Add default methods to CachingConfigurer

This commit adds default methods to CachingConfigurer and
JCacheConfigurer and removes the reference to their respective support
classes as they are now irrelevant.

Closes gh-27811

Author: snicoll

spring-context-support/src/main/java/org/springframework/cache/jcache/config/JCacheConfigurer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -26,8 +26,7 @@
  * <p>To be implemented by classes annotated with
  * {@link org.springframework.cache.annotation.EnableCaching} that wish
  * or need to specify explicitly how exception caches are resolved for
- * annotation-driven cache management. Consider extending {@link JCacheConfigurerSupport},
- * which provides a stub implementation of all interface methods.
+ * annotation-driven cache management.
  *
  * <p>See {@link org.springframework.cache.annotation.EnableCaching} for
  * general examples and context; see {@link #exceptionCacheResolver()} for
@@ -36,7 +35,6 @@
  * @author Stephane Nicoll
  * @since 4.1
  * @see CachingConfigurer
- * @see JCacheConfigurerSupport
  * @see org.springframework.cache.annotation.EnableCaching
  */
 public interface JCacheConfigurer extends CachingConfigurer {
@@ -60,6 +58,8 @@ public interface JCacheConfigurer extends CachingConfigurer {
 	 * See {@link org.springframework.cache.annotation.EnableCaching} for more complete examples.
 	 */
 	@Nullable
-	CacheResolver exceptionCacheResolver();
+	default CacheResolver exceptionCacheResolver() {
+		return null;
+	}
 
 }

spring-context-support/src/test/java/org/springframework/cache/jcache/JCacheEhCacheAnnotationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -26,7 +26,7 @@
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.cache.annotation.CachingConfigurerSupport;
+import org.springframework.cache.annotation.CachingConfigurer;
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.cache.interceptor.KeyGenerator;
 import org.springframework.cache.interceptor.SimpleKeyGenerator;
@@ -104,7 +104,7 @@ public void testEvictAllEarlyWithTransaction() {
 
 	@Configuration
 	@EnableCaching
-	static class EnableCachingConfig extends CachingConfigurerSupport {
+	static class EnableCachingConfig implements CachingConfigurer {
 
 		@Autowired
 		CachingProvider cachingProvider;

spring-context-support/src/test/java/org/springframework/cache/jcache/config/JCacheJavaConfigTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -180,7 +180,7 @@ public CacheResolver exceptionCacheResolver() {
 
 	@Configuration
 	@EnableCaching
-	public static class EmptyConfigSupportConfig extends JCacheConfigurerSupport {
+	public static class EmptyConfigSupportConfig implements JCacheConfigurer {
 		@Bean
 		public CacheManager cm() {
 			return new NoOpCacheManager();
@@ -190,7 +190,7 @@ public CacheManager cm() {
 
 	@Configuration
 	@EnableCaching
-	static class FullCachingConfigSupport extends JCacheConfigurerSupport {
+	static class FullCachingConfigSupport implements JCacheConfigurer {
 
 		@Override
 		@Bean
@@ -220,7 +220,7 @@ public CacheResolver exceptionCacheResolver() {
 
 	@Configuration
 	@EnableCaching
-	static class NoExceptionCacheResolverConfig extends JCacheConfigurerSupport {
+	static class NoExceptionCacheResolverConfig implements JCacheConfigurer {
 
 		@Override
 		@Bean

spring-context-support/src/test/java/org/springframework/cache/jcache/interceptor/JCacheErrorHandlerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,7 +34,7 @@
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.cache.interceptor.CacheErrorHandler;
 import org.springframework.cache.interceptor.SimpleKeyGenerator;
-import org.springframework.cache.jcache.config.JCacheConfigurerSupport;
+import org.springframework.cache.jcache.config.JCacheConfigurer;
 import org.springframework.cache.support.SimpleCacheManager;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
@@ -141,7 +141,7 @@ public void clearFail() {
 
 	@Configuration
 	@EnableCaching
-	static class Config extends JCacheConfigurerSupport {
+	static class Config implements JCacheConfigurer {
 
 		@Bean
 		@Override

spring-context-support/src/test/java/org/springframework/cache/jcache/interceptor/JCacheKeyGeneratorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,7 +34,7 @@
 import org.springframework.cache.interceptor.KeyGenerator;
 import org.springframework.cache.interceptor.SimpleKey;
 import org.springframework.cache.interceptor.SimpleKeyGenerator;
-import org.springframework.cache.jcache.config.JCacheConfigurerSupport;
+import org.springframework.cache.jcache.config.JCacheConfigurer;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -97,7 +97,7 @@ public void getFiltered() {
 
 	@Configuration
 	@EnableCaching
-	static class Config extends JCacheConfigurerSupport {
+	static class Config implements JCacheConfigurer {
 
 		@Bean
 		@Override
@@ -151,7 +151,7 @@ private void expect(Object... params) {
 		@Override
 		public Object generate(Object target, Method method, Object... params) {
 			assertThat(Arrays.equals(expectedParams, params)).as("Unexpected parameters: expected: "
-								+ Arrays.toString(this.expectedParams) + " but got: " + Arrays.toString(params)).isTrue();
+					+ Arrays.toString(this.expectedParams) + " but got: " + Arrays.toString(params)).isTrue();
 			return new SimpleKey(params);
 		}
 	}

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -26,8 +26,7 @@
  * Interface to be implemented by @{@link org.springframework.context.annotation.Configuration
  * Configuration} classes annotated with @{@link EnableCaching} that wish or need to
  * specify explicitly how caches are resolved and how keys are generated for annotation-driven
- * cache management. Consider extending {@link CachingConfigurerSupport}, which provides a
- * stub implementation of all interface methods.
+ * cache management.
  *
  * <p>See @{@link EnableCaching} for general examples and context; see
  * {@link #cacheManager()}, {@link #cacheResolver()} and {@link #keyGenerator()}
@@ -37,7 +36,6 @@
  * @author Stephane Nicoll
  * @since 3.1
  * @see EnableCaching
- * @see CachingConfigurerSupport
  */
 public interface CachingConfigurer {
 
@@ -64,7 +62,9 @@ public interface CachingConfigurer {
 	 * See @{@link EnableCaching} for more complete examples.
 	 */
 	@Nullable
-	CacheManager cacheManager();
+	default CacheManager cacheManager() {
+		return null;
+	}
 
 	/**
 	 * Return the {@link CacheResolver} bean to use to resolve regular caches for
@@ -89,7 +89,9 @@ public interface CachingConfigurer {
 	 * See {@link EnableCaching} for more complete examples.
 	 */
 	@Nullable
-	CacheResolver cacheResolver();
+	default CacheResolver cacheResolver() {
+		return null;
+	}
 
 	/**
 	 * Return the key generator bean to use for annotation-driven cache management.
@@ -110,7 +112,9 @@ public interface CachingConfigurer {
 	 * See @{@link EnableCaching} for more complete examples.
 	 */
 	@Nullable
-	KeyGenerator keyGenerator();
+	default KeyGenerator keyGenerator() {
+		return null;
+	}
 
 	/**
 	 * Return the {@link CacheErrorHandler} to use to handle cache-related errors.
@@ -133,6 +137,8 @@ public interface CachingConfigurer {
 	 * See @{@link EnableCaching} for more complete examples.
 	 */
 	@Nullable
-	CacheErrorHandler errorHandler();
+	default CacheErrorHandler errorHandler() {
+		return null;
+	}
 
 }

spring-context/src/test/java/org/springframework/cache/CacheReproTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -28,7 +28,7 @@
 import org.springframework.cache.annotation.CachePut;
 import org.springframework.cache.annotation.Cacheable;
 import org.springframework.cache.annotation.Caching;
-import org.springframework.cache.annotation.CachingConfigurerSupport;
+import org.springframework.cache.annotation.CachingConfigurer;
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.cache.concurrent.ConcurrentMapCache;
 import org.springframework.cache.concurrent.ConcurrentMapCacheManager;
@@ -306,7 +306,7 @@ public Object getNeverCache(String key) {
 
 	@Configuration
 	@EnableCaching
-	public static class Spr13081Config extends CachingConfigurerSupport {
+	public static class Spr13081Config implements CachingConfigurer {
 
 		@Bean
 		@Override

spring-context/src/test/java/org/springframework/cache/config/EnableCachingIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -26,7 +26,7 @@
 import org.springframework.cache.CacheManager;
 import org.springframework.cache.annotation.CacheConfig;
 import org.springframework.cache.annotation.Cacheable;
-import org.springframework.cache.annotation.CachingConfigurerSupport;
+import org.springframework.cache.annotation.CachingConfigurer;
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
@@ -124,7 +124,7 @@ private Cache getCache() {
 
 
 	@Configuration
-	static class SharedConfig extends CachingConfigurerSupport {
+	static class SharedConfig implements CachingConfigurer {
 
 		@Override
 		@Bean

spring-context/src/test/java/org/springframework/cache/config/EnableCachingTests.java

@@ -22,7 +22,7 @@
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.beans.factory.NoUniqueBeanDefinitionException;
 import org.springframework.cache.CacheManager;
-import org.springframework.cache.annotation.CachingConfigurerSupport;
+import org.springframework.cache.annotation.CachingConfigurer;
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.cache.interceptor.CacheErrorHandler;
 import org.springframework.cache.interceptor.CacheInterceptor;
@@ -150,7 +150,7 @@ public void bothSetOnlyResolverIsUsed() {
 
 	@Configuration
 	@EnableCaching
-	static class EnableCachingConfig extends CachingConfigurerSupport {
+	static class EnableCachingConfig implements CachingConfigurer {
 
 		@Override
 		@Bean
@@ -227,7 +227,7 @@ public CacheManager cm2() {
 
 	@Configuration
 	@EnableCaching
-	static class MultiCacheManagerConfigurer extends CachingConfigurerSupport {
+	static class MultiCacheManagerConfigurer implements CachingConfigurer {
 
 		@Bean
 		public CacheManager cm1() {
@@ -253,7 +253,7 @@ public KeyGenerator keyGenerator() {
 
 	@Configuration
 	@EnableCaching
-	static class EmptyConfigSupportConfig extends CachingConfigurerSupport {
+	static class EmptyConfigSupportConfig implements CachingConfigurer {
 
 		@Bean
 		public CacheManager cm() {
@@ -264,7 +264,7 @@ public CacheManager cm() {
 
 	@Configuration
 	@EnableCaching
-	static class FullCachingConfig extends CachingConfigurerSupport {
+	static class FullCachingConfig implements CachingConfigurer {
 
 		@Override
 		@Bean

spring-context/src/test/java/org/springframework/cache/config/ExpressionCachingIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -20,7 +20,7 @@
 
 import org.springframework.cache.CacheManager;
 import org.springframework.cache.annotation.CachePut;
-import org.springframework.cache.annotation.CachingConfigurerSupport;
+import org.springframework.cache.annotation.CachingConfigurer;
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.cache.concurrent.ConcurrentMapCacheManager;
 import org.springframework.context.ConfigurableApplicationContext;
@@ -122,7 +122,7 @@ public String getId() {
 
 	@Configuration
 	@EnableCaching
-	static class SharedConfig extends CachingConfigurerSupport {
+	static class SharedConfig implements CachingConfigurer {
 
 		@Override
 		@Bean

spring-context/src/test/java/org/springframework/cache/interceptor/CacheErrorHandlerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -28,7 +28,7 @@
 import org.springframework.cache.annotation.CacheEvict;
 import org.springframework.cache.annotation.CachePut;
 import org.springframework.cache.annotation.Cacheable;
-import org.springframework.cache.annotation.CachingConfigurerSupport;
+import org.springframework.cache.annotation.CachingConfigurer;
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.cache.support.SimpleCacheManager;
 import org.springframework.cache.support.SimpleValueWrapper;
@@ -170,7 +170,7 @@ public void clearFailProperException() {
 
 	@Configuration
 	@EnableCaching
-	static class Config extends CachingConfigurerSupport {
+	static class Config implements CachingConfigurer {
 
 		@Bean
 		@Override

spring-context/src/test/java/org/springframework/cache/interceptor/CachePutEvaluationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -27,7 +27,7 @@
 import org.springframework.cache.annotation.CacheConfig;
 import org.springframework.cache.annotation.CachePut;
 import org.springframework.cache.annotation.Cacheable;
-import org.springframework.cache.annotation.CachingConfigurerSupport;
+import org.springframework.cache.annotation.CachingConfigurer;
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.cache.concurrent.ConcurrentMapCacheManager;
 import org.springframework.context.ConfigurableApplicationContext;
@@ -106,7 +106,7 @@ public void getAndPut() {
 
 	@Configuration
 	@EnableCaching
-	static class Config extends CachingConfigurerSupport {
+	static class Config implements CachingConfigurer {
 
 		@Bean
 		@Override