Jenkins address already in use on Linux

Problem : Address already in use in Jenkins.

ava.io.IOException: Failed to start Jetty
        at winstone.Launcher.<init>(Launcher.java:156)
        at winstone.Launcher.main(Launcher.java:354)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at Main._main(Main.java:294)
        at Main.main(Main.java:132)
Caused by: java.net.BindException: Address already in use
        at sun.nio.ch.Net.bind0(Native Method)
        at sun.nio.ch.Net.bind(Net.java:437)
        at sun.nio.ch.Net.bind(Net.java:429)
        at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
        at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:298)
        at org.eclipse.jetty.server.AbstractNetworkConnector.doStart(AbstractNetworkConnector.java:80)
        at org.eclipse.jetty.server.ServerConnector.doStart(ServerConnector.java:236)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
        at org.eclipse.jetty.server.Server.doStart(Server.java:431)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
        at winstone.Launcher.<init>(Launcher.java:154)
        ... 7 more

Solution :

lsof -i tcp:8080

This should list pids for applications using port 8080. Once you have the pid you can kill the process with kill command

kill -9 <PID> #where <PID> is the process id returned by lsof

This will solve the problem.