Irregularly, when building any project, the hudson maven process ends with this
nice stacktrace, causing the build to fail

[HUDSON] Archiving
/home/jboss/.hudson/jobs/parallelRun-model/workspace/parallelRun-model/target/parallelRun-model-1.2-SNAPSHOT.jar
to
/home/jboss/.hudson/jobs/parallelRun-model/modules/be.rvponp$parallelRun-model/builds/2009-03-31_16-43-26/archive/be.rvponp/parallelRun-model/1.2-SNAPSHOT/parallelRun-model-1.2-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] null
[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.lang.NullPointerException
at
hudson.plugins.tasks.TasksMavenResult.hasPreviousResult(TasksMavenResult.java:86)
at hudson.plugins.tasks.util.BuildResult.loadNewWarnings(BuildResult.java:608)
at hudson.plugins.tasks.util.BuildResult.getNewWarnings(BuildResult.java:594)
at
hudson.plugins.tasks.util.AbstractResultAction.updateBuildHealth(AbstractResultAction.java:339)
at
hudson.plugins.tasks.MavenTasksResultAction.update(MavenTasksResultAction.java:148)
at hudson.maven.MavenModuleSetBuild.notifyModuleBuild(MavenModuleSetBuild.java:280)
at hudson.maven.MavenBuild$ProxyImpl2.end(MavenBuild.java:386)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
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)
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 22 seconds
[INFO] Finished at: Tue Mar 31 16:43:53 CEST 2009
[INFO] Final Memory: 27M/49M
[INFO] ------------------------------------------------------------------------
Waiting for Hudson to finish collecting data
channel stopped
Finished: FAILURE

This happens after the deploy step has been succesfully completed. The problem
is not really reproduceable, as consecutive builds of the same project will not
always lead to this NPE.

The problem started happening with hudson v295 (or 294), the following plugins
have been installed:

Hudson plugin for "Polarion Webclient for SVN" 1.1
Hudson Checkstyle Plug-in 2.7
Hudson build timeout plugin 1.4
Hudson Warnings Plug-in 2.5
Hudson Task Scanner Plug-in 3.5
Hudson Template Project plugin 1.0
Deploy to container Plugin 1.3
Hudson Dependency Analyzer Plugin 0.1
Hudson JIRA plugin 1.16
Green Balls 1.4 (disabled)
URL SCM plugin 1.4
Hudson FindBugs Plug-in 3.6
Hudson disk-usage plugin 0.8
Hudson Violations plugin 0.7.3
Sidebar Link 1.1
Hudson batch task plugin 1.6
Hudson SCP publisher plugin 1.5.2
Hudson Continuous Integration game 1.7
Locale plugin 1.0
Hudson PMD Plug-in 2.6
Unnamed - org.jvnet.hudson.plugins:ftppublisher:hpi:0.9
Hudson Duplicate Code Scanner Plug-in 1.6

Personally, I have a feeling something is going wrong with executing a
post-build action, but as the stacktrace seems generally-hudson-y, I'm not so sure.