UIMA AS should add a global UncaughtExceptionHandler
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Key: UIMA-2358
URL: https://issues.apache.org/jira/browse/UIMA-2358
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Priority: Minor
Fix For: 2.4.0AS
Currently UIMA AS process doesnt handle uncaught exceptions. Specifically, it
should catch OOM Error and exit the process. When the OOM happens now, the jvm
dumps an error (stack trace) and the UIMA AS process just hangs. Since JDK 1.5,
java supports per thread as well a system wide (for all threads) custom
UncaughtExceptionHandler. The application implements this interface and injects
the handler to a specific thread via:
Thread.currentThread().setUncaughtExceptionHandler(new MyExceptionHandler());
Alternatively, one can set a global error handler via:
Thread.setDefaultUncaughtExceptionHandler(new MyExceptionHandler());
The latter is the approach that I will implement. When OOM Error happens (and
perhaps for all errors), the UIMA AS process should exit. For all other
exceptions (not caught in a executing thread), the custom exception handler
will simply log the exception at WARNING level.
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