Java Generic Exception

Question

I am dealing with JaudioTagger API to manipulate MP3 files, I have to repeat the following exceptions over and over again... I was thinking of having a generic exception handler where I could forward each exception maybe with a flag number and the generic method would be deal with it by having different switch cases maybe ? Is it possible ? I would really appreciate if someone could give the method signature or a way to call it

} catch (CannotReadException ex) {
                Logger.getLogger(MainPanel.class.getName()).log(Level.SEVERE, null, ex);
            } catch (ReadOnlyFileException ex) {
                Logger.getLogger(MainPanel.class.getName()).log(Level.SEVERE, null, ex);
            } catch (IOException ex) {
                Logger.getLogger(MainPanel.class.getName()).log(Level.SEVERE, null, ex);
            } catch (InvalidAudioFrameException ex) {
                Logger.getLogger(MainPanel.class.getName()).log(Level.SEVERE, null, ex);
            } catch (TagException ex) {
                Logger.getLogger(MainPanel.class.getName()).log(Level.SEVERE, null, ex);
            }

What do you mean with "repeat exceptions"?

Behe
– Behe

2012-07-08 21:23:41 +00:00
Commented Jul 8, 2012 at 21:23 — Behe
– Behe, Commented Jul 8, 2012 at 21:23

John Watts · Accepted Answer · 2012-07-08 21:23:42Z

Pre-JDK 7 all you can do is write a utility function and call it from each of the catch blocks:

private void handle(Exception ex) {
    Logger.getLogger(MainPanel.class.getName()).log(Level.SEVERE, null, ex);
}

private void someOtherMethod() {
    try {
        // something that might throw
    } catch (CannotReadException ex) {
        handle(ex);
    } catch (ReadOnlyFileException ex) {
        handle(ex);
    } catch (IOException ex) {
        handle(ex);
    } catch (InvalidAudioFrameException ex) {
        handle(ex);
    } catch (TagException ex) {
        handle(ex);
    }
}

Starting in JDK 7, you can use multi-catch:

private void someOtherMethod() {
    try {
        // something that might throw
    } catch (CannotReadException | ReadOnlyFileException | IOException
             | InvalidAudioFrameException | TagException ex) {
        Logger.getLogger(MainPanel.class.getName()).log(Level.SEVERE, null, ex);
    }
}

See "Catching multiple exceptions".

Johannes Kuhn · Accepted Answer · 2018-02-11 18:02:12Z

0

This answer is obsolete starting with Java 7. Use multi-catch like John Watts shows in his answer.

I suggest using

try {
    /* ... your code here ... */
} catch (Exception ex) {
    handle(ex);
}

And handle it this way: (you have to replace the OtherException that you don't handle or remove the throws)

private static void handle(Exception ex) throws SomeOtherException {
    if (ex instanceof CannotReadException || ex instanceof ReadOnlyFileException) {
        Logger.getLogger(MainPanel.class.getName()).log(Level.SEVERE, null, ex);
    } else if (ex instanceof SomeOtherException) {
        throw (SomeOtherException) ex;
    } else if (ex instanceof RuntimeException) {
        throw (RuntimeException) ex;
    } else {
        throw new RuntimeException(ex);
    }
}

edited Feb 11, 2018 at 18:02

answered Jul 8, 2012 at 21:48

Johannes Kuhn

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