How to use UserTransaction in non-EJB code

Question

This is in a class that is called from within a Stateless Session bean. In this class, I'm trying to use a UserTransaction object that is created as follows (taken from Zuffoletto's book):
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env.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
ctx = new InitialContext(env);
tx = (UserTransaction) ctx.lookup("javax.transaction.UserTransaction");
========================================
However, when I call tx.begin(), it throws an exception as follows:
========================================
javax.transaction.NotSupportedException: Another transaction is associated with this thread. Existing transaction Name=[EJB com.bea.wlw.runtime.core.bean.SyncDispatcherBean.invoke
(com.bea.wlw.runtime.core.request.Request)],Xid=BEA1-001123C02690(16658514),Status=Ac
tive,numRepliesOwedMe=0,numRepliesOwedOthers=0,seconds since begin=13,seconds left=43187,activeThread=Thread[ExecuteThread: '12' for
queue: 'weblogic.kernel.Default',5,Thread Group for Queue: 'weblogic.kernel.Default'],SCInfo[workshop+cgServer]=
(state=active),properties=({weblogic.transaction.name=
[EJB com.bea.wlw.runtime.core.bean.SyncDispatcherBean.invoke
(com.bea.wlw.runtime.core.request.Request)]}),OwnerTransactionManager=ServerTM[ServerCoordinatorDescriptor=
(CoordinatorURL=cgServer+192.168.0.73:7001+workshop+t3+, XAResources={},NonXAResources={})])
========================================
Any ideas/suggestions/hints??
Why would this explicitly created tx, being used by one single call be colliding with an existing transaction?
Thanks for your comments.

Answer 1

Hello,
As I understand, you would like to setup a watch folder which will be getting pdf files in arbitrary intervals. You then want each pdf to be converted to ps in a separate folder.
You could achieve this with the help of a script by polling for pdf files present in the watch folder. When you find pdf files, convert them to ps, save the ps file in another folder and then move the pdf to another folder.
In any case, once the process of conversion of pdf to ps is over, acroread will quit.
There is no way to keep the acroread process running in background and convert pdfs as and when they are available.
Please let me know if this answers your query.
Regards,
Rishi