[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5550) Hibernate.createBlob() fails when used in current_session_context_class=thread mode

[Gail Badner (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=39425#action_39425 ] 

Gail Badner commented on HHH-5550:
----------------------------------

I believe this would also affect sessions obtained from ManagedSessionContext.currentSession() and JTASessionContext.currentSession(), which return org.hibernate.classic.Session, because that does not extend LobCreationContext either.

In 3.6, session.getLobHelper().createBlob( bytes ), should be used instead.

Zemian, could you give 3.6.0 a try?

Thanks,
Gail


> Hibernate.createBlob() fails when used in current_session_context_class=thread mode
> -----------------------------------------------------------------------------------
>
>                 Key: HHH-5550
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5550
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.5.5
>            Reporter: Zemian Deng
>
> See https://forum.hibernate.org/viewtopic.php?f=1&t=1004366
> Here is a unit test failed case:
> {code:java}
> package deng.hibernate.examples.blob;
> import org.hibernate.*;
> import org.hibernate.cfg.*;
> import org.junit.Test;
> public class HibernateCreateBlobFailedCase {
> 		
> 	@Test
> 	public void createBlob() {
> 		Configuration cfg = new Configuration();
> 		SessionFactory sessionFactory = cfg.configure().buildSessionFactory();
> 		Session session = sessionFactory.getCurrentSession();
> 		Transaction tx = null;
> 		try {
> 			tx = session.beginTransaction();
> 			byte[] blobBytes = new byte[]{};
> 			Hibernate.createBlob(blobBytes, session);
> 		} catch (Throwable e) {
> 			tx.rollback();
> 			throw new RuntimeException(e);
> 		} finally {
> 			sessionFactory.close();
> 		}
> 	}
> 	
> }
> {code}
> Set hibernate.cfg.xml with thread session context
> {code:xml}
> ...
> <property name="current_session_context_class">thread</property>
> ...
> {code}
> You will get this stack trace
> {noformat}
> java.lang.RuntimeException: java.lang.ClassCastException: $Proxy4 cannot be cast to org.hibernate.engine.jdbc.LobCreationContext
> 	at deng.hibernate.examples.blob.HibernateCreateBlobFailedCase.createBlob(HibernateCreateBlobFailedCase.java:24)
> 	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:44)
> 	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
> 	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
> 	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
> 	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
> 	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
> 	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
> 	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
> 	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
> 	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
> 	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
> 	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
> 	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
> 	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)
> Caused by: java.lang.ClassCastException: $Proxy4 cannot be cast to org.hibernate.engine.jdbc.LobCreationContext
> 	at org.hibernate.Hibernate.getLobCreator(Hibernate.java:502)
> 	at org.hibernate.Hibernate.getLobCreator(Hibernate.java:498)
> 	at org.hibernate.Hibernate.createBlob(Hibernate.java:494)
> 	at deng.hibernate.examples.blob.HibernateCreateBlobFailedCase.createBlob(HibernateCreateBlobFailedCase.java:21)
> 	... 22 more
> {noformat}
> As described in forum, this problem occurred because the session object we get using {{sessionFactory.getCurrentSession();}} is an wrapped ThreadLocalSessionContext instance that can not be cast into LobCreationContext. There is no easy way to unwrap and get the original session object, to pass to createBlob method.

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