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

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 Assignee: Steve Ebersole Fix For: 3.6.1 Time Spent: 1.3h Remaining Estimate: 0h 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.