Cause: http://bugs.java.com/view_bug.do?bug_id=6543126 Consequence: The issue doesn't really have a workaround. The logmanager, or possibly in this case jboss-client.jar as it shades in the logmanager, needs to be loaded by the same class loader each time. Creating a new class loader to load the library each time will always result in a memory leak. Fix: No possible Result: JDK8+ should fix the problem