[OPENJPA-2484] JPA-QL query with byte[] projection fails.

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.2.2
• Component/s: jpa
• Assignee: Unassigned
• Reporter: Thomas Darimont
• Created: 24/Mar/14 07:52
• Updated: 25/Nov/19 13:47

Description

Given a User entity with a persistent byte[] field declared as:
@Lob private byte[] binaryData;

When executing the following JPA query:
select u.binaryData from User u where u.id = :id

	User user = new User();
		user.setBinaryData("TEST".getBytes());

		em.persist(user);

		Object result = em.createQuery("select u.binaryData from User u where u.id = :id").setParameter("id", user.getId())
				.getSingleResult();
                assertThat(result,is(notNullValue()));

The following exception is thrown:

<openjpa-2.3.0-r422266:1540826 nonfatal user error> org.apache.openjpa.persistence.ArgumentException: Query projections cannot include array, collection, or map fields.  Invalid query: "select u.binaryData from User u where u.id = :id"
	at org.apache.openjpa.kernel.ExpressionStoreQuery$AbstractExpressionExecutor.assertNotContainer(ExpressionStoreQuery.java:328)
	at org.apache.openjpa.kernel.ExpressionStoreQuery$DataStoreExecutor.<init>(ExpressionStoreQuery.java:770)
	at org.apache.openjpa.kernel.ExpressionStoreQuery.newDataStoreExecutor(ExpressionStoreQuery.java:179)
	at org.apache.openjpa.kernel.QueryImpl.createExecutor(QueryImpl.java:749)
	at org.apache.openjpa.kernel.QueryImpl.compileForDataStore(QueryImpl.java:707)
	at org.apache.openjpa.kernel.QueryImpl.compileForExecutor(QueryImpl.java:689)
	at org.apache.openjpa.kernel.QueryImpl.compile(QueryImpl.java:589)
	at org.apache.openjpa.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:997)
	at org.apache.openjpa.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:979)
	at org.apache.openjpa.persistence.EntityManagerImpl.createQuery(EntityManagerImpl.java:102)
	at org.example.domain.OpenJpaPlainJpaTests.foo(OpenJpaPlainJpaTests.java:301)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Other JPA implementations like Hibernate or EclipseLink support this.