 @@ import org.springframework.lang.Nullable;
  * cache operation attributes from standard JSR-107 annotations.
  *
  * @author Stephane Nicoll
+ * @author Juergen Hoeller
  * @since 4.1
  * @see org.springframework.cache.interceptor.CacheOperationSource
  */
 public interface JCacheOperationSource {
 
+	/**
+	 * Determine whether the given class is a candidate for cache operations
+	 * in the metadata format of this {@code JCacheOperationSource}.
+	 * <p>If this method returns {@code false}, the methods on the given class
+	 * will not get traversed for {@link #getCacheOperation} introspection.
+	 * Returning {@code false} is therefore an optimization for non-affected
+	 * classes, whereas {@code true} simply means that the class needs to get
+	 * fully introspected for each method on the given class individually.
+	 * @param targetClass the class to introspect
+	 * @return {@code false} if the class is known to have no cache operation
+	 * metadata at class or method level; {@code true} otherwise. The default
+	 * implementation returns {@code true}, leading to regular introspection.
+	 * @since 6.2
+	 * @see #hasCacheOperation
+	 */
+	default boolean isCandidateClass(Class<?> targetClass) {
+		return true;
+	}
+
+	/**
+	 * Determine whether there is a JSR-107 cache operation for the given method.
+	 * @param method the method to introspect
+	 * @param targetClass the target class (can be {@code null}, in which case
+	 * the declaring class of the method must be used)
+	 * @since 6.2
+	 * @see #getCacheOperation
+	 */
+	default boolean hasCacheOperation(Method method, @Nullable Class<?> targetClass) {
+		return (getCacheOperation(method, targetClass) != null);
+	}
+
 	/**
 	 * Return the cache operations for this method, or {@code null}
 	 * if the method contains no <em>JSR-107</em> related metadata.
 	 * @param method the method to introspect
-	 * @param targetClass the target class (may be {@code null}, in which case
+	 * @param targetClass the target class (can be {@code null}, in which case
 	 * the declaring class of the method must be used)
 	 * @return the cache operation for this method, or {@code null} if none found
 	 */

spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/JCacheOperationSourcePointcut.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright 2002-2024 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
+ *
+ *      https://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.cache.jcache.interceptor;
+
+import java.io.Serializable;
+import java.lang.reflect.Method;
+
+import org.springframework.aop.ClassFilter;
+import org.springframework.aop.support.StaticMethodMatcherPointcut;
+import org.springframework.cache.CacheManager;
+import org.springframework.lang.Nullable;
+import org.springframework.util.ObjectUtils;
+
+/**
+ * A {@code Pointcut} that matches if the underlying {@link JCacheOperationSource}
+ * has an operation for a given method.
+ *
+ * @author Juergen Hoeller
+ * @since 6.2
+ */
+@SuppressWarnings("serial")
+final class JCacheOperationSourcePointcut extends StaticMethodMatcherPointcut implements Serializable {
+
+	@Nullable
+	private JCacheOperationSource cacheOperationSource;
+
+
+	public JCacheOperationSourcePointcut() {
+		setClassFilter(new JCacheOperationSourceClassFilter());
+	}
+
+
+	public void setCacheOperationSource(@Nullable JCacheOperationSource cacheOperationSource) {
+		this.cacheOperationSource = cacheOperationSource;
+	}
+
+	@Override
+	public boolean matches(Method method, Class<?> targetClass) {
+		return (this.cacheOperationSource == null ||
+				this.cacheOperationSource.hasCacheOperation(method, targetClass));
+	}
+
+	@Override
+	public boolean equals(@Nullable Object other) {
+		return (this == other || (other instanceof JCacheOperationSourcePointcut that &&
+				ObjectUtils.nullSafeEquals(this.cacheOperationSource, that.cacheOperationSource)));
+	}
+
+	@Override
+	public int hashCode() {
+		return JCacheOperationSourcePointcut.class.hashCode();
+	}
+
+	@Override
+	public String toString() {
+		return getClass().getName() + ": " + this.cacheOperationSource;
+	}
+
+
+	/**
+	 * {@link ClassFilter} that delegates to {@link JCacheOperationSource#isCandidateClass}
+	 * for filtering classes whose methods are not worth searching to begin with.
+	 */
+	private final class JCacheOperationSourceClassFilter implements ClassFilter {
+
+		@Override
+		public boolean matches(Class<?> clazz) {
+			if (CacheManager.class.isAssignableFrom(clazz)) {
+				return false;
+			}
+			return (cacheOperationSource == null || cacheOperationSource.isCandidateClass(clazz));
+		}
+
+		@Nullable
+		private JCacheOperationSource getCacheOperationSource() {
+			return cacheOperationSource;
+		}
+
+		@Override
+		public boolean equals(@Nullable Object other) {
+			return (this == other || (other instanceof JCacheOperationSourceClassFilter that &&
+					ObjectUtils.nullSafeEquals(getCacheOperationSource(), that.getCacheOperationSource())));
+		}
+
+		@Override
+		public int hashCode() {
+			return JCacheOperationSourceClassFilter.class.hashCode();
+		}
+
+		@Override
+		public String toString() {
+			return JCacheOperationSourceClassFilter.class.getName() + ": " + getCacheOperationSource();
+		}
+	}
+
+}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -30,22 +30,20 @@ import org.springframework.aop.support.AopUtils;
 import org.springframework.core.MethodClassKey;
 import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.CollectionUtils;
+import org.springframework.util.ReflectionUtils;
 
 /**
- * Abstract implementation of {@link CacheOperation} that caches attributes
+ * Abstract implementation of {@link CacheOperationSource} that caches operations
  * for methods and implements a fallback policy: 1. specific target method;
  * 2. target class; 3. declaring method; 4. declaring class/interface.
  *
- * <p>Defaults to using the target class's caching attribute if none is
+ * <p>Defaults to using the target class's declared cache operations if none are
- * associated with the target method. Any caching attribute associated with
+ * associated with the target method. Any cache operations associated with
- * the target method completely overrides a class caching attribute.
+ * the target method completely override any class-level declarations.
  * If none found on the target class, the interface that the invoked method
  * has been called through (in case of a JDK proxy) will be checked.
  *
- * <p>This implementation caches attributes by method after they are first
- * used. If it is ever desirable to allow dynamic changing of cacheable
- * attributes (which is very unlikely), caching could be made configurable.
- *
  * @author Costin Leau
  * @author Juergen Hoeller
  * @since 3.1
@@ -53,10 +51,10 @@ import org.springframework.util.ClassUtils;
 public abstract class AbstractFallbackCacheOperationSource implements CacheOperationSource {
 
 	/**
-	 * Canonical value held in cache to indicate no caching attribute was
+	 * Canonical value held in cache to indicate no cache operation was
-	 * found for this method and we don't need to look again.
+	 * found for this method, and we don't need to look again.
 	 */
-	private static final Collection<CacheOperation> NULL_CACHING_ATTRIBUTE = Collections.emptyList();
+	private static final Collection<CacheOperation> NULL_CACHING_MARKER = Collections.emptyList();
 
 
 	/**
@@ -71,40 +69,53 @@ public abstract class AbstractFallbackCacheOperationSource implements CacheOpera
 	 * <p>As this base class is not marked Serializable, the cache will be recreated
 	 * after serialization - provided that the concrete subclass is Serializable.
 	 */
-	private final Map<Object, Collection<CacheOperation>> attributeCache = new ConcurrentHashMap<>(1024);
+	private final Map<Object, Collection<CacheOperation>> operationCache = new ConcurrentHashMap<>(1024);
+
+
+	@Override
+	public boolean hasCacheOperations(Method method, @Nullable Class<?> targetClass) {
+		return !CollectionUtils.isEmpty(getCacheOperations(method, targetClass, false));
+	}
 
+	@Override
+	@Nullable
+	public Collection<CacheOperation> getCacheOperations(Method method, @Nullable Class<?> targetClass) {
+		return getCacheOperations(method, targetClass, true);
+	}
 
 	/**
-	 * Determine the caching attribute for this method invocation.
+	 * Determine the cache operations for this method invocation.
-	 * <p>Defaults to the class's caching attribute if no method attribute is found.
+	 * <p>Defaults to class-declared metadata if no method-level metadata is found.
 	 * @param method the method for the current invocation (never {@code null})
-	 * @param targetClass the target class for this invocation (may be {@code null})
+	 * @param targetClass the target class for this invocation (can be {@code null})
+	 * @param cacheNull whether {@code null} results should be cached as well
 	 * @return {@link CacheOperation} for this method, or {@code null} if the method
 	 * is not cacheable
 	 */
-	@Override
 	@Nullable
-	public Collection<CacheOperation> getCacheOperations(Method method, @Nullable Class<?> targetClass) {
+	private Collection<CacheOperation> getCacheOperations(
-		if (method.getDeclaringClass() == Object.class) {
+			Method method, @Nullable Class<?> targetClass, boolean cacheNull) {
+
+		if (ReflectionUtils.isObjectMethod(method)) {
 			return null;
 		}
 
 		Object cacheKey = getCacheKey(method, targetClass);
-		Collection<CacheOperation> cached = this.attributeCache.get(cacheKey);
+		Collection<CacheOperation> cached = this.operationCache.get(cacheKey);
 
 		if (cached != null) {
-			return (cached != NULL_CACHING_ATTRIBUTE ? cached : null);
+			return (cached != NULL_CACHING_MARKER ? cached : null);
 		}
 		else {
 			Collection<CacheOperation> cacheOps = computeCacheOperations(method, targetClass);
 			if (cacheOps != null) {
 				if (logger.isTraceEnabled()) {
-					logger.trace("Adding cacheable method '" + method.getName() + "' with attribute: " + cacheOps);
+					logger.trace("Adding cacheable method '" + method.getName() + "' with operations: " + cacheOps);
 				}
-				this.attributeCache.put(cacheKey, cacheOps);
+				this.operationCache.put(cacheKey, cacheOps);
 			}
-			else {
+			else if (cacheNull) {
-				this.attributeCache.put(cacheKey, NULL_CACHING_ATTRIBUTE);
+				this.operationCache.put(cacheKey, NULL_CACHING_MARKER);
 			}
 			return cacheOps;
 		}
@@ -129,7 +140,7 @@ public abstract class AbstractFallbackCacheOperationSource implements CacheOpera
 			return null;
 		}
 
-		// The method may be on an interface, but we need attributes from the target class.
+		// The method may be on an interface, but we need metadata from the target class.
 		// If the target class is null, the method will be unchanged.
 		Method specificMethod = AopUtils.getMostSpecificMethod(method, targetClass);
 
@@ -163,19 +174,19 @@ public abstract class AbstractFallbackCacheOperationSource implements CacheOpera
 
 
 	/**
-	 * Subclasses need to implement this to return the caching attribute for the
+	 * Subclasses need to implement this to return the cache operations for the
 	 * given class, if any.
-	 * @param clazz the class to retrieve the attribute for
+	 * @param clazz the class to retrieve the cache operations for
-	 * @return all caching attribute associated with this class, or {@code null} if none
+	 * @return all cache operations associated with this class, or {@code null} if none
 	 */
 	@Nullable
 	protected abstract Collection<CacheOperation> findCacheOperations(Class<?> clazz);
 
 	/**
-	 * Subclasses need to implement this to return the caching attribute for the
+	 * Subclasses need to implement this to return the cache operations for the
 	 * given method, if any.
-	 * @param method the method to retrieve the attribute for
+	 * @param method the method to retrieve the cache operations for
-	 * @return all caching attribute associated with this method, or {@code null} if none
+	 * @return all cache operations associated with this method, or {@code null} if none
 	 */
 	@Nullable
 	protected abstract Collection<CacheOperation> findCacheOperations(Method method);

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2024 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.lang.reflect.Method;
 import java.util.Collection;
 
 import org.springframework.lang.Nullable;
+import org.springframework.util.CollectionUtils;
 
 /**
  * Interface used by {@link CacheInterceptor}. Implementations know how to source
@@ -45,16 +46,29 @@ public interface CacheOperationSource {
 	 * metadata at class or method level; {@code true} otherwise. The default
 	 * implementation returns {@code true}, leading to regular introspection.
 	 * @since 5.2
+	 * @see #hasCacheOperations
 	 */
 	default boolean isCandidateClass(Class<?> targetClass) {
 		return true;
 	}
 
+	/**
+	 * Determine whether there are cache operations for the given method.
+	 * @param method the method to introspect
+	 * @param targetClass the target class (can be {@code null},
+	 * in which case the declaring class of the method must be used)
+	 * @since 6.2
+	 * @see #getCacheOperations
+	 */
+	default boolean hasCacheOperations(Method method, @Nullable Class<?> targetClass) {
+		return !CollectionUtils.isEmpty(getCacheOperations(method, targetClass));
+	}
+
 	/**
 	 * Return the collection of cache operations for this method,
 	 * or {@code null} if the method contains no <em>cacheable</em> annotations.
 	 * @param method the method to introspect
-	 * @param targetClass the target class (may be {@code null}, in which case
+	 * @param targetClass the target class (can be {@code null}, in which case
 	 * the declaring class of the method must be used)
 	 * @return all cache operations for this method, or {@code null} if none found
 	 */

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -23,12 +23,11 @@ import org.springframework.aop.ClassFilter;
 import org.springframework.aop.support.StaticMethodMatcherPointcut;
 import org.springframework.cache.CacheManager;
 import org.springframework.lang.Nullable;
-import org.springframework.util.CollectionUtils;
 import org.springframework.util.ObjectUtils;
 
 /**
  * A {@code Pointcut} that matches if the underlying {@link CacheOperationSource}
- * has an attribute for a given method.
+ * has an operation for a given method.
  *
  * @author Costin Leau
  * @author Juergen Hoeller
@@ -36,7 +35,7 @@ import org.springframework.util.ObjectUtils;
  * @since 3.1
  */
 @SuppressWarnings("serial")
-class CacheOperationSourcePointcut extends StaticMethodMatcherPointcut implements Serializable {
+final class CacheOperationSourcePointcut extends StaticMethodMatcherPointcut implements Serializable {
 
 	@Nullable
 	private CacheOperationSource cacheOperationSource;
@@ -54,7 +53,7 @@ class CacheOperationSourcePointcut extends StaticMethodMatcherPointcut implement
 	@Override
 	public boolean matches(Method method, Class<?> targetClass) {
 		return (this.cacheOperationSource == null ||
-				!CollectionUtils.isEmpty(this.cacheOperationSource.getCacheOperations(method, targetClass)));
+				this.cacheOperationSource.hasCacheOperations(method, targetClass));
 	}
 
 	@Override
@@ -78,7 +77,7 @@ class CacheOperationSourcePointcut extends StaticMethodMatcherPointcut implement
 	 * {@link ClassFilter} that delegates to {@link CacheOperationSource#isCandidateClass}
 	 * for filtering classes whose methods are not worth searching to begin with.
 	 */
-	private class CacheOperationSourceClassFilter implements ClassFilter {
+	private final class CacheOperationSourceClassFilter implements ClassFilter {
 
 		@Override
 		public boolean matches(Class<?> clazz) {
@@ -88,6 +87,7 @@ class CacheOperationSourcePointcut extends StaticMethodMatcherPointcut implement
 			return (cacheOperationSource == null || cacheOperationSource.isCandidateClass(clazz));
 		}
 
+		@Nullable
 		private CacheOperationSource getCacheOperationSource() {
 			return cacheOperationSource;
 		}
@@ -95,7 +95,7 @@ class CacheOperationSourcePointcut extends StaticMethodMatcherPointcut implement
 		@Override
 		public boolean equals(@Nullable Object other) {
 			return (this == other || (other instanceof CacheOperationSourceClassFilter that &&
-					ObjectUtils.nullSafeEquals(cacheOperationSource, that.getCacheOperationSource())));
+					ObjectUtils.nullSafeEquals(getCacheOperationSource(), that.getCacheOperationSource())));
 		}
 
 		@Override
@@ -105,9 +105,8 @@ class CacheOperationSourcePointcut extends StaticMethodMatcherPointcut implement
 
 		@Override
 		public String toString() {
-			return CacheOperationSourceClassFilter.class.getName() + ": " + cacheOperationSource;
+			return CacheOperationSourceClassFilter.class.getName() + ": " + getCacheOperationSource();
 		}
-
 	}
 
 }

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -29,6 +29,7 @@ import org.springframework.context.EmbeddedValueResolverAware;
 import org.springframework.core.MethodClassKey;
 import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.ReflectionUtils;
 import org.springframework.util.StringValueResolver;
 
 /**
@@ -42,11 +43,6 @@ import org.springframework.util.StringValueResolver;
  * If none found on the target class, the interface that the invoked method
  * has been called through (in case of a JDK proxy) will be checked.
  *
- * <p>This implementation caches attributes by method after they are first used.
- * If it is ever desirable to allow dynamic changing of transaction attributes
- * (which is very unlikely), caching could be made configurable. Caching is
- * desirable because of the cost of evaluating rollback rules.
- *
  * @author Rod Johnson
  * @author Juergen Hoeller
  * @since 1.1
@@ -91,42 +87,43 @@ public abstract class AbstractFallbackTransactionAttributeSource
 	}
 
 
+	@Override
+	public boolean hasTransactionAttribute(Method method, @Nullable Class<?> targetClass) {
+		return (getTransactionAttribute(method, targetClass, false) != null);
+	}
+
+	@Override
+	@Nullable
+	public TransactionAttribute getTransactionAttribute(Method method, @Nullable Class<?> targetClass) {
+		return getTransactionAttribute(method, targetClass, true);
+	}
+
 	/**
 	 * Determine the transaction attribute for this method invocation.
 	 * <p>Defaults to the class's transaction attribute if no method attribute is found.
 	 * @param method the method for the current invocation (never {@code null})
-	 * @param targetClass the target class for this invocation (may be {@code null})
+	 * @param targetClass the target class for this invocation (can be {@code null})
+	 * @param cacheNull whether {@code null} results should be cached as well
 	 * @return a TransactionAttribute for this method, or {@code null} if the method
 	 * is not transactional
 	 */
-	@Override
 	@Nullable
-	public TransactionAttribute getTransactionAttribute(Method method, @Nullable Class<?> targetClass) {
+	private TransactionAttribute getTransactionAttribute(
-		if (method.getDeclaringClass() == Object.class) {
+			Method method, @Nullable Class<?> targetClass, boolean cacheNull) {
+
+		if (ReflectionUtils.isObjectMethod(method)) {
 			return null;
 		}
 
-		// First, see if we have a cached value.
 		Object cacheKey = getCacheKey(method, targetClass);
 		TransactionAttribute cached = this.attributeCache.get(cacheKey);
+
 		if (cached != null) {
-			// Value will either be canonical value indicating there is no transaction attribute,
+			return (cached != NULL_TRANSACTION_ATTRIBUTE ? cached : null);
-			// or an actual transaction attribute.
-			if (cached == NULL_TRANSACTION_ATTRIBUTE) {
-				return null;
-			}
-			else {
-				return cached;
-			}
 		}
 		else {
-			// We need to work it out.
 			TransactionAttribute txAttr = computeTransactionAttribute(method, targetClass);
-			// Put it in the cache.
+			if (txAttr != null) {
-			if (txAttr == null) {
-				this.attributeCache.put(cacheKey, NULL_TRANSACTION_ATTRIBUTE);
-			}
-			else {
 				String methodIdentification = ClassUtils.getQualifiedMethodName(method, targetClass);
 				if (txAttr instanceof DefaultTransactionAttribute dta) {
 					dta.setDescriptor(methodIdentification);
@@ -137,6 +134,9 @@ public abstract class AbstractFallbackTransactionAttributeSource
 				}
 				this.attributeCache.put(cacheKey, txAttr);
 			}
+			else if (cacheNull) {
+				this.attributeCache.put(cacheKey, NULL_TRANSACTION_ATTRIBUTE);
+			}
 			return txAttr;
 		}
 	}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -48,16 +48,29 @@ public interface TransactionAttributeSource {
 	 * attributes at class or method level; {@code true} otherwise. The default
 	 * implementation returns {@code true}, leading to regular introspection.
 	 * @since 5.2
+	 * @see #hasTransactionAttribute
 	 */
 	default boolean isCandidateClass(Class<?> targetClass) {
 		return true;
 	}
 
+	/**
+	 * Determine whether there is a transaction attribute for the given method.
+	 * @param method the method to introspect
+	 * @param targetClass the target class (can be {@code null},
+	 * in which case the declaring class of the method must be used)
+	 * @since 6.2
+	 * @see #getTransactionAttribute
+	 */
+	default boolean hasTransactionAttribute(Method method, @Nullable Class<?> targetClass) {
+		return (getTransactionAttribute(method, targetClass) != null);
+	}
+
 	/**
 	 * Return the transaction attribute for the given method,
 	 * or {@code null} if the method is non-transactional.
 	 * @param method the method to introspect
-	 * @param targetClass the target class (may be {@code null},
+	 * @param targetClass the target class (can be {@code null},
 	 * in which case the declaring class of the method must be used)
 	 * @return the matching transaction attribute, or {@code null} if none found
 	 */

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -53,7 +53,7 @@ final class TransactionAttributeSourcePointcut extends StaticMethodMatcherPointc
 	@Override
 	public boolean matches(Method method, Class<?> targetClass) {
 		return (this.transactionAttributeSource == null ||
-				this.transactionAttributeSource.getTransactionAttribute(method, targetClass) != null);
+				this.transactionAttributeSource.hasTransactionAttribute(method, targetClass));
 	}
 
 	@Override
@@ -77,7 +77,7 @@ final class TransactionAttributeSourcePointcut extends StaticMethodMatcherPointc
 	 * {@link ClassFilter} that delegates to {@link TransactionAttributeSource#isCandidateClass}
 	 * for filtering classes whose methods are not worth searching to begin with.
 	 */
-	private class TransactionAttributeSourceClassFilter implements ClassFilter {
+	private final class TransactionAttributeSourceClassFilter implements ClassFilter {
 
 		@Override
 		public boolean matches(Class<?> clazz) {
@@ -89,6 +89,7 @@ final class TransactionAttributeSourcePointcut extends StaticMethodMatcherPointc
 			return (transactionAttributeSource == null || transactionAttributeSource.isCandidateClass(clazz));
 		}
 
+		@Nullable
 		private TransactionAttributeSource getTransactionAttributeSource() {
 			return transactionAttributeSource;
 		}
@@ -96,7 +97,7 @@ final class TransactionAttributeSourcePointcut extends StaticMethodMatcherPointc
 		@Override
 		public boolean equals(@Nullable Object other) {
 			return (this == other || (other instanceof TransactionAttributeSourceClassFilter that &&
-					ObjectUtils.nullSafeEquals(transactionAttributeSource, that.getTransactionAttributeSource())));
+					ObjectUtils.nullSafeEquals(getTransactionAttributeSource(), that.getTransactionAttributeSource())));
 		}
 
 		@Override
@@ -106,9 +107,8 @@ final class TransactionAttributeSourcePointcut extends StaticMethodMatcherPointc
 
 		@Override
 		public String toString() {
-			return TransactionAttributeSourceClassFilter.class.getName() + ": " + transactionAttributeSource;
+			return TransactionAttributeSourceClassFilter.class.getName() + ": " + getTransactionAttributeSource();
 		}
-
 	}
 
 }