Upgraded jenkins, it doesn't start anymore.

Even if i try to remove its directory, it recreates it cleanly but then crashes with following log.

I tried every version from 1.417 to 1.421. They do work. I tried various versions from 1.422 to 1.512, they all crash with the same symptoms.

[#|2013-04-24T07:24:49.849+0200|INFO|glassfish3.1.2|javax.enterprise.system.tools.admin.org.glassfish.deployment.admin|_ThreadID=106;_ThreadName=Thread-2;|jenkins was successfully deployed in 3,800 milliseconds.|#]

[#|2013-04-24T07:24:50.100+0200|INFO|glassfish3.1.2|jenkins.InitReactorRunner|_ThreadID=152;_ThreadName=Thread-2;|Listed all plugins|#]

[#|2013-04-24T07:24:50.100+0200|SEVERE|glassfish3.1.2|jenkins.InitReactorRunner|_ThreadID=152;_ThreadName=Thread-2;|Failed Loading plugins
java.lang.NullPointerException
at hudson.PluginManager$2$1.run(PluginManager.java:324)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:888)
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:722)

[#|2013-04-24T07:24:50.102+0200|SEVERE|glassfish3.1.2|hudson.WebAppMain|_ThreadID=143;_ThreadName=Thread-2;|Failed to initialize Jenkins
org.jvnet.hudson.reactor.ReactorException: java.lang.NullPointerException
at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:246)
at jenkins.InitReactorRunner.run(InitReactorRunner.java:43)
at jenkins.model.Jenkins.executeReactor(Jenkins.java:899)
at jenkins.model.Jenkins.<init>(Jenkins.java:801)
at hudson.model.Hudson.<init>(Hudson.java:81)
at hudson.model.Hudson.<init>(Hudson.java:77)
at hudson.WebAppMain$2.run(WebAppMain.java:214)
Caused by: java.lang.NullPointerException
at hudson.PluginManager$2$1.run(PluginManager.java:324)
at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:888)
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:722)

Jenkins is running on Glassfish 3.1.2.2 on a ubuntu 12.04 server.

Posted on http://stackoverflow.com/questions/16184035/cannot-run-jenkins-even-after-clearing-its-directory