When attempting to deploy version 5.1 of the drools execution server (drools-server.war) to JBoss AS 5.1.0.GA I receive the following ClassCastException: Caused by: java.lang.ClassCastException: org.apache.xerces.jaxp.DocumentBuilderFactoryImpl cannot be cast to javax.xml.parsers.DocumentBuilderFactory I tried removing the xml-apis-2.0.2.jar from the lib directory of the drools-server.war, but that resulted in xml parsing exceptions for the spring and camel configuration files. I tried adding a JBOSS-WEB.xml with the following class loader configuration: <class-loading java2ClassLoadingCompliance="false"> <loader-repository> xml-apis:archive=drools-server.war <loader-repository-config>java2ParentDelegation=false</loader-repository-config> </loader-repository> </class-loading> but that had no effect. The Drools Integration documentation says the following in regards to deploying the execution server: "Deploy on JBoss AS 4.x / Tomcat 6.x works out-of-the-box, instead some external dependencies must be added and the configuration must be changed to be deployed in JBoss AS 5" Does anyone know what these external dependencies and configuration changes are for JBoss AS 5? By the way, I have been able to successfully deploy and test the server on Tomcat 6.0.29. Thanks in advance for any help; I've been spinning my wheels on this one. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Can-t-Deploy-drools-s... Sent from the Drools - User mailing list archive at Nabble.com.