Before testing business processes, make sure that everything was deployed on your AS successfully, as it seems that there are problems related to your persistence configuration. Do a clean, install and start demo again, check the status of your deployment. It seems that you have badly configured JNDI name for your datasource. If you cannot deploy your jbpm without errors, you can send your server.log, standalone.xml and two persistence.xml files (from jbpm-gwt-console-server and jbpm-human-task).