[jboss-user] Problem with multiple jar version and classloading

Hi, I wanna deploy a Wep App that makes use of commons-httpclient jar version 3.0.1. The problem is that an other version of commons-httpclient jar (version 2.0.2) is already present in JBossRoot/lib and in JBossRoot/server/default/lib. These two versions of the jar contains the same class (org.apache.commons.httpclient.HttpConnectionManager) but with different methods. So my web app throw the following exception : java.lang.NoSuchMethodError: org.apache.commons.httpclient.HttpConnectionManager.getParams() Is it possible to configure web app classloading to avoid this type of error ? Thanks Regards, Olivier