One of my 400 Jenkins plugins is frequently throwing this error in my Jenkins log. But which plugin ???
rejecting javax.management.RuntimeErrorException according to standard blacklist; see https://jenkins.io/redirect/class-filter/ java.lang.SecurityException: Class rejected by the class filter: javax.management.RuntimeErrorException at jenkins.security.ClassFilterImpl.notifyRejected(ClassFilterImpl.java:335) at jenkins.security.ClassFilterImpl.isBlacklisted(ClassFilterImpl.java:323) at hudson.remoting.ClassFilter$1.isBlacklisted(ClassFilter.java:125) at hudson.remoting.ClassFilter.check(ClassFilter.java:64) at hudson.remoting.MultiClassLoaderSerializer$Input.resolveClass(MultiClassLoaderSerializer.java:130) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1819) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1713) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1986) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1535) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:422) at hudson.remoting.UserRequest.deserialize(UserRequest.java:291) at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:349) at hudson.remoting.Channel$2.adapt(Channel.java:992) at hudson.remoting.Channel$2.adapt(Channel.java:988) at hudson.remoting.FutureAdapter.get(FutureAdapter.java:59) at net.bull.javamelody.RemoteCallHelper.collectDataByNodeName(RemoteCallHelper.java:201) at net.bull.javamelody.RemoteCallHelper.collectJavaInformationsListByName(RemoteCallHelper.java:213) at net.bull.javamelody.NodesCollector.collectWithoutErrorsNow(NodesCollector.java:159) at net.bull.javamelody.NodesCollector.collectWithoutErrors(NodesCollector.java:147) at net.bull.javamelody.NodesCollector$1.run(NodesCollector.java:91) at java.util.TimerThread.mainLoop(Timer.java:555) at java.util.TimerThread.run(Timer.java:505)