Polish ApplicationContextFailureProcessor support

See gh-29387

Author: sbrannen

spring-test/src/main/java/org/springframework/test/context/ApplicationContextFailureProcessor.java

@@ -22,6 +22,10 @@
  * Strategy for components that process failures related to application contexts
  * within the <em>Spring TestContext Framework</em>.
  *
+ * <p>Implementations must be registered via the
+ * {@link org.springframework.core.io.support.SpringFactoriesLoader SpringFactoriesLoader}
+ * mechanism.
+ *
  * @author Sam Brannen
  * @since 6.0
  * @see ContextLoadException
@@ -32,9 +36,10 @@ public interface ApplicationContextFailureProcessor {
 	 * Invoked when a failure was encountered while attempting to load an
 	 * {@link ApplicationContext}.
 	 * <p>Implementations of this method must not throw any exceptions. Consequently,
-	 * any exception thrown by an implementation of this method will be ignored.
+	 * any exception thrown by an implementation of this method will be ignored, though
+	 * potentially logged.
 	 * @param context the application context that did not load successfully
-	 * @param exception the exception caught while loading the application context
+	 * @param exception the exception thrown while loading the application context
 	 */
 	void processLoadFailure(ApplicationContext context, Throwable exception);
 

spring-test/src/main/java/org/springframework/test/context/CacheAwareContextLoaderDelegate.java

@@ -66,6 +66,12 @@ default boolean isContextLoaded(MergedContextConfiguration mergedContextConfigur
 	 * configured in the given {@code MergedContextConfiguration}.
 	 * <p>If the context is present in the {@code ContextCache} it will simply
 	 * be returned; otherwise, it will be loaded, stored in the cache, and returned.
+	 * <p>As of Spring Framework 6.0, implementations of this method should load
+	 * {@link ApplicationContextFailureProcessor} implementations via the
+	 * {@link org.springframework.core.io.support.SpringFactoriesLoader SpringFactoriesLoader}
+	 * mechanism, catch any exception thrown by the {@link ContextLoader}, and
+	 * delegate to each of the configured failure processors to process the context
+	 * load failure if the thrown exception is an instance of {@link ContextLoadException}.
 	 * <p>The cache statistics should be logged by invoking
 	 * {@link org.springframework.test.context.cache.ContextCache#logStatistics()}.
 	 * @param mergedContextConfiguration the merged context configuration to use

spring-test/src/main/java/org/springframework/test/context/cache/DefaultCacheAwareContextLoaderDelegate.java

@@ -61,14 +61,15 @@ public class DefaultCacheAwareContextLoaderDelegate implements CacheAwareContext
 
 	private static final Log logger = LogFactory.getLog(DefaultCacheAwareContextLoaderDelegate.class);
 
-	private static List<ApplicationContextFailureProcessor> contextFailureProcessors =
-			getApplicationContextFailureProcessors();
 
 	/**
 	 * Default static cache of Spring application contexts.
 	 */
 	static final ContextCache defaultContextCache = new DefaultContextCache();
 
+	private List<ApplicationContextFailureProcessor> contextFailureProcessors =
+			loadApplicationContextFailureProcessors();
+
 	private final AotTestContextInitializers aotTestContextInitializers = new AotTestContextInitializers();
 
 	private final ContextCache contextCache;
@@ -127,7 +128,7 @@ public ApplicationContext loadContext(MergedContextConfiguration mergedContextCo
 					Throwable cause = ex;
 					if (ex instanceof ContextLoadException cle) {
 						cause = cle.getCause();
-						for (ApplicationContextFailureProcessor contextFailureProcessor : contextFailureProcessors) {
+						for (ApplicationContextFailureProcessor contextFailureProcessor : this.contextFailureProcessors) {
 							try {
 								contextFailureProcessor.processLoadFailure(cle.getApplicationContext(), cause);
 							}
@@ -259,7 +260,7 @@ private MergedContextConfiguration replaceIfNecessary(MergedContextConfiguration
 	 * @return the context failure processors to use
 	 * @since 6.0
 	 */
-	private static List<ApplicationContextFailureProcessor> getApplicationContextFailureProcessors() {
+	private static List<ApplicationContextFailureProcessor> loadApplicationContextFailureProcessors() {
 		SpringFactoriesLoader loader = SpringFactoriesLoader.forDefaultResourceLocation(
 				DefaultCacheAwareContextLoaderDelegate.class.getClassLoader());
 		List<ApplicationContextFailureProcessor> processors = loader.load(ApplicationContextFailureProcessor.class,