DATACMNS-1367 - Improved debug logging to better identify scanning and initialization of repositories.

Added debug logging in RepositoryFactorySupport and RepositoryConfigurationDelegate so that the scanning and the instantiation of repositories can be a lot easier identified in the logs.

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

@@ -15,13 +15,14 @@
  */
 package org.springframework.data.repository.config;
 
+import lombok.extern.slf4j.Slf4j;
+
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 import javax.annotation.Nullable;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.parsing.BeanComponentDefinition;
 import org.springframework.beans.factory.support.AbstractBeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
@@ -43,10 +44,9 @@ import org.springframework.util.Assert;
  * @author Oliver Gierke
  * @author Jens Schauder
  */
+@Slf4j
 public class RepositoryConfigurationDelegate {
 
-	private static final Logger LOGGER = LoggerFactory.getLogger(RepositoryConfigurationDelegate.class);
-
 	private static final String REPOSITORY_REGISTRATION = "Spring Data {} - Registering repository: {} - Interface: {} - Factory: {}";
 	private static final String MULTIPLE_MODULES = "Multiple Spring Data modules found, entering strict repository configuration mode!";
 
@@ -117,6 +117,11 @@ public class RepositoryConfigurationDelegate {
 				environment);
 		List<BeanComponentDefinition> definitions = new ArrayList<>();
 
+		if (LOG.isDebugEnabled()) {
+			LOG.debug("Scanning for repositories in packages {}.",
+					configurationSource.getBasePackages().stream().collect(Collectors.joining(", ")));
+		}
+
 		for (RepositoryConfiguration<? extends RepositoryConfigurationSource> configuration : extension
 				.getRepositoryConfigurations(configurationSource, resourceLoader, inMultiStoreMode)) {
 
@@ -133,9 +138,9 @@ public class RepositoryConfigurationDelegate {
 			AbstractBeanDefinition beanDefinition = definitionBuilder.getBeanDefinition();
 			String beanName = configurationSource.generateBeanName(beanDefinition);
 
-			if (LOGGER.isDebugEnabled()) {
-				LOGGER.debug(REPOSITORY_REGISTRATION, extension.getModuleName(), beanName,
-						configuration.getRepositoryInterface(), configuration.getRepositoryFactoryBeanClassName());
+			if (LOG.isDebugEnabled()) {
+				LOG.debug(REPOSITORY_REGISTRATION, extension.getModuleName(), beanName, configuration.getRepositoryInterface(),
+						configuration.getRepositoryFactoryBeanClassName());
 			}
 
 			beanDefinition.setAttribute(FACTORY_BEAN_OBJECT_TYPE, configuration.getRepositoryInterface());
@@ -144,6 +149,10 @@ public class RepositoryConfigurationDelegate {
 			definitions.add(new BeanComponentDefinition(beanDefinition, beanName));
 		}
 
+		if (LOG.isDebugEnabled()) {
+			LOG.debug("Finished repository scanning.");
+		}
+
 		return definitions;
 	}
 
@@ -160,7 +169,7 @@ public class RepositoryConfigurationDelegate {
 				.loadFactoryNames(RepositoryFactorySupport.class, resourceLoader.getClassLoader()).size() > 1;
 
 		if (multipleModulesFound) {
-			LOGGER.info(MULTIPLE_MODULES);
+			LOG.info(MULTIPLE_MODULES);
 		}
 
 		return multipleModulesFound;

src/main/java/org/springframework/data/repository/core/support/RepositoryFactorySupport.java

@@ -20,6 +20,7 @@ import lombok.Getter;
 import lombok.NonNull;
 import lombok.RequiredArgsConstructor;
 import lombok.Value;
+import lombok.extern.slf4j.Slf4j;
 
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
@@ -78,6 +79,7 @@ import org.springframework.util.ConcurrentReferenceHashMap.ReferenceType;
  * @author Christoph Strobl
  * @author Jens Schauder
  */
+@Slf4j
 public abstract class RepositoryFactorySupport implements BeanClassLoaderAware, BeanFactoryAware {
 
 	private static final BiFunction<Method, Object[], Object[]> REACTIVE_ARGS_CONVERTER = (method, o) -> {
@@ -287,6 +289,10 @@ public abstract class RepositoryFactorySupport implements BeanClassLoaderAware,
 	@SuppressWarnings({ "unchecked" })
 	public <T> T getRepository(Class<T> repositoryInterface, RepositoryFragments fragments) {
 
+		if (LOG.isDebugEnabled()) {
+			LOG.debug("Initializing repository instance for {}…", repositoryInterface.getName());
+		}
+
 		Assert.notNull(repositoryInterface, "Repository interface must not be null!");
 		Assert.notNull(fragments, "RepositoryFragments must not be null!");
 
@@ -320,7 +326,13 @@ public abstract class RepositoryFactorySupport implements BeanClassLoaderAware,
 		composition = composition.append(RepositoryFragment.implemented(target));
 		result.addAdvice(new ImplementationMethodExecutionInterceptor(composition));
 
-		return (T) result.getProxy(classLoader);
+		T repository = (T) result.getProxy(classLoader);
+
+		if (LOG.isDebugEnabled()) {
+			LOG.debug("Finished creation of repository instance for {}.", repositoryInterface.getName());
+		}
+
+		return repository;
 	}
 
 	/**