When deploying webapp - by deploying jbpm-war - in order to launch the CommandThreadExecutor, got this error appearing : 11:23:38,491 INFO [STDOUT] command 'null' threw exception. rolling back transaction | 11:23:38,501 ERROR [CommandExecutorThread] java.lang.NullPointerException This error message appears every few seconds when the "executeCommand()" method is called. DB's table "MESSAGE" is empty. Besides this, CommandThreadExecutor is working properly. Thanks for your help. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4080413#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...