Hi Clebert, either I have expressed myself way too vaguely, or you answer was for another thread. What you are suggesting is exactly what I did. I saw the matrix and the duplicates. Then I clicked on loader references and saw there approx. 2000 references (I have removed the 200-reference limit in my copy of the references.jsp) My problem is, I am looking for the reference, which prevents the my ClassLoader from being collected by the GC. Do you have any suggestions on how to find this reference? As far as I understand, this reference will not be coming from the classes, which were loaded by that ClassLoader, but should come from classes loaded by parent classloaders. Is it possible to put a filter on references to show only references from classes, loaded by parent classloaders? If you have an ideea how to implement it in Java, I could implement it myself. I don't even have a clue, how to find out which classloader loaded a particular class. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3967510#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...