Hello, I'm running JBoss AS 4.2.2.GA and have downloaded and built the drools- jbrms.war from the 4.0.6 source distribution under Mac OS X 10.5.2. When I deploy drools-jbrms.war, I get the following error: 11:52:10,028 WARN [config] Unable to process deployment descriptor for context 'JBoss Rules BRMS' 11:52:10,191 ERROR [[/drools-jbrms]] Exception sending context initialized event to listener instance of class org.jboss.web.jsf.integration.config.JBossJSFConfigureListener java.lang.LinkageError: Class javax/el/ELResolver violates loader constraints followed by the rest of the stack trace. If I download the pre-built drools-jbrms.war (also version 4.0.6) from the JBoss website it deploys and works just fine. I exploded the generated war file and discovered some extra jars not in the pre-built version. They are: jaxme-api-0.3.jar pull-parser-2.jar relaxngDatatype-20030807.jar stax-api-1.0.jar xpp3-1.1.3.4.O.jar xsdlib-20030807.jar Not sure why these are included, or how the pre-built version is actually built. My steps were: mvn clean ; mvn install Any suggestions?