In our build system we use what we called virtual packages which create
symlinks that point out of the build tree.

In the exception message fragment:

Caused by: IO error scanning directory '/work/hudson/workspace/Central_Processor/trunk/3rdParty/openmpi/trunk/install/lib/ssl/private'

The path:
/work/hudson/workspace/Central_Processor/trunk/3rdParty/openmpi/trunk/install
is a symlink to /usr.

Our CppUnit Pattern '*/tests/-results.xml' means that it tries to explore
the entire /usr hierarchy and comes across directories that it cannot access.

Ok in our case we can avoid this by restricting our CppUnit Pattern to only
one part of the tree which (by definition) cannot contain virtual packages
and is only place where unit tests are found.

However I do not think an exception is the correct thing to do.
It would be better to just log inaccessible directories and continue.
Yes ours is unusual case but it is conceivable that a build system could
create inaccessible directories even within the checked out tree.

Also Hudson reported everything ok and it was only by examining the console
log that this problem was discovered.

The last part of the console message is given below.
==========================================================================
Result Summary:
============================
simple PASS
[xUnit] Starting to record.
[xUnit] [CppUnit] - Use the embedded style sheet.
ERROR: Publisher com.thalesgroup.hudson.plugins.xunit.XUnitPublisher aborted due to exception
hudson.util.IOException2: The plugin hasn't been performed correctly.
at com.thalesgroup.hudson.plugins.xunit.XUnitPublisher.perform(XUnitPublisher.java:126)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:582)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:563)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:550)
at hudson.model.Build$RunnerImpl.post2(Build.java:152)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:528)
at hudson.model.Run.run(Run.java:1233)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:122)
Caused by: hudson.util.IOException2: remote file operation failed: /work/hudson/workspace/Central_Processor at hudson.remoting.Channel@4d885088:mymachine
at hudson.FilePath.act(FilePath.java:690)
at hudson.FilePath.act(FilePath.java:676)
at com.thalesgroup.hudson.plugins.xunit.XUnitPublisher.perform(XUnitPublisher.java:99)
... 10 more
Caused by: hudson.util.IOException2: Problem on converting into JUnit reports.
at com.thalesgroup.hudson.plugins.xunit.transformer.XUnitTransformer.invoke(XUnitTransformer.java:154)
at com.thalesgroup.hudson.plugins.xunit.transformer.XUnitTransformer.invoke(XUnitTransformer.java:57)
at hudson.FilePath$FileCallableWrapper.call(FilePath.java:1962)
at hudson.remoting.UserRequest.perform(UserRequest.java:114)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:270)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
at java.util.concurrent.FutureTask.run(FutureTask.java:123)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)
Caused by: IO error scanning directory '/work/hudson/workspace/Central_Processor/trunk/3rdParty/openmpi/trunk/install/lib/ssl/private'
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1065)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1100)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1100)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1100)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1100)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1100)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1100)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1100)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1100)
at org.apache.tools.ant.DirectoryScanner.checkIncludePatterns(DirectoryScanner.java:856)
at org.apache.tools.ant.DirectoryScanner.scan(DirectoryScanner.java:817)
at org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:435)
at org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:400)
at com.thalesgroup.hudson.plugins.xunit.transformer.XUnitTransformer.findtReports(XUnitTransformer.java:189)
at com.thalesgroup.hudson.plugins.xunit.transformer.XUnitTransformer.processTool(XUnitTransformer.java:272)
at com.thalesgroup.hudson.plugins.xunit.transformer.XUnitTransformer.invoke(XUnitTransformer.java:134)
... 11 more
Finished: SUCCESS