EJB Adapter access to EJB Session Bean

Using webM 6.0.1 trying to access EJB Session Bean method from weblogic server. Deployed jar. Added Jar to IS classpath. Added weblogic.jar file to IS classpath. Also added client.jar to weblogic lib path.
But getting this error
EJBServices.retrieveEJB - beanWrap.initializeBean threw this: type(java.lang.NullPointerException), msg(null).

did the webM 601 use the same version of jvm as the app server?