NPE in RootResourceIterator --------------------------- Key: WFLY-73 URL: https://issues.jboss.org/browse/WFLY-73 Project: WildFly Issue Type: Bug Components: Domain Management, JMX Reporter: Brian Stansberry Assignee: Brian Stansberry Fix For: 8.0.0.Alpha1 Intermittent testsuite failures, e.g. http://lightning.mw.lab.eng.bos.redhat.com/jenkins/job/as7-param-pull/684... Log shows this repeatedly: [0m[33m18:38:11,612 WARN  [org.jboss.remotingjmx.protocol.v2.ServerCommon] (pool-2-thread-12) Unexpected internal error: java.lang.NullPointerException    at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:49)    at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:55)    at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:55)    at org.jboss.as.jmx.model.RootResourceIterator.iterate(RootResourceIterator.java:39)    at org.jboss.as.jmx.model.ModelControllerMBeanHelper.getMBeanCount(ModelControllerMBeanHelper.java:103)    at org.jboss.as.jmx.model.ModelControllerMBeanServerPlugin.getMBeanCount(ModelControllerMBeanServerPlugin.java:116)    at org.jboss.as.jmx.PluggableMBeanServerImpl.getMBeanCount(PluggableMBeanServerImpl.java:220)    at org.jboss.remotingjmx.protocol.v2.ServerProxy$GetMBeanCountHandler.handle(ServerProxy.java:618)    at org.jboss.remotingjmx.protocol.v2.ServerCommon$MessageReciever$1.run(ServerCommon.java:152)    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_13]    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_13]    at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_13] RootResourceIterator.doIterate is reading the resource twice: {code} for (ResourceEntry entry : current.getChildren(type)) {                        final PathElement pathElement = entry.getPathElement();                        final Resource child = current.getChild(pathElement); // why this call since "entry" and "child" should be the same object                        final PathAddress childAddress = address.append(pathElement);                        doIterate(child, childAddress);                    } {code} The problem is "child" is null, which is possible with a dynamic resource. So, either "entry" should be used, or, if there is some reason for the 2nd read, a check for null is needed before the recursive doIterate call.