DATACMNS-1263 - Allow configuration inspection-classloader customization.

We now allow customizing the configuration inspection-classloader with RepositoryConfigurationExtensionSupport.getConfigurationInspectionClassLoader(…). Subclasses may override this method if a customized/isolated classloader is required.

Original pull request: #276.

Author: mp911de

src/main/java/org/springframework/data/repository/config/RepositoryConfigurationExtensionSupport.java

@@ -87,7 +87,8 @@ public <T extends RepositoryConfigurationSource> Collection<RepositoryConfigurat
 		for (BeanDefinition candidate : configSource.getCandidates(loader)) {
 
 			RepositoryConfiguration<T> configuration = getRepositoryConfiguration(candidate, configSource);
-			Class<?> repositoryInterface = loadRepositoryInterface(configuration, loader);
+			Class<?> repositoryInterface = loadRepositoryInterface(configuration,
+					getConfigurationInspectionClassLoader(loader));
 
 			if (repositoryInterface == null) {
 				result.add(configuration);
@@ -113,6 +114,19 @@ public <T extends RepositoryConfigurationSource> Collection<RepositoryConfigurat
 		return result;
 	}
 
+	/**
+	 * Returns the {@link ClassLoader} to load repository interfaces for configuration inspection. Subclasses may override
+	 * this method to provide a customized class loader.
+	 *
+	 * @param loader must not be {@literal null}.
+	 * @return the {@link ClassLoader} for repository interfaces configuration inspection.
+	 * @since 2.1
+	 */
+	@Nullable
+	protected ClassLoader getConfigurationInspectionClassLoader(ResourceLoader loader) {
+		return loader.getClassLoader();
+	}
+
 	/*
 	 * (non-Javadoc)
 	 * @see org.springframework.data.repository.config.RepositoryConfigurationExtension#getDefaultNamedQueryLocation()
@@ -297,17 +311,16 @@ protected boolean useRepositoryConfiguration(RepositoryMetadata metadata) {
 
 	/**
 	 * Loads the repository interface contained in the given {@link RepositoryConfiguration} using the given
-	 * {@link ResourceLoader}.
+	 * {@link ClassLoader}.
 	 *
 	 * @param configuration must not be {@literal null}.
-	 * @param loader must not be {@literal null}.
+	 * @param classLoader must not be {@literal null}.
 	 * @return the repository interface or {@literal null} if it can't be loaded.
 	 */
 	@Nullable
-	private Class<?> loadRepositoryInterface(RepositoryConfiguration<?> configuration, ResourceLoader loader) {
+	private Class<?> loadRepositoryInterface(RepositoryConfiguration<?> configuration, ClassLoader classLoader) {
 
 		String repositoryInterface = configuration.getRepositoryInterface();
-		ClassLoader classLoader = loader.getClassLoader();
 
 		try {
 			return org.springframework.util.ClassUtils.forName(repositoryInterface, classLoader);