HuiSheng Xu [http://community.jboss.org/people/rebody] replied to the discussion "why there have juel-*.jar? what do these package?" To view the discussion, visit: http://community.jboss.org/message/555331#555331 -------------------------------------------------------------- Hi Wu, The juel is used to resovle Expression in the jbpm-4.x.  Unfortunately,  these is confliction in tomcat-6.x.  Because both el-api.jar and juel-api.jar implemeneted the javax.el spec,  but they have different versions. The workaround is delete juel-api.jar from WEB-INF/lib directly. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/555331#555331] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]