This is an old bug that we couldn't crack in the past that happens only in the build environment. This doesn't indicate any problem with the build.
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Subject: [platform-releng-dev] 4.7.0 N-Build: N20160807-2000: 3 failures from ep47N-unit-cen64
Date: Mon, Aug 8, 2016 12:40 PM
 
4.7.0 N-Build: N20160807-2000: 3 failures from ep47N-unit-cen64
   Build logs and test results:
      http://download.eclipse.org/eclipse/downloads/drops4/N20160807-2000/testResults.php
   Tests Passed: 99988     Total Number of Tests: 99991     Total Tests Time: 4 h 33 m     Total Elapsed Time: Invalid argument: it must be all digits, but was null or empty
 
   In general, the tests can be viewed on Hudson at
      https://hudson.eclipse.org:443/shared/view/Eclipse and Equinox/
 
   For this specific test the specific Hudson job results can be viewed at
      https://hudson.eclipse.org:443/shared/view/Eclipse and Equinox/job/ep47N-unit-cen64/90/