Thread safety bug in Observable
-------------------------------

                 Key: HARMONY-6300
                 URL: https://issues.apache.org/jira/browse/HARMONY-6300
             Project: Harmony
          Issue Type: Bug
          Components: Classlib
    Affects Versions: 5.0M10
         Environment: N/A
            Reporter: Imran Ghory
            Priority: Minor


In the RI Observable.java setChanged() & hasChanged()  are synchronized to guarantee visibility of changed status across threads. 

This isn't the case in the Harmony Observable. 

This could be fixed by either setChanged()/hasChanged() being made synchronized or the changed variable volatile, otherwise one thread could change the observable without it being visible to other threads. 

Although the specification  for the Observable class  doesn't specifically say that changes to Change status will be visible across all threads, it seems to be implied in the statement  "subclasses may ... deliver notifications on separate threads".

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