Yea, it seems it is trying to load HttpServletResponse from Gate. Here is the result of the invocation of displayClassInfo(): javax.servlet.http.HttpServletResponse Information Repository cache version: javax.servlet.http.HttpServletResponse(ad9f8a).ClassLoader=sun.misc.Launcher$AppClassLoader@a39137 ..sun.misc.Launcher$AppClassLoader@a39137 ....file:/C:/Program%20Files/JBoss-Portal/server/default/lib/gate.jar ....file:/C:/Program%20Files/Java/jdk1.5.0_09/lib/tools.jar ....file:/C:/Program%20Files/JBoss-Portal/bin/run.jar ..sun.misc.Launcher$ExtClassLoader@92e78c ....file:/C:/Program%20Files/Java/jdk1.5.0_09/jre/lib/ext/dnsns.jar ....file:/C:/Program%20Files/Java/jdk1.5.0_09/jre/lib/ext/localedata.jar ....file:/C:/Program%20Files/Java/jdk1.5.0_09/jre/lib/ext/sunjce_provider.jar ....file:/C:/Program%20Files/Java/jdk1.5.0_09/jre/lib/ext/sunpkcs11.jar ++++CodeSource: (file:/C:/Program%20Files/JBoss-Portal/server/default/lib/gate.jar ) Implemented Interfaces: ++interface javax.servlet.ServletResponse(c54b88) ++++ClassLoader: sun.misc.Launcher$AppClassLoader@a39137 ++++CodeSource: (file:/C:/Program%20Files/JBoss-Portal/server/default/lib/gate.jar ) ### Instance0 found in UCL: org.jboss.mx.loading.UnifiedClassLoader3@766a24{ url=null ,addedOrder=2} ### Instance1 via UCL: sun.misc.Launcher$AppClassLoader@a39137 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4055651#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...