Demian Calcaprina [https://community.jboss.org/people/calca] created the discussion "Re: Problem with jbpm 5.3, jboss 6.1 and BTMTransactionManagerLookup" To view the discussion, visit: https://community.jboss.org/message/816345#816345 -------------------------------------------------------------- As Juan said, If you are using Jboss, it would be better and simple to use Jboss TM. If you are having this error and using tomcat, make sure btm-2.1.1.jar and jta-*.jar aren't anywhere in your war files as Tomcat tries to load classes from the webapp before the tomcat and system classpaths. HTH Demian -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/816345#816345] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]