DATAJPA-568 - Fix is-new detection for primitive version properties.

Some persistence providers do not bump the version number in an initial call to EntityManager.persist(…). Thus, in case of a primitive version property we cannot distinguish between a new entity and one already persisted. We now fall back to id inspection whenever we find a primitive version property.

Original pull request: #103.

src/main/java/org/springframework/data/jpa/repository/support/JpaMetamodelEntityInformation.java

@@ -43,6 +43,7 @@ import org.springframework.util.Assert;
  * 
  * @author Oliver Gierke
  * @author Thomas Darimont
+ * @author Christoph Strobl
  */
 public class JpaMetamodelEntityInformation<T, ID extends Serializable> extends JpaEntityInformationSupport<T, ID> {
 
@@ -192,7 +193,7 @@ public class JpaMetamodelEntityInformation<T, ID extends Serializable> extends J
 	@Override
 	public boolean isNew(T entity) {
 
-		if (versionAttribute == null) {
+		if (versionAttribute == null || versionAttribute.getJavaType().isPrimitive()) {
 			return super.isNew(entity);
 		}
 
@@ -203,7 +204,7 @@ public class JpaMetamodelEntityInformation<T, ID extends Serializable> extends J
 			return true;
 		}
 
-		return versionAttribute.getJavaType().isPrimitive() && ((Number) versionValue).longValue() == 0;
+		return ((Number) versionValue).longValue() == 0;
 	}
 
 	/**

src/test/java/org/springframework/data/jpa/domain/sample/PrimitiveVersionProperty.java

@@ -1,12 +1,34 @@
+/*
+ * Copyright 2014 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.springframework.data.jpa.domain.sample;
 
 import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
 import javax.persistence.Version;
 
+/**
+ * @author Oliver Gierke
+ * @author Christoph Strobl
+ */
 @Entity
 public class PrimitiveVersionProperty {
 
-	@Id Long id;
-	@Version long version;
+	public @Id @GeneratedValue Long id;
+	public @Version long version;
+
+	public String someValue;
 }

src/test/java/org/springframework/data/jpa/repository/support/JpaMetamodelEntityInformationIntegrationTests.java

@@ -52,6 +52,7 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
  * 
  * @author Oliver Gierke
  * @author Thomas Darimont
+ * @author Christoph Strobl
  */
 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration({ "classpath:infrastructure.xml" })
@@ -182,6 +183,39 @@ public class JpaMetamodelEntityInformationIntegrationTests {
 		assertThat(information.isNew(new PrimitiveVersionProperty()), is(true));
 	}
 
+	/**
+	 * @see DATAJPA-568
+	 */
+	@Test
+	public void considersEntityAsNotNewWhenHavingIdSetAndUsingPrimitiveTypeForVersionProperty() {
+
+		EntityInformation<PrimitiveVersionProperty, Serializable> information = new JpaMetamodelEntityInformation<PrimitiveVersionProperty, Serializable>(
+				PrimitiveVersionProperty.class, em.getMetamodel());
+
+		PrimitiveVersionProperty pvp = new PrimitiveVersionProperty();
+		pvp.id = 100L;
+
+		assertThat(information.isNew(pvp), is(false));
+	}
+
+	/**
+	 * @see DATAJPA-568
+	 */
+	@Test
+	public void fallsBackToIdInspectionForAPrimitiveVersionProperty() {
+
+		EntityInformation<PrimitiveVersionProperty, Serializable> information = new JpaMetamodelEntityInformation<PrimitiveVersionProperty, Serializable>(
+				PrimitiveVersionProperty.class, em.getMetamodel());
+
+		PrimitiveVersionProperty pvp = new PrimitiveVersionProperty();
+		pvp.version = 1L;
+
+		assertThat(information.isNew(pvp), is(true));
+
+		pvp.id = 1L;
+		assertThat(information.isNew(pvp), is(false));
+	}
+
 	protected String getMetadadataPersitenceUnitName() {
 		return "metadata";
 	}
@@ -207,4 +241,5 @@ public class JpaMetamodelEntityInformationIntegrationTests {
 	public static class Sample extends Identifiable {
 
 	}
+
 }