cannot init cause of ClassCastException --------------------------------------- Key: JBREM-552 URL: https://issues.jboss.org/browse/JBREM-552 Project: JBoss Remoting Issue Type: Bug Security Level: Public(Everyone can see) Affects Versions: 2.0.0.Beta2 (Boon) Reporter: John Mazzitelli Assignee: Tom Elrod Priority: Minor Fix For: 2.0.0.CR1 (Boon) I'm in a catch clause within InvokerRegistry and I'm getting a weird exception thrown: java.lang.IllegalStateException: Can't overwrite cause at java.lang.Throwable.initCause(Throwable.java:320) at org.jboss.remoting.InvokerRegistry.loadClientInvoker(InvokerRegistry.java:447) at org.jboss.remoting.InvokerRegistry.createClientInvoker(InvokerRegistry.java:324) at org.jboss.remoting.Client.connect(Client.java:385) at org.jboss.on.communications.command.client.JBossRemotingRemoteCommunicator.getRemotingClient(JBossRemotingRemoteCommunicator.java:470) at org.jboss.on.communications.command.client.JBossRemotingRemoteCommunicator.send(JBossRemotingRemoteCommunicator.java:430) at org.jboss.on.communications.command.client.AbstractCommandClient.invoke(AbstractCommandClient.java:167) at org.jboss.on.communications.command.client.ClientCommandSender.send(ClientCommandSender.java:820) at org.jboss.on.communications.command.client.ServerPollingThread.run(ServerPollingThread.java:102) Look at line 447 and you'll see it is trying to init the cause of a ClassNotFoundException. Running in a debugger, the newly constructed exception created on 446 has a null cause. Looking then at Throwable.initCause and you'll see a null cause causes this IllegalStateException to be thrown. The cause needs to be "this", not null (I don't know why, seems like it should also look for null, but whatever - that's the way the JDK is written). The fix is simple - use the constructor that takes a throwable as its second parameter. Not sure why initCause it being used, as opposed to this constructor. e.g.: new ClassNotFoundException("Can not invoke loadClientInvokerClass method on " + transportFactoryClass, e); (notice the ", e" parameter). There are three other instances where initCause is called on ClassNotFoundException that also need to be fixed. See the other catch clauses in here.