createObject method of ObjectFactoryImpl class is not thread safe

Code:

public Object createObject(ObjectInfo objectInfo)

{ clearRegistry(); return getObject(objectInfo); }

This can cause errors like

java.lang.RuntimeException: closed JbpmContext more then once... check your try-finally's around JbpmContexts blocks
at org.jbpm.JbpmContext.popThisContextFromTheStack(JbpmContext.java:493)
at org.jbpm.JbpmContext.close(JbpmContext.java:139)

due to bad context creation when calling JbpmConfiguration.createJbpmContext from a lot of different threads

It's difficult to produce, so try adding a sleep call after clearRegistry() in createObject method, and you will see the problem ...

I think adding a synchronized will correct the bug.

Code:

public synchronized Object createObject(ObjectInfo objectInfo) { clearRegistry(); return getObject(objectInfo); }

Regards,

Emmanuel