Allow overriding DateTimeProvider via Bean Definition

use autowired properties for AuditorAware and DateTimeProvider when explicit references are not provided

See: #3177

Signed-off-by: JaeYeon Kim <ghgh415263@naver.com>

Author: ghgh415263

src/main/java/org/springframework/data/auditing/config/AuditingBeanDefinitionRegistrarSupport.java

@@ -21,15 +21,13 @@
 
 import org.springframework.aop.framework.ProxyFactoryBean;
 import org.springframework.aop.target.LazyInitTargetSource;
-import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.support.AbstractBeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
 import org.springframework.core.type.AnnotationMetadata;
 import org.springframework.data.auditing.AuditingHandler;
-import org.springframework.data.auditing.CurrentDateTimeProvider;
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
@@ -42,6 +40,7 @@
  * @author Thomas Darimont
  * @author Oliver Gierke
  * @author Francisco Soler
+ * @author Jaeyeon Kim
  */
 public abstract class AuditingBeanDefinitionRegistrarSupport implements ImportBeanDefinitionRegistrar {
 
@@ -117,20 +116,18 @@ protected BeanDefinitionBuilder getAuditHandlerBeanDefinitionBuilder(AuditingCon
 	protected BeanDefinitionBuilder configureDefaultAuditHandlerAttributes(AuditingConfiguration configuration,
 			BeanDefinitionBuilder builder) {
 
+		builder.setAutowireMode(AbstractBeanDefinition.AUTOWIRE_BY_TYPE);
+
 		if (StringUtils.hasText(configuration.getAuditorAwareRef())) {
 			builder.addPropertyValue(AUDITOR_AWARE,
 					createLazyInitTargetSourceBeanDefinition(configuration.getAuditorAwareRef()));
-		} else {
-			builder.setAutowireMode(AutowireCapableBeanFactory.AUTOWIRE_BY_TYPE);
 		}
 
 		builder.addPropertyValue(SET_DATES, configuration.isSetDates());
 		builder.addPropertyValue(MODIFY_ON_CREATE, configuration.isModifyOnCreate());
 
 		if (StringUtils.hasText(configuration.getDateTimeProviderRef())) {
 			builder.addPropertyReference(DATE_TIME_PROVIDER, configuration.getDateTimeProviderRef());
-		} else {
-			builder.addPropertyValue(DATE_TIME_PROVIDER, CurrentDateTimeProvider.INSTANCE);
 		}
 
 		builder.setRole(AbstractBeanDefinition.ROLE_INFRASTRUCTURE);