[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-5550?page=c...
]
Zemian Deng commented on HHH-5550:
----------------------------------
Hi there,
Yes the 3.6 version with "session.getLobHelper().createBlob( bytes )" does
works. Thanks.
I have two additional feedbacks though:
1) In 3.6, even Hibernate.createBlob(blobBytes, session); is marked as deprecated, but if
used, it still produces the same exception mentioned here. So in this case, it's not
just deprecated, but it's broken. (Granted that it only for Thread context scenerio,
but still a bit annoying.).
2) In 3.6, the javadoc on Hibernate.createBlob(blobBytes, session) says: "@deprecated
Use {@link LobHelper#createBlob(byte[])} instead." Now this is not very good hint
since LobHelper is an interface and the only implementation is a private inner class. It
would be more helpful to let user know that they need to get this impl instance by session
instance like "session.getLobHelper().createBlob( bytes )".
Hope this helps,
Zemian Deng
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
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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