I don't know why, but my Jenkins can not load the cobertura XML coverage reports which I create in multiple subdirectories of my build.

I use Cobertura v1.1 and Jenkins v1.396.

The error message about duplicate JARs don't help me, and I'm really lost now.

BUILD SUCCESSFUL
Total time: 9 minutes 6 seconds
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java.lang.reflect.InvocationTargetException
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 net.sourceforge.cobertura.util.FileLocker.lock(FileLocker.java:124)
at net.sourceforge.cobertura.coveragedata.ProjectData.saveGlobalProjectData(ProjectData.java:234)
at net.sourceforge.cobertura.coveragedata.SaveTimer.run(SaveTimer.java:31)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.nio.channels.OverlappingFileLockException
at sun.nio.ch.FileChannelImpl$SharedFileLockTable.checkList(FileChannelImpl.java:1176)
at sun.nio.ch.FileChannelImpl$SharedFileLockTable.add(FileChannelImpl.java:1078)
at sun.nio.ch.FileChannelImpl.lock(FileChannelImpl.java:834)
at java.nio.channels.FileChannel.lock(FileChannel.java:860)
... 8 more
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Unable to get lock on C:\hudson\data\jobs\myHermes.co.uk. 1.6 Compile\workspace\hudson_myhermes\pn_development\projects\C2C_PortletIntegration\cobertura.ser.lock: null
This is known to happen on Linux kernel 2.6.20.
Make sure cobertura.jar is in the root classpath of the jvm
process running the instrumented code. If the instrumented code
is running in a web server, this means cobertura.jar should be in
the web server's lib directory.
Don't put multiple copies of cobertura.jar in different WEB-INF/lib directories.
Only one classloader should load cobertura. It should be the root classloader.