org.jvnet.hudson.reactor.ReactorException: java.lang.Error: java.lang.reflect.InvocationTargetException
	at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:246)
	at jenkins.InitReactorRunner.run(InitReactorRunner.java:43)
	at jenkins.model.Jenkins.executeReactor(Jenkins.java:815)
	at jenkins.model.Jenkins.<init>(Jenkins.java:736)
	at hudson.model.Hudson.<init>(Hudson.java:81)
	at hudson.model.Hudson.<init>(Hudson.java:77)
	at hudson.WebAppMain$2.run(WebAppMain.java:217)
Caused by: java.lang.Error: java.lang.reflect.InvocationTargetException
	at hudson.init.InitializerFinder.invoke(InitializerFinder.java:124)
	at hudson.init.InitializerFinder$TaskImpl.run(InitializerFinder.java:184)
	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
	at jenkins.model.Jenkins$5.runTask(Jenkins.java:804)
	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.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:636)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at hudson.init.InitializerFinder.invoke(InitializerFinder.java:120)
	... 8 more
Caused by: org.jboss.netty.channel.ChannelException: Failed to bind to: 0.0.0.0/0.0.0.0:8081
	at org.jboss.netty.bootstrap.ServerBootstrap.bind(ServerBootstrap.java:303)
	at org.webbitserver.netty.NettyWebServer.start(NettyWebServer.java:141)
	at org.webbitserver.netty.NettyWebServer.start(NettyWebServer.java:36)
	at org.codefirst.jenkins.wsnotifier.WsServer.reset(WsServer.java:40)
	at org.codefirst.jenkins.wsnotifier.WsServer.init(WsServer.java:23)
	... 13 more
Caused by: java.net.BindException: Address already in use
	at sun.nio.ch.Net.bind(Native Method)
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:137)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:77)
	at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.bind(NioServerSocketPipelineSink.java:148)
	at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.handleServerSocket(NioServerSocketPipelineSink.java:100)
	at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.eventSunk(NioServerSocketPipelineSink.java:74)
	at org.jboss.netty.channel.Channels.bind(Channels.java:468)
	at org.jboss.netty.channel.AbstractChannel.bind(AbstractChannel.java:200)
	at org.jboss.netty.bootstrap.ServerBootstrap$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