In the jbpm context (jbpm 3.1.2 from the starter kit on top of JBOSS 4.0.4 GA), here's what we did to fix things (from our internal wiki): The JBPM application included in the starters kit includes a version of ehcache, ehcache-1.1.jar, which is out of date and incompatible with the rest of the JBOSS environment. This link describes a fix to the problem, which is to replace ehcache-1.1.jar with ehcache-1.2.jar. I did this in the following manner: $ cd ${JBPM_SRC}/lib/hibernate $ cp ${DOWNLOADS}/ehcache-1.2.jar . $ svn rm ehcache-1.1.jar $ svn add ehcache-1.2.jar We also need to edit ${JBPM_SRC}/build.xml and change the reference to ehcache-1.1.jar to ehcache-1.2.jar, so that the new jar file is properly included in the jbpm.sar file that results. After this was done, I just rebuilt and re-installed the application. See below for the details. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3961938#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...