We have another service running on 8081 on a jenkins-master. Enabling the Websocket Plugin leads to a crash after restart with the stack trace [1].

The config does not contain any entries for the plugin yet, so no manual change of the port is possible (without guessing the correct xml).

Cheers,

Igor

[1] Stack trace on start:
org.jvnet.hudson.reactor.ReactorException: java.lang.Error: java.lang.reflect.InvocationTargetException
at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:246)
at hudson.model.Hudson.executeReactor(Hudson.java:753)
at hudson.model.Hudson.<init>(Hudson.java:667)
at hudson.model.Hudson.<init>(Hudson.java:607)
at hudson.WebAppMain$2.run(WebAppMain.java:215)
Caused by: java.lang.Error: java.lang.reflect.InvocationTargetException
at hudson.init.InitializerFinder.invoke(InitializerFinder.java:114)
at hudson.init.InitializerFinder$TaskImpl.run(InitializerFinder.java:174)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
at hudson.model.Hudson$4.runTask(Hudson.java:735)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at hudson.init.InitializerFinder.invoke(InitializerFinder.java:110)
... 8 more
Caused by: org.jboss.netty.channel.ChannelException: Failed to bind to: 0.0.0.0/0.0.0.0:8081
at org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:303)
at org.webbitserver.netty.NettyWebServer.start(NettyWebServer.java:141)
at org.webbitserver.netty.NettyWebServer.start(NettyWebServer.java:36)
at org.codefirst.jenkins.wsnotifier.WsServer.reset(WsServer.java:40)
at org.codefirst.jenkins.wsnotifier.WsServer.init(WsServer.java:23)
... 13 more
Caused by: java.net.BindException: Address already in use
at sun.nio.ch.Net.bind(Native Method)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:119)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:59)
at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.bind(NioServerSocketPipelineSink.java:148)
at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.handleServerSocket(NioServerSocketPipelineSink.java:100)
at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.eventSunk(NioServerSocketPipelineSink.java:74)
at org.jboss.netty.channel.Channels.bind(Channels.java:468)
at org.jboss.netty.channel.AbstractChannel.bind(AbstractChannel.java:200)
at org.jboss.netty.bootstrap.ServerBootstrap$Binder.channelOpen(ServerBootstrap.java:348)
at org.jboss.netty.channel.Channels.fireChannelOpen(Channels.java:176)
at org.jboss.netty.channel.socket.nio.NioServerSocketChannel.<init>(NioServerSocketChannel.java:85)
at org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory.newChannel(NioServerSocketChannelFactory.java:142)
at org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory.newChannel(NioServerSocketChannelFactory.java:90)
at org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:282)
... 17 more