There seems to be problems with JRuby libs which are too old. Under some circumstances you'll get

      Failed to load native POSIX impl; falling back on Java impl. Stacktrace follows.
      java.lang.NoClassDefFoundError: Could not initialize class com.sun.jna.Native
      at org.jruby.ext.posix.POSIXFactory.loadLibC(POSIXFactory.java:96)
      at org.jruby.ext.posix.POSIXFactory.loadLinuxPOSIX(POSIXFactory.java:65)
      at org.jruby.ext.posix.POSIXFactory.getPOSIX(POSIXFactory.java:24)
      at hudson.os.PosixAPI.<clinit>(PosixAPI.java:40)
      ...

      as stacktrace. As reported on http://jira.codehaus.org/browse/JRUBY-6712 this seems to be a problem of a too old JRuby version with outdated libs.

          [JENKINS-14351] Outdated JRuby libs

          Oli B. created issue -
          Oli B. made changes -
          Link New: This issue is related to JENKINS-13341 [ JENKINS-13341 ]
          Matthias Kraft made changes -
          Link New: This issue is blocking JENKINS-15682 [ JENKINS-15682 ]
          Matthias Kraft made changes -
          Priority Original: Major [ 3 ] New: Blocker [ 1 ]
          Jesse Glick made changes -
          Jesse Glick made changes -
          Link New: This issue is blocking JENKINS-13202 [ JENKINS-13202 ]
          Jesse Glick made changes -
          Assignee New: Jesse Glick [ jglick ]
          Jesse Glick made changes -
          Status Original: Open [ 1 ] New: In Progress [ 3 ]
          Jesse Glick made changes -
          Component/s New: core [ 15593 ]
          Component/s Original: other [ 15490 ]
          Component/s Original: maven [ 16033 ]
          URL Original: https://github.com/jenkinsci/jenkins/pull/770
          Labels New: jna native unix
          Jesse Glick made changes -
          Labels Original: jna native unix New: jna lts-candidate native unix
          SCM/JIRA link daemon made changes -
          Resolution New: Fixed [ 1 ]
          Status Original: In Progress [ 3 ] New: Resolved [ 5 ]

            jglick Jesse Glick
            javatux Oli B.
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              Created:
              Updated:
              Resolved: