HHH-8486 - javax.persistence.Tuple#get(String,Class) impl does not validate type

Author: sebersole

hibernate-entitymanager/src/main/java/org/hibernate/jpa/spi/AbstractEntityManagerImpl.java

@@ -481,7 +481,20 @@ public HqlTupleImpl(Object[] tuple) {
 
 			@Override
 			public <X> X get(String alias, Class<X> type) {
-				return (X) get( alias );
+				final Object untyped = get( alias );
+				if ( untyped != null ) {
+					if ( ! type.isInstance( untyped ) ) {
+						throw new IllegalArgumentException(
+								String.format(
+										"Requested tuple value [alias=%s, value=%s] cannot be assigned to requested type [%s]",
+										alias,
+										untyped,
+										type.getName()
+								)
+						);
+					}
+				}
+				return (X) untyped;
 			}
 
 			@Override
@@ -655,7 +668,20 @@ public Object get(String alias) {
 			}
 
 			public <X> X get(String alias, Class<X> type) {
-				return ( X ) get( alias );
+				final Object untyped = get( alias );
+				if ( untyped != null ) {
+					if ( ! type.isInstance( untyped ) ) {
+						throw new IllegalArgumentException(
+								String.format(
+										"Requested tuple value [alias=%s, value=%s] cannot be assigned to requested type [%s]",
+										alias,
+										untyped,
+										type.getName()
+								)
+						);
+					}
+				}
+				return (X) untyped;
 			}
 
 			public Object get(int i) {

hibernate-entitymanager/src/test/java/org/hibernate/jpa/test/criteria/tuple/TupleCriteriaTest.java

@@ -23,6 +23,7 @@
  */
 package org.hibernate.jpa.test.criteria.tuple;
 
+import java.util.Date;
 import java.util.List;
 import javax.persistence.EntityManager;
 import javax.persistence.Tuple;
@@ -38,8 +39,8 @@
 import org.hibernate.jpa.test.metamodel.Customer;
 import org.hibernate.jpa.test.metamodel.Customer_;
 
-import static org.hibernate.testing.junit4.ExtraAssertions.assertTyping;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
@@ -145,6 +146,52 @@ public void testIllegalArgumentExceptionBuildingTupleWithSameAliases() {
 		em.close();
 	}
 
+	@Test
+	public void testVariousTupleAccessMethods() {
+		EntityManager em = entityManagerFactory().createEntityManager();
+		em.getTransaction().begin();
+		Customer c1 = new Customer();
+		c1.setId( "c1" );
+		c1.setAge( 18 );
+		c1.setName( "Bob" );
+		em.persist( c1 );
+		em.getTransaction().commit();
+		em.close();
+
+		em = entityManagerFactory().createEntityManager();
+		em.getTransaction().begin();
+
+		final CriteriaBuilder builder = em.getCriteriaBuilder();
+		CriteriaQuery<Tuple> criteria = builder.createTupleQuery();
+		Root<Customer> customerRoot = criteria.from( Customer.class );
+		Path<String> namePath = customerRoot.get( Customer_.name );
+		namePath.alias( "NAME" );
+		Path<Integer> agePath = customerRoot.get( Customer_.age );
+		agePath.alias( "AGE" );
+		criteria.multiselect( namePath, agePath );
+
+		List<Tuple> results = em.createQuery( criteria ).getResultList();
+		Tuple tuple = results.get( 0 );
+		assertNotNull( tuple );
+		assertNotNull( tuple.get( "NAME" ) );
+		assertNotNull( tuple.get( "NAME", String.class ) );
+		try {
+			tuple.get( "NAME", Date.class );
+			fail( "Accessing Customer#name tuple as Date should have thrown exception" );
+		}
+		catch (IllegalArgumentException expected) {
+		}
+
+		em.getTransaction().commit();
+		em.close();
+
+		em = entityManagerFactory().createEntityManager();
+		em.getTransaction().begin();
+		em.createQuery( "delete Customer" ).executeUpdate();
+		em.getTransaction().commit();
+		em.close();
+	}
+
 	@Test
 	public void testIllegalArgumentExceptionBuildingSelectArrayWithSameAliases() {
 		EntityManager em = entityManagerFactory().createEntityManager();