Hi, trying the same thing in JBoss where I can get the stacktrace, I get... | 11:04:39,281 WARN [ProxyWarnLog] Narrowing proxy to class org.jbpm.graph.node.TaskNode - this operation breaks == | 11:04:39,414 ERROR [Delegation] couldn't load delegation class 'DatacentreAssignmentHandler' | java.lang.ClassNotFoundException: class 'DatacentreAssignmentHandler' could not be found by the process classloader | ...... | ...... | 11:04:39,442 ERROR [Delegation] couldn't instantiate delegation class 'DatacentreAssignmentHandler' | java.lang.NullPointerException | this leads me to believe that I am deploying my handler in the wrong way, namely I am just dropping the class file, in its folder structure manually under WEB-INF/classes in my web app... I guess I should be deploying it from within the designer plugin ? How should I be deploying a custom assignment handler? Thanks for your help, regards, Ross View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4074773#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...