DATAJDBC-390 - Add ordering to RelationalAuditingEventListener to run before other listeners without explicitly specified order.

When an event listener is used to set an id before saving it, this ensures the auditing happens before setting the id.
If this is not ensured the auditing listener doesn't consider the entity as new and doesn't set created date and created by user.

Original pull request: #159.

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/repository/config/EnableJdbcAuditingHsqlIntegrationTests.java

@@ -28,6 +28,7 @@ import java.util.function.Consumer;
 import org.assertj.core.api.SoftAssertions;
 import org.jetbrains.annotations.NotNull;
 import org.junit.Test;
+import org.springframework.context.ApplicationListener;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
@@ -41,7 +42,9 @@ import org.springframework.data.annotation.LastModifiedDate;
 import org.springframework.data.auditing.DateTimeProvider;
 import org.springframework.data.domain.AuditorAware;
 import org.springframework.data.relational.core.mapping.NamingStrategy;
+import org.springframework.data.relational.core.mapping.event.BeforeSaveEvent;
 import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Component;
 import org.springframework.test.context.ActiveProfiles;
 
 /**
@@ -176,6 +179,23 @@ public class EnableJdbcAuditingHsqlIntegrationTests {
 						});
 	}
 
+	@Test // DATAJDBC-390
+	public void auditingListenerTriggersBeforeDefaultListener() {
+
+		configureRepositoryWith( //
+				AuditingAnnotatedDummyEntityRepository.class, //
+				TestConfiguration.class, //
+				AuditingConfiguration.class, //
+				OrderAssertingEventListener.class) //
+						.accept(repository -> {
+
+							AuditingAnnotatedDummyEntity entity = repository.save(new AuditingAnnotatedDummyEntity());
+
+							assertThat(entity.id).isNotNull();
+
+						});
+	}
+
 	/**
 	 * Usage looks like this:
 	 * <p>
@@ -296,4 +316,20 @@ public class EnableJdbcAuditingHsqlIntegrationTests {
 			return () -> Optional.of("user");
 		}
 	}
+
+	/**
+	 * An event listener asserting that it is running after {@link AuditingConfiguration#auditorAware()} was invoked and
+	 * set the auditing data.
+	 */
+	@Component
+	static class OrderAssertingEventListener implements ApplicationListener<BeforeSaveEvent> {
+
+		@Override
+		public void onApplicationEvent(BeforeSaveEvent event) {
+
+			Object entity = event.getEntity();
+			assertThat(entity).isInstanceOf(AuditingAnnotatedDummyEntity.class);
+			assertThat(((AuditingAnnotatedDummyEntity) entity).createdDate).isNotNull();
+		}
+	}
 }