It seems that the fix for Issue #2760 not only did not provide any stdout/stderr
information, but removed the <errorStackTrace> information which was there
before. E.g.

http://deadlock.netbeans.org/hudson/job/NB-Core-Build/1978/testReport/

shows test failures incl. stderr. But

http://deadlock.netbeans.org/hudson/job/NB-Core-Build/1978/testReport/api/xml

shows nothing useful at all, beyond the fact that three tests failed somewhere
in org.openide.loaders.*.

Recent SVN revs which might be responsible: 14260, 14333, 14334, 14335