Alias proxyBeanMethods on annotations meta-annotated with @Configuration

Closes gh-16201

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/ManagementContextConfiguration.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -22,8 +22,10 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.Ordered;
+import org.springframework.core.annotation.AliasFor;
 import org.springframework.core.annotation.Order;
 
 /**
@@ -54,4 +56,29 @@ public @interface ManagementContextConfiguration {
 	 */
 	ManagementContextType value() default ManagementContextType.ANY;
 
+	/**
+	 * Specify whether {@link Bean @Bean} methods should get proxied in order to enforce
+	 * bean lifecycle behavior, e.g. to return shared singleton bean instances even in
+	 * case of direct {@code @Bean} method calls in user code. This feature requires
+	 * method interception, implemented through a runtime-generated CGLIB subclass which
+	 * comes with limitations such as the configuration class and its methods not being
+	 * allowed to declare {@code final}.
+	 * <p>
+	 * The default is {@code true}, allowing for 'inter-bean references' within the
+	 * configuration class as well as for external calls to this configuration's
+	 * {@code @Bean} methods, e.g. from another configuration class. If this is not needed
+	 * since each of this particular configuration's {@code @Bean} methods is
+	 * self-contained and designed as a plain factory method for container use, switch
+	 * this flag to {@code false} in order to avoid CGLIB subclass processing.
+	 * <p>
+	 * Turning off bean method interception effectively processes {@code @Bean} methods
+	 * individually like when declared on non-{@code @Configuration} classes, a.k.a.
+	 * "@Bean Lite Mode" (see {@link Bean @Bean's javadoc}). It is therefore behaviorally
+	 * equivalent to removing the {@code @Configuration} stereotype.
+	 * @return whether to proxy {@code @Bean} methods
+	 * @since 2.2
+	 */
+	@AliasFor(annotation = Configuration.class)
+	boolean proxyBeanMethods() default true;
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/web/ManagementContextConfigurationTests.java

+/*
+ * Copyright 2012-2019 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.boot.actuate.autoconfigure.web;
+
+import org.junit.Test;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.AnnotatedElementUtils;
+import org.springframework.core.annotation.AnnotationAttributes;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ManagementContextConfiguration @ManagementContextConfiguration}.
+ *
+ * @author Andy Wilkinson
+ */
+public class ManagementContextConfigurationTests {
+
+	@Test
+	public void proxyBeanMethodsIsEnabledByDefault() {
+		AnnotationAttributes attributes = AnnotatedElementUtils
+				.getMergedAnnotationAttributes(
+						DefaultManagementContextConfiguration.class, Configuration.class);
+		assertThat(attributes.get("proxyBeanMethods")).isEqualTo(true);
+	}
+
+	@Test
+	public void proxyBeanMethodsCanBeDisabled() {
+		AnnotationAttributes attributes = AnnotatedElementUtils
+				.getMergedAnnotationAttributes(
+						NoBeanMethodProxyingManagementContextConfiguration.class,
+						Configuration.class);
+		assertThat(attributes.get("proxyBeanMethods")).isEqualTo(false);
+	}
+
+	@ManagementContextConfiguration
+	private static class DefaultManagementContextConfiguration {
+
+	}
+
+	@ManagementContextConfiguration(proxyBeanMethods = false)
+	private static class NoBeanMethodProxyingManagementContextConfiguration {
+
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/SpringBootApplication.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -41,6 +41,7 @@ import org.springframework.core.annotation.AliasFor;
  *
  * @author Phillip Webb
  * @author Stephane Nicoll
+ * @author Andy Wilkinson
  * @since 1.2.0
  */
 @Target(ElementType.TYPE)
@@ -91,4 +92,29 @@ public @interface SpringBootApplication {
 	@AliasFor(annotation = ComponentScan.class, attribute = "basePackageClasses")
 	Class<?>[] scanBasePackageClasses() default {};
 
+	/**
+	 * Specify whether {@link Bean @Bean} methods should get proxied in order to enforce
+	 * bean lifecycle behavior, e.g. to return shared singleton bean instances even in
+	 * case of direct {@code @Bean} method calls in user code. This feature requires
+	 * method interception, implemented through a runtime-generated CGLIB subclass which
+	 * comes with limitations such as the configuration class and its methods not being
+	 * allowed to declare {@code final}.
+	 * <p>
+	 * The default is {@code true}, allowing for 'inter-bean references' within the
+	 * configuration class as well as for external calls to this configuration's
+	 * {@code @Bean} methods, e.g. from another configuration class. If this is not needed
+	 * since each of this particular configuration's {@code @Bean} methods is
+	 * self-contained and designed as a plain factory method for container use, switch
+	 * this flag to {@code false} in order to avoid CGLIB subclass processing.
+	 * <p>
+	 * Turning off bean method interception effectively processes {@code @Bean} methods
+	 * individually like when declared on non-{@code @Configuration} classes, a.k.a.
+	 * "@Bean Lite Mode" (see {@link Bean @Bean's javadoc}). It is therefore behaviorally
+	 * equivalent to removing the {@code @Configuration} stereotype.
+	 * @since 2.2
+	 * @return whether to proxy {@code @Bean} methods
+	 */
+	@AliasFor(annotation = Configuration.class)
+	boolean proxyBeanMethods() default true;
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/SpringBootApplicationTests.java

+/*
+ * Copyright 2012-2019 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.boot.autoconfigure;
+
+import org.junit.Test;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.AnnotatedElementUtils;
+import org.springframework.core.annotation.AnnotationAttributes;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SpringBootApplication @SpringBootApplication}.
+ *
+ * @author Andy Wilkinson
+ */
+public class SpringBootApplicationTests {
+
+	@Test
+	public void proxyBeanMethodsIsEnabledByDefault() {
+		AnnotationAttributes attributes = AnnotatedElementUtils
+				.getMergedAnnotationAttributes(DefaultSpringBootApplication.class,
+						Configuration.class);
+		assertThat(attributes.get("proxyBeanMethods")).isEqualTo(true);
+	}
+
+	@Test
+	public void proxyBeanMethodsCanBeDisabled() {
+		AnnotationAttributes attributes = AnnotatedElementUtils
+				.getMergedAnnotationAttributes(
+						NoBeanMethodProxyingSpringBootApplication.class,
+						Configuration.class);
+		assertThat(attributes.get("proxyBeanMethods")).isEqualTo(false);
+	}
+
+	@SpringBootApplication
+	private static class DefaultSpringBootApplication {
+
+	}
+
+	@SpringBootApplication(proxyBeanMethods = false)
+	private static class NoBeanMethodProxyingSpringBootApplication {
+
+	}
+
+}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/SpringBootConfiguration.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 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.
@@ -22,7 +22,9 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.AliasFor;
 
 /**
  * Indicates that a class provides Spring Boot application
@@ -35,6 +37,7 @@ import org.springframework.context.annotation.Configuration;
  * {@code @SpringBootApplication}.
  *
  * @author Phillip Webb
+ * @author Andy Wilkinson
  * @since 1.4.0
  */
 @Target(ElementType.TYPE)
@@ -43,4 +46,29 @@ import org.springframework.context.annotation.Configuration;
 @Configuration
 public @interface SpringBootConfiguration {
 
+	/**
+	 * Specify whether {@link Bean @Bean} methods should get proxied in order to enforce
+	 * bean lifecycle behavior, e.g. to return shared singleton bean instances even in
+	 * case of direct {@code @Bean} method calls in user code. This feature requires
+	 * method interception, implemented through a runtime-generated CGLIB subclass which
+	 * comes with limitations such as the configuration class and its methods not being
+	 * allowed to declare {@code final}.
+	 * <p>
+	 * The default is {@code true}, allowing for 'inter-bean references' within the
+	 * configuration class as well as for external calls to this configuration's
+	 * {@code @Bean} methods, e.g. from another configuration class. If this is not needed
+	 * since each of this particular configuration's {@code @Bean} methods is
+	 * self-contained and designed as a plain factory method for container use, switch
+	 * this flag to {@code false} in order to avoid CGLIB subclass processing.
+	 * <p>
+	 * Turning off bean method interception effectively processes {@code @Bean} methods
+	 * individually like when declared on non-{@code @Configuration} classes, a.k.a.
+	 * "@Bean Lite Mode" (see {@link Bean @Bean's javadoc}). It is therefore behaviorally
+	 * equivalent to removing the {@code @Configuration} stereotype.
+	 * @return whether to proxy {@code @Bean} methods
+	 * @since 2.2
+	 */
+	@AliasFor(annotation = Configuration.class)
+	boolean proxyBeanMethods() default true;
+
 }

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/SpringBootConfigurationTests.java

+/*
+ * Copyright 2012-2019 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.boot;
+
+import org.junit.Test;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.AnnotatedElementUtils;
+import org.springframework.core.annotation.AnnotationAttributes;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SpringBootConfiguration @SpringBootConfiguration}.
+ *
+ * @author Andy Wilkinson
+ */
+public class SpringBootConfigurationTests {
+
+	@Test
+	public void proxyBeanMethodsIsEnabledByDefault() {
+		AnnotationAttributes attributes = AnnotatedElementUtils
+				.getMergedAnnotationAttributes(DefaultSpringBootConfiguration.class,
+						Configuration.class);
+		assertThat(attributes.get("proxyBeanMethods")).isEqualTo(true);
+	}
+
+	@Test
+	public void proxyBeanMethodsCanBeDisabled() {
+		AnnotationAttributes attributes = AnnotatedElementUtils
+				.getMergedAnnotationAttributes(
+						NoBeanMethodProxyingSpringBootConfiguration.class,
+						Configuration.class);
+		assertThat(attributes.get("proxyBeanMethods")).isEqualTo(false);
+	}
+
+	@SpringBootConfiguration
+	private static class DefaultSpringBootConfiguration {
+
+	}
+
+	@SpringBootConfiguration(proxyBeanMethods = false)
+	private static class NoBeanMethodProxyingSpringBootConfiguration {
+
+	}
+
+}