Yash, you receive the NPE because you don't have an actors attribute in your mail action. In the docu, 16.1.1 it says anonymous wrote : There are two attribute to specify recipients: actors and to. The to attribute should resolve to a semicolon separated list of email addresses. The actors attribute should resolve to a semicolon separated list of actorIds. Those actorIds will be resolved to email addresses with by means of address resolving. Although to me it sounds more like one has to specify actors OR to, if you look at the code both are getting checked. I've tried with your process, altered only this <mail name="M_MailAction" to=&quot;martin(a)mputz.de&quot; actors="ernie" template="jbpm.mail.templates.xml"> and I don't get an error. Martin btw, regarding your JIRA entry, not only the hibernate mapping for org.jbpm.graph.action.MailAction is missing, but also for org.jbpm.graph.node.MailNode View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4034924#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...