Hi all, this is my first time posting here. First of all, I've read almost everything here: http://www.jboss.org/file-access/default/members/jbossas/freezone/docs/Se... I'm working with JBOSS 4.2.3 and my current mission is to deploy the same ear twice in the same jboss server instance. I had isolation problems (ClassCastException,...), so I decided to start with something very easy and write this TestCase: I have a ear containing a servlet. This servlet, when requested, prints the fully qualified name of a singleton and his memory address. So here is what I have (TestCase2.ear is a duplication of TestCase1.ear with a different context-root for requesting them seperatly): server | | | --- deploy | | | | | --- ear-deployer.xml (isolated parameter setted to true) | | | | | --- TestCase1.ear | | | | | | | --- TestCase1.war | | | | | | | --- WEB-INF | | | | | | | --- classes | | | | | | | | | --- myServlet.class | | | | | | | --- lib | | | | | | | --- mySingleton.jar | | --- TestCase2.ear | | | | | | | --- TestCase2.war | | | | | | | --- WEB-INF | | | | | | | --- classes | | | | | | | | | --- myServlet.class | | | | | | | --- lib | | | | | | | --- mySingleton.jar RESULT: The servlets print the same fully qualifiedName but different memory addresses. Until now everything is how I expected. ______________________________________________________ Then this is the second test: server | | | --- deploy | | | | | --- ear-deployer.xml (isolated parameter setted to true) | | | | | --- TestCase1.ear | | | | | | | --- TestCase1.war | | | | | | | --- WEB-INF | | | | | | | --- classes | | | | | | | --- myServlet.class | | | | | --- TestCase2.ear | | | | | | | --- TestCase2.war | | | | | | | --- WEB-INF | | | | | | | --- classes | | | | | | | --- myServlet.class | | | | --- lib | | | | | --- mySingleton.jar RESULT: The servlets print the same fully qualifiedName, the same classloader (UnifiedClassLoader3) AND the same memory addresses. This is very troublesome because this is not what I was waiting. I fully understand why they are loaded by the same UCL. For me, every jars in the lib directory of the server are shared libraries. But I don't understand why instances are shared between ears. Is this some kind of bug? Or is there another "shared lib directory" to do what I try to do? Regards, J. Guyard View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4201829#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...