Deprecate spring context indexer

This commit deprecates the context indexer as our efforts on the AOT
engine cover the indexer in a much broader fashion.

Closes gh-30431

framework-docs/modules/ROOT/pages/appendix.adoc

@@ -39,11 +39,6 @@ resolvable otherwise. See
 {api-spring-framework}++/core/env/AbstractEnvironment.html#IGNORE_GETENV_PROPERTY_NAME++[`AbstractEnvironment`]
 for details.
 
-| `spring.index.ignore`
-| Instructs Spring to ignore the components index located in
-`META-INF/spring.components`. See xref:core/beans/classpath-scanning.adoc#beans-scanning-index[Generating an Index of Candidate Components]
-.
-
 | `spring.jdbc.getParameterType.ignore`
 | Instructs Spring to ignore `java.sql.ParameterMetaData.getParameterType` completely.
 See the note in xref:data-access/jdbc/advanced.adoc#jdbc-batch-list[Batch Operations with a List of Objects].

framework-docs/modules/ROOT/pages/core/beans/classpath-scanning.adoc

@@ -989,68 +989,4 @@ metadata is provided per-instance rather than per-class.
 
 
 
-[[beans-scanning-index]]
-== Generating an Index of Candidate Components
-
-While classpath scanning is very fast, it is possible to improve the startup performance
-of large applications by creating a static list of candidates at compilation time. In this
-mode, all modules that are targets of component scanning must use this mechanism.
-
-NOTE: Your existing `@ComponentScan` or `<context:component-scan/>` directives must remain
-unchanged to request the context to scan candidates in certain packages. When the
-`ApplicationContext` detects such an index, it automatically uses it rather than scanning
-the classpath.
-
-To generate the index, add an additional dependency to each module that contains
-components that are targets for component scan directives. The following example shows
-how to do so with Maven:
-
-[source,xml,indent=0,subs="verbatim,quotes,attributes"]
-----
-	<dependencies>
-		<dependency>
-			<groupId>org.springframework</groupId>
-			<artifactId>spring-context-indexer</artifactId>
-			<version>{spring-version}</version>
-			<optional>true</optional>
-		</dependency>
-	</dependencies>
-----
-
-With Gradle 4.5 and earlier, the dependency should be declared in the `compileOnly`
-configuration, as shown in the following example:
-
-[source,groovy,indent=0,subs="verbatim,quotes,attributes"]
-----
-	dependencies {
-		compileOnly "org.springframework:spring-context-indexer:{spring-version}"
-	}
-----
-
-With Gradle 4.6 and later, the dependency should be declared in the `annotationProcessor`
-configuration, as shown in the following example:
-
-[source,groovy,indent=0,subs="verbatim,quotes,attributes"]
-----
-	dependencies {
-		annotationProcessor "org.springframework:spring-context-indexer:{spring-version}"
-	}
-----
-
-The `spring-context-indexer` artifact generates a `META-INF/spring.components` file that
-is included in the jar file.
-
-NOTE: When working with this mode in your IDE, the `spring-context-indexer` must be
-registered as an annotation processor to make sure the index is up-to-date when
-candidate components are updated.
-
-TIP: The index is enabled automatically when a `META-INF/spring.components` file is found
-on the classpath. If an index is partially available for some libraries (or use cases)
-but could not be built for the whole application, you can fall back to a regular classpath
-arrangement (as though no index were present at all) by setting `spring.index.ignore` to
-`true`, either as a JVM system property or via the
-xref:appendix.adoc#appendix-spring-properties[`SpringProperties`] mechanism.
-
-
-
 

spring-context-indexer/src/main/java/org/springframework/context/index/processor/CandidateComponentsIndexer.java

@@ -42,7 +42,9 @@
  * @author Stephane Nicoll
  * @author Juergen Hoeller
  * @since 5.0
+ * @deprecated as of 6.1, in favor of the AOT engine.
  */
+@Deprecated(since = "6.1", forRemoval = true)
 public class CandidateComponentsIndexer implements Processor {
 
 	private MetadataStore metadataStore;

spring-context/src/main/java/org/springframework/context/annotation/ClassPathScanningCandidateComponentProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -86,6 +86,7 @@
  * @see ScannedGenericBeanDefinition
  * @see CandidateComponentsIndex
  */
+@SuppressWarnings("removal") // components index
 public class ClassPathScanningCandidateComponentProvider implements EnvironmentCapable, ResourceLoaderAware {
 
 	static final String DEFAULT_RESOURCE_PATTERN = "**/*.class";

spring-context/src/main/java/org/springframework/context/index/CandidateComponentsIndex.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -45,7 +45,9 @@
  *
  * @author Stephane Nicoll
  * @since 5.0
+ * @deprecated as of 6.1, in favor of the AOT engine.
  */
+@Deprecated(since = "6.1", forRemoval = true)
 public class CandidateComponentsIndex {
 
 	private static final AntPathMatcher pathMatcher = new AntPathMatcher(".");

spring-context/src/main/java/org/springframework/context/index/CandidateComponentsIndexLoader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -38,7 +38,10 @@
  *
  * @author Stephane Nicoll
  * @since 5.0
+ * @deprecated as of 6.1, in favor of the AOT engine.
  */
+@Deprecated(since = "6.1", forRemoval = true)
+@SuppressWarnings("removal")
 public final class CandidateComponentsIndexLoader {
 
 	/**

spring-context/src/test/java/org/springframework/context/index/CandidateComponentsIndexLoaderTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -32,6 +32,8 @@
  *
  * @author Stephane Nicoll
  */
+@Deprecated
+@SuppressWarnings("removal")
 public class CandidateComponentsIndexLoaderTests {
 
 	@Test

spring-context/src/test/java/org/springframework/context/index/CandidateComponentsIndexTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -30,6 +30,8 @@
  *
  * @author Stephane Nicoll
  */
+@Deprecated
+@SuppressWarnings("removal")
 public class CandidateComponentsIndexTests {
 
 	@Test

spring-orm/src/main/java/org/springframework/orm/jpa/persistenceunit/PersistenceManagedTypesScanner.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -52,6 +52,7 @@
  * @author Stephane Nicoll
  * @since 6.0
  */
+@SuppressWarnings("removal") // components index
 public final class PersistenceManagedTypesScanner {
 
 	private static final String CLASS_RESOURCE_PATTERN = "/**/*.class";