Olly Edgell [https://community.jboss.org/people/nofranksuk] commented on the document "Problem when deploying a jbpm web app into jboss" To view all comments on this document, visit: https://community.jboss.org/docs/DOC-48734#comment-12031 -------------------------------------------------- It looks like you have the jbpm 5 human task persistence unit defined in another application on your server. *org.jbpm.task*  is defined in a persistence.xml file. Check if you have it defined else where on the app server. --------------------------------------------------