Hello. More information about my problem. This is a relative link about the memory leak with Drools and Tomcat : http://opensource.atlassian.com/confluence/spring/pages/viewpage.action?p... And we identified this problem on the following method : /** * Chargement des règles dans la rulebase. * * @param drlReader * @param dslReader */ Package readRules(URL drlUrl) { try { // use package builder to build up a rule package. PackageBuilder builder = new PackageBuilder(); URLConnection drlConn = drlUrl.openConnection(); Reader drlReader = new InputStreamReader(drlConn.getInputStream(), ENCODING); if (this.dsl == null) { builder.addPackageFromDrl(drlReader); } else { URLConnection dslConn = this.dsl.openConnection(); Reader dslReader = new InputStreamReader(dslConn.getInputStream()); builder.addPackageFromDrl(drlReader, dslReader); dslReader.close(); } drlReader.close(); // get the compiled package return builder.getPackage(); } catch (Exception e) { throw new RuleEngineException("Le package de règles est invalide !\r\n\r\nFichier : " + drlUrl, e); } } So, today, i'm looking for a solution to resolve this problem without stopping tomcat..... There is a solution with drools to release these allocations to the classloader in the WebApp ? And about drools programmers, please, have you any resolution to help me a little .... Thanks. Emmanuel GREFFET. (France) Emmanuel GREFFET (France) wrote: -- View this message in context: http://www.nabble.com/impossible-to-dispose-tomcat-devloader-when-i-reloa... Sent from the drools - user mailing list archive at Nabble.com.