I am not sure what exactly happened as I am not the one who played with hudson's
config.

I think someone tried to enable the cobertura plugin on a project, then removed
it. Then the project stopped building with the following exception.

[INFO] Trace
java.lang.NullPointerException
at
hudson.plugins.cobertura.CoberturaProjectAction.<init>(CoberturaProjectAction.java:27)
at
hudson.plugins.cobertura.MavenCoberturaPublisher.getProjectAction(MavenCoberturaPublisher.java:198)
at hudson.maven.MavenModule.addTransientActionsFromBuild(MavenModule.java:396)
at hudson.maven.MavenModule.addTransientActionsFromBuild(MavenModule.java:68)
at
hudson.maven.AbstractMavenProject.updateTransientActions(AbstractMavenProject.java:57)
at hudson.maven.MavenModuleSet.updateTransientActions(MavenModuleSet.java:179)
at hudson.maven.MavenModuleSetBuild.notifyModuleBuild(MavenModuleSetBuild.java:288)
at hudson.maven.MavenBuild$ProxyImpl2.end(MavenBuild.java:386)
at sun.reflect.GeneratedMethodAccessor554.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
hudson.remoting.RemoteInvocationHandler$RPCRequest.perform(RemoteInvocationHandler.java:263)
at
hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:246)
at
hudson.remoting.RemoteInvocationHandler$RPCRequest.call(RemoteInvocationHandler.java:206)
at hudson.remoting.UserRequest.perform(UserRequest.java:92)
at hudson.remoting.UserRequest.perform(UserRequest.java:46)
at hudson.remoting.Request$2.run(Request.java:236)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

Looking at the configure page, cobertura wasn't enabled, so I restarted hudson.
Now the project is missing and in the hudson console log, I can find:

WARNING: Failed to load /home/hudson/.hudson/jobs/ABD-trunk
java.lang.NullPointerException
at
hudson.plugins.cobertura.CoberturaProjectAction.<init>(CoberturaProjectAction.java:27)
at
hudson.plugins.cobertura.MavenCoberturaPublisher.getProjectAction(MavenCoberturaPublisher.java:198)
at
hudson.maven.MavenModule.addTransientActionsFromBuild(MavenModule.java:396)
at
hudson.maven.MavenModule.addTransientActionsFromBuild(MavenModule.java:68)
at
hudson.maven.AbstractMavenProject.updateTransientActions(AbstractMavenProject.java:57)
at hudson.model.AbstractProject.onLoad(AbstractProject.java:199)
at hudson.maven.MavenModule.onLoad(MavenModule.java:180)
at hudson.model.Items.load(Items.java:110)
at hudson.model.ItemGroupMixIn.loadChildren(ItemGroupMixIn.java:58)
at hudson.maven.MavenModuleSet.onLoad(MavenModuleSet.java:356)
at hudson.model.Items.load(Items.java:110)
at hudson.model.Hudson.load(Hudson.java:1866)
at hudson.model.Hudson.<init>(Hudson.java:519)
at hudson.WebAppMain$2.run(WebAppMain.java:190)

What's funny is that /home/hudson/.hudson/jobs/ABD-trunk/config.xml doesn't
contain any reference to the cobertura plugin. Here is the publishers section:

<publishers>
<hudson.maven.RedeployPublisher>
<id>snapshots</id>
<url>http://deesse.bbc.no:8081/nexus/content/repositories/snapshots</url>
<uniqueVersion>false</uniqueVersion>
</hudson.maven.RedeployPublisher>
<hudson.tasks.BuildTrigger>
<childProjects>ABD-trunk-it</childProjects>
<threshold>
<name>SUCCESS</name>
<ordinal>0</ordinal>
<color>BLUE</color>
</threshold>
</hudson.tasks.BuildTrigger>
</publishers>

Another project does but this one loads properly.

Filling issue with core as I feel the problem is more of hudson somewhat
incorrectly dispatching the configs or maybe the project parameter, or something
like that.

Using hudson 1.291