The Sling class of the launcher should verify minimum JDK requirement and fail 
properly
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                 Key: SLING-190
                 URL: https://issues.apache.org/jira/browse/SLING-190
             Project: Sling
          Issue Type: Improvement
          Components: Launcher
            Reporter: Felix Meschberger
            Assignee: Felix Meschberger
             Fix For: 2.0.0


Currently, there is no check for the minimum Java Runtime environment required 
by Sling so, Sling will just fail with nasty exceptions if the requirement is 
not met. The Sling launcher (standalone app and web app) should be modified to 
fail gently in such cases:

   * The launcher is built agains JDK 1.4
   * The launcher checks for the required runtime version
   * If the runtime version is not correct, Sling should be terminated:
          -> standalone should just write the message to stderr and terminate 
the VM
          -> web app should log a message to the servlet container and throw a 
permanent UnavailableException

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