Global Exception Handlers in Java

 

I am thinking of setting up a global, default Exception handler for my (Android) Mobile application(which uses Java syntax) using Thread.setDefaultUncaughtExceptionHandler(...) call. I am thinking of just displaying an Alert Dialog with appropriate message to the user.

Are there any gotchas, caveats and rules that one needs to follow when setting DefaultExceptionHandlers ? Any best practices like making sure that the process is killed, full stack trace is written to logs etc. ?

Links to documentation, tutorials etc. that can throw some light on this are welcome.

Thanks.

  • The name is a bit misleading, because using that method will set a default exception handler for all threads.
  • Make sure no exceptions can be thrown from your exception handler.
  • If you're doing GUI stuff from your exception handler, make sure you're doing it from the right thread.
  • An uncaught exception will only stop the thread where the exception took place, if that also causes the process to terminate depends on any other threads that might be running.

    • One possible problem with creating a global exception handler is you may get stuck in a loop of exceptions - some exceptions will be thrown repeatedly unless a program is terminated.

    If you mean that when an exception is thrown, a message is displayed then the app is terminated, then you'll be fine.

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