Move ManagementContextConfiguration from spring.factories

The import selector will now, in addition to spring.factories, look for
ManagementContextConfiguration classes in a file called
META-INF/spring/org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration.imports

The existing ManagementContextConfigurations have been moved from
spring.factories to the new file.

Closes gh-29730

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -31,9 +31,7 @@ import org.springframework.core.annotation.Order;
 /**
  * Specialized {@link Configuration @Configuration} class that defines configuration
  * specific for the management context. Configurations should be registered in
- * {@code /META-INF/spring.factories} under the
- * {@code org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration}
- * key.
+ * {@code /META-INF/spring/org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration.imports}.
  * <p>
  * {@code ManagementContextConfiguration} classes can be ordered using
  * {@link Order @Order}. Ordering by implementing {@link Ordered} is not supported and

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -24,6 +24,7 @@ import java.util.Map;
 import org.springframework.beans.factory.BeanClassLoaderAware;
 import org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration;
 import org.springframework.boot.actuate.autoconfigure.web.ManagementContextType;
+import org.springframework.boot.context.annotation.ImportCandidates;
 import org.springframework.context.annotation.DeferredImportSelector;
 import org.springframework.core.OrderComparator;
 import org.springframework.core.Ordered;
@@ -36,14 +37,15 @@ import org.springframework.util.StringUtils;
 
 /**
  * Selects configuration classes for the management context configuration. Entries are
- * loaded from {@code /META-INF/spring.factories} under the
- * {@code org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration}
- * key.
+ * loaded from
+ * {@code /META-INF/spring/org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration.imports}.
  *
  * @author Dave Syer
  * @author Phillip Webb
  * @author Andy Wilkinson
+ * @author Moritz Halbritter
  * @see ManagementContextConfiguration
+ * @see ImportCandidates
  */
 @Order(Ordered.LOWEST_PRECEDENCE)
 class ManagementContextConfigurationImportSelector implements DeferredImportSelector, BeanClassLoaderAware {
@@ -88,7 +90,10 @@ class ManagementContextConfigurationImportSelector implements DeferredImportSele
 	}
 
 	protected List<String> loadFactoryNames() {
-		return SpringFactoriesLoader.loadFactoryNames(ManagementContextConfiguration.class, this.classLoader);
+		List<String> factoryNames = new ArrayList<>(
+				SpringFactoriesLoader.loadFactoryNames(ManagementContextConfiguration.class, this.classLoader));
+		ImportCandidates.load(ManagementContextConfiguration.class, this.classLoader).forEach(factoryNames::add);
+		return factoryNames;
 	}
 
 	@Override

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -1,14 +1,2 @@
-org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration=\
-org.springframework.boot.actuate.autoconfigure.endpoint.web.ServletEndpointManagementContextConfiguration,\
-org.springframework.boot.actuate.autoconfigure.endpoint.web.reactive.WebFluxEndpointManagementContextConfiguration,\
-org.springframework.boot.actuate.autoconfigure.endpoint.web.servlet.WebMvcEndpointManagementContextConfiguration,\
-org.springframework.boot.actuate.autoconfigure.endpoint.web.jersey.JerseyWebEndpointManagementContextConfiguration,\
-org.springframework.boot.actuate.autoconfigure.security.servlet.SecurityRequestMatchersManagementContextConfiguration,\
-org.springframework.boot.actuate.autoconfigure.web.jersey.JerseySameManagementContextConfiguration,\
-org.springframework.boot.actuate.autoconfigure.web.jersey.JerseyChildManagementContextConfiguration,\
-org.springframework.boot.actuate.autoconfigure.web.reactive.ReactiveManagementChildContextConfiguration,\
-org.springframework.boot.actuate.autoconfigure.web.servlet.ServletManagementChildContextConfiguration,\
-org.springframework.boot.actuate.autoconfigure.web.servlet.WebMvcEndpointChildContextConfiguration
-
 org.springframework.boot.diagnostics.FailureAnalyzer=\
 org.springframework.boot.actuate.autoconfigure.metrics.ValidationFailureAnalyzer

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/resources/META-INF/spring/org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration.imports

@@ -0,0 +1,10 @@
+org.springframework.boot.actuate.autoconfigure.endpoint.web.ServletEndpointManagementContextConfiguration
+org.springframework.boot.actuate.autoconfigure.endpoint.web.reactive.WebFluxEndpointManagementContextConfiguration
+org.springframework.boot.actuate.autoconfigure.endpoint.web.servlet.WebMvcEndpointManagementContextConfiguration
+org.springframework.boot.actuate.autoconfigure.endpoint.web.jersey.JerseyWebEndpointManagementContextConfiguration
+org.springframework.boot.actuate.autoconfigure.security.servlet.SecurityRequestMatchersManagementContextConfiguration
+org.springframework.boot.actuate.autoconfigure.web.jersey.JerseySameManagementContextConfiguration
+org.springframework.boot.actuate.autoconfigure.web.jersey.JerseyChildManagementContextConfiguration
+org.springframework.boot.actuate.autoconfigure.web.reactive.ReactiveManagementChildContextConfiguration
+org.springframework.boot.actuate.autoconfigure.web.servlet.ServletManagementChildContextConfiguration
+org.springframework.boot.actuate.autoconfigure.web.servlet.WebMvcEndpointChildContextConfiguration

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -16,7 +16,9 @@
 
 package org.springframework.boot.actuate.autoconfigure.web.server;
 
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -24,6 +26,7 @@ import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.actuate.autoconfigure.web.ManagementContextConfiguration;
 import org.springframework.boot.actuate.autoconfigure.web.ManagementContextType;
+import org.springframework.boot.context.annotation.ImportCandidates;
 import org.springframework.core.annotation.Order;
 import org.springframework.core.type.AnnotationMetadata;
 
@@ -58,6 +61,22 @@ class ManagementContextConfigurationImportSelectorTests {
 		assertThat(imports).containsExactlyInAnyOrder(ChildOnly.class.getName(), A.class.getName());
 	}
 
+	@Test
+	void selectImportsLoadsFromResources() {
+		String[] imports = new ManagementContextConfigurationImportSelector()
+				.selectImports(AnnotationMetadata.introspect(EnableChildContext.class));
+		Set<String> expected = new HashSet<>();
+		ImportCandidates
+				.load(ManagementContextConfiguration.class,
+						ManagementContextConfigurationImportSelectorTests.class.getClassLoader())
+				.forEach(expected::add);
+		// Remove JerseySameManagementContextConfiguration, as it specifies
+		// ManagementContextType.SAME and we asked for ManagementContextType.CHILD
+		expected.remove(
+				"org.springframework.boot.actuate.autoconfigure.web.jersey.JerseySameManagementContextConfiguration");
+		assertThat(imports).containsExactlyInAnyOrderElementsOf(expected);
+	}
+
 	private static final class TestManagementContextConfigurationsImportSelector
 			extends ManagementContextConfigurationImportSelector {
 

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

@@ -23,13 +23,14 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.boot.context.annotation.ImportCandidates;
 import org.springframework.context.annotation.Import;
 import org.springframework.core.annotation.AliasFor;
 
 /**
  * Import and apply the specified auto-configuration classes. Applies the same ordering
  * rules as {@code @EnableAutoConfiguration} but restricts the auto-configuration classes
- * to the specified set, rather than consulting {@code spring.factories}.
+ * to the specified set, rather than consulting {@link ImportCandidates}.
  * <p>
  * Can also be used to {@link #exclude()} specific auto-configuration classes such that
  * they will never be applied.