Don't generate @configuration metadata

Update `AutoConfigureAnnotationProcessor` to no longer store
`@Configuration.value` in the meta-data JSON since we never actually
read it.

Closes spring-projectsgh-16608

Author: philwebb

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/main/java/org/springframework/boot/autoconfigureprocessor/AutoConfigureAnnotationProcessor.java

@@ -51,8 +51,7 @@
  * @author Phillip Webb
  * @since 1.5.0
  */
-@SupportedAnnotationTypes({ "org.springframework.context.annotation.Configuration",
-		"org.springframework.boot.autoconfigure.condition.ConditionalOnClass",
+@SupportedAnnotationTypes({ "org.springframework.boot.autoconfigure.condition.ConditionalOnClass",
 		"org.springframework.boot.autoconfigure.condition.ConditionalOnBean",
 		"org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandidate",
 		"org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication",
@@ -79,7 +78,6 @@ public AutoConfigureAnnotationProcessor() {
 	}
 
 	protected void addAnnotations(Map<String, String> annotations) {
-		annotations.put("Configuration", "org.springframework.context.annotation.Configuration");
 		annotations.put("ConditionalOnClass", "org.springframework.boot.autoconfigure.condition.ConditionalOnClass");
 		annotations.put("ConditionalOnBean", "org.springframework.boot.autoconfigure.condition.ConditionalOnBean");
 		annotations.put("ConditionalOnSingleCandidate",
@@ -92,7 +90,6 @@ protected void addAnnotations(Map<String, String> annotations) {
 	}
 
 	private void addValueExtractors(Map<String, ValueExtractor> attributes) {
-		attributes.put("Configuration", ValueExtractor.allFrom("value"));
 		attributes.put("ConditionalOnClass", new OnClassConditionValueExtractor());
 		attributes.put("ConditionalOnBean", new OnBeanConditionValueExtractor());
 		attributes.put("ConditionalOnSingleCandidate", new OnBeanConditionValueExtractor());

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/AutoConfigureAnnotationProcessorTests.java

@@ -18,8 +18,6 @@
 
 import java.io.File;
 import java.io.IOException;
-import java.util.ArrayList;
-import java.util.List;
 import java.util.Properties;
 
 import org.junit.jupiter.api.BeforeEach;
@@ -50,14 +48,12 @@ void createCompiler() throws IOException {
 	@Test
 	void annotatedClass() throws Exception {
 		Properties properties = compile(TestClassConfiguration.class);
-		assertThat(properties).hasSize(6);
+		assertThat(properties).hasSize(5);
 		assertThat(properties).containsEntry(
 				"org.springframework.boot.autoconfigureprocessor.TestClassConfiguration.ConditionalOnClass",
 				"java.io.InputStream,org.springframework.boot.autoconfigureprocessor."
 						+ "TestClassConfiguration$Nested,org.springframework.foo");
 		assertThat(properties).containsKey("org.springframework.boot.autoconfigureprocessor.TestClassConfiguration");
-		assertThat(properties)
-				.containsKey("org.springframework.boot.autoconfigureprocessor.TestClassConfiguration.Configuration");
 		assertThat(properties)
 				.doesNotContainKey("org.springframework.boot.autoconfigureprocessor.TestClassConfiguration$Nested");
 		assertThat(properties).containsEntry(
@@ -72,7 +68,7 @@ void annotatedClass() throws Exception {
 	@Test
 	void annotatedClassWithOnBeanThatHasName() throws Exception {
 		Properties properties = compile(TestOnBeanWithNameClassConfiguration.class);
-		assertThat(properties).hasSize(3);
+		assertThat(properties).hasSize(2);
 		assertThat(properties).containsEntry(
 				"org.springframework.boot.autoconfigureprocessor.TestOnBeanWithNameClassConfiguration.ConditionalOnBean",
 				"");
@@ -81,15 +77,7 @@ void annotatedClassWithOnBeanThatHasName() throws Exception {
 	@Test
 	void annotatedMethod() throws Exception {
 		Properties properties = compile(TestMethodConfiguration.class);
-		List<String> matching = new ArrayList<>();
-		for (Object key : properties.keySet()) {
-			if (key.toString().startsWith("org.springframework.boot.autoconfigureprocessor.TestMethodConfiguration")) {
-				matching.add(key.toString());
-			}
-		}
-		assertThat(matching).hasSize(2)
-				.contains("org.springframework.boot.autoconfigureprocessor.TestMethodConfiguration")
-				.contains("org.springframework.boot.autoconfigureprocessor.TestMethodConfiguration.Configuration");
+		assertThat(properties).isNull();
 	}
 
 	@Test

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/TestAutoConfigureAnnotationProcessor.java

@@ -29,11 +29,10 @@
  *
  * @author Madhura Bhave
  */
-@SupportedAnnotationTypes({ "org.springframework.boot.autoconfigureprocessor.TestConfiguration",
-		"org.springframework.boot.autoconfigureprocessor.TestConditionalOnClass",
-		"org.springframework.boot.autoconfigure.condition.TestConditionalOnBean",
-		"org.springframework.boot.autoconfigure.condition.TestConditionalOnSingleCandidate",
-		"org.springframework.boot.autoconfigure.condition.TestConditionalOnWebApplication",
+@SupportedAnnotationTypes({ "org.springframework.boot.autoconfigureprocessor.TestConditionalOnClass",
+		"org.springframework.boot.autoconfigureprocessor.TestConditionalOnBean",
+		"org.springframework.boot.autoconfigureprocessor.TestConditionalOnSingleCandidate",
+		"org.springframework.boot.autoconfigureprocessor.TestConditionalOnWebApplication",
 		"org.springframework.boot.autoconfigureprocessor.TestAutoConfigureBefore",
 		"org.springframework.boot.autoconfigureprocessor.TestAutoConfigureAfter",
 		"org.springframework.boot.autoconfigureprocessor.TestAutoConfigureOrder" })
@@ -47,7 +46,6 @@ public TestAutoConfigureAnnotationProcessor(File outputLocation) {
 
 	@Override
 	protected void addAnnotations(Map<String, String> annotations) {
-		put(annotations, "Configuration", TestConfiguration.class);
 		put(annotations, "ConditionalOnClass", TestConditionalOnClass.class);
 		put(annotations, "ConditionalOnBean", TestConditionalOnBean.class);
 		put(annotations, "ConditionalOnSingleCandidate", TestConditionalOnSingleCandidate.class);

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/TestClassConfiguration.java

@@ -23,7 +23,6 @@
  *
  * @author Madhura Bhave
  */
-@TestConfiguration
 @TestConditionalOnClass(name = { "org.springframework.foo", "java.io.InputStream" },
 		value = TestClassConfiguration.Nested.class)
 @TestConditionalOnBean(type = "java.io.OutputStream")

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/TestConfiguration.java

@@ -23,7 +23,6 @@
  *
  * @author Madhura Bhave
  */
-@TestConfiguration
 public class TestMethodConfiguration {
 
 	@TestConditionalOnClass(name = "java.io.InputStream", value = OutputStream.class)

spring-boot-project/spring-boot-tools/spring-boot-autoconfigure-processor/src/test/java/org/springframework/boot/autoconfigureprocessor/TestMethodConfiguration.java

@@ -21,7 +21,6 @@
  *
  * @author Phillip Webb
  */
-@TestConfiguration
 @TestConditionalOnBean(name = "test", type = "java.io.OutputStream")
 public class TestOnBeanWithNameClassConfiguration {