User development, A new message was posted in the thread "NullPointerException on Assignment-Handler": http://community.jboss.org/message/520062#520062 Author : Gert Leenders Profile : http://community.jboss.org/people/gleenders Message: -------------------------------------------------------------- The verry same problem occured in my program which uses JBPM 4.2. Just re-installed JBPM 4.0 and everything works fine now (except for the multiplicity )   Regards, Gert -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/520062#520062