User development, A new message was posted in the thread "NullPointerException on Assignment-Handler": http://community.jboss.org/message/520219#520219 Author : Santanu Saraswati Profile : http://community.jboss.org/people/saraswati.santanu Message: -------------------------------------------------------------- Quick note on multiplicity in 4.0 - it was a silly typo that creates that problem. The multiplicity - string is harcoded in JoinBinding. The spelling was wrong. The hardcoded string is "multiplicicty". If use the same string in your jpdl, things will work. This is fixed in later versions. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/520219#520219