Migration to Jenkins 2.1-AJP support removed in Winstone 3.0 due to Jetty 9 not supporting AJP

Question

I am moving from installing Jenkins 1.6.x to 2.x. The following error prevents Jenkins from starting

Jul 02, 2016 12:51:42 PM org.eclipse.jetty.util.log.JavaUtilLog warn WARNING: Empty contextPath Jul 02, 2016 12:51:42 PM winstone.Logger logInternal INFO: Winstone shutdown successfully Jul 02, 2016 12:51:42 PM winstone.Logger logInternal SEVERE: Container startup failed java.io.IOException: Failed to start a listener: winstone.Ajp13ConnectorFactory at winstone.Launcher.spawnListener(Launcher.java:207) at winstone.Launcher.<init>(Launcher.java:148) at winstone.Launcher.main(Launcher.java:352) 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:246) at Main.main(Main.java:91) Caused by: java.lang.UnsupportedOperationException: AJP support is removed in Winstone 3.0 due to Jetty 9 not supporting AJP. For reverse proxying, please use HTTP instead of AJP. at winstone.Ajp13ConnectorFactory.start(Ajp13ConnectorFactory.java:31) at winstone.Launcher.spawnListener(Launcher.java:205) ... 8 more Running from: /usr/lib/jenkins/jenkins.war 

How can I lift it?

Answer 1

This is in Jenkins 2.0 Overview :

Jenkins 2 no longer supports AJP with integrated Winstone-Jetty Container

The solution is to disable AJP. To quote a bugtracker :

Setting JENKINS_AJP_PORT="-1" in /etc/sysconfig/jenkins solved the problem