You will need to solve that problem. looks like a configuration problem, can you share the persistence.xml file? did you configure persistence with JTA?<div>Cheers<br><br><div class="gmail_quote">2011/11/9 S.M.H.Jamali <span dir="ltr">&lt;<a href="mailto:cpps98@yahoo.com">cpps98@yahoo.com</a>&gt;</span><br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div><div style="color:#000;background-color:#fff;font-family:tahoma, new york, times, serif;font-size:10pt"><div><span>Hello all,</span></div>

<div><br><span></span></div><div><span>I get an exception while last line of below method executed : <br></span></div><div><br><span></span></div><div><span>    public StatefulKnowledgeSession createSession() throws Exception {<br>

        <br>        /*<br>         * Create the knowledgebase using the required bpmn and drl files<br>         */<br>        KnowledgeBase kbase = readKnowledgeBase(&quot;HumanTask.bpmn&quot;);<br>        EntityManagerFactory emf = Persistence.createEntityManagerFactory( &quot;org.jbpm.persistence.jpa&quot; );<br>

        Environment env =
 KnowledgeBaseFactory.newEnvironment();<br>        env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );<br>        env.set( EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager() );<br>

        env.set( EnvironmentName.GLOBALS, new MapGlobalResolver() );<br>        <br>        Properties properties = new Properties();<br>        properties.put(&quot;drools.processInstanceManagerFactory&quot;, &quot;org.jbpm.persistence.processinstance.JPAProcessInstanceManagerFactory&quot;);<br>

        properties.put(&quot;drools.processSignalManagerFactory&quot;, &quot;org.jbpm.persistence.processinstance.JPASignalManagerFactory&quot;);<br>        KnowledgeSessionConfiguration config =
 KnowledgeBaseFactory.newKnowledgeSessionConfiguration(properties);<br>    <br>        return <span style="font-weight:bold;color:rgb(192, 0, 0)">JPAKnowledgeService.newStatefulKnowledgeSession(kbase, config, env);</span><br>

            <br>    }<br></span></div><div> <br>its stack-trace is : <br><br><span style="font-weight:bold">14:26:13,111 WARN  [JtaTransactionManager] Participating in existing JTA transaction, but no JTA TransactionManager or TransactionSychronizationRegistry available: </span><br style="font-weight:bold">

<span style="font-weight:bold">java.lang.NullPointerException</span><br style="font-weight:bold"><span style="font-weight:bold">    at org.drools.persistence.jta.JtaTransactionManager.registerTransactionSynchronization(JtaTransactionManager.java:221)</span><br style="font-weight:bold">

<span style="font-weight:bold">    at org.drools.persistence.SingleSessionCommandService.registerRollbackSync(SingleSessionCommandService.java:333)</span><br style="font-weight:bold"><span style="font-weight:bold">    at org.drools.persistence.SingleSessionCommandService.&lt;init&gt;(SingleSessionCommandService.java:123)</span><br style="font-weight:bold">

<span style="font-weight:bold">    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)</span>...<br><br>Can anyone help me to solve this problem ?<br>Thanks in advance<span class="HOEnZb"><font color="#888888"><span style="font-family:garamond, new york, times, serif;font-weight:bold;color:rgb(0, 0, 127)"><br>

S.M.H.Jamali</span></font></span></div></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br> - CTO @ <a href="http://www.plugtree.com" target="_blank">http://www.plugtree.com</a>  <br> - MyJourney @ <a href="http://salaboy.wordpress.com" target="_blank">http://salaboy.wordpress.com</a><div>

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