[Ant Wiki] Trivial Update of "AntWeaknessesAndProblems" by SteveLoughran

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The following page has been changed by SteveLoughran:
http://wiki.apache.org/ant/AntWeaknessesAndProblems

The comment on the change is:
->antcontrib for exceptions

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   * Persistent state. If the ant process dies, all explicit record of the state is lost. In a build, this is not a problem; file artifacts are still present, and rebuilds are the best action.
  
   * Fault handling. In a build process, task failure often means something is seriously wrong and needs fixing. In a workflow, exception handling logic allows for failures to be handled automatically.
+  Note that AntContrib has a <trycatch> task that provides some failure handling.
  
   * Parallel operation. Yes, there is a <parallel> task, but it gets complex to use. Also, you need to be sure that all the tasks that are used in parallel are safe to be used re-entrantly.
  

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