Groups > comp.lang.java.programmer > #30182

redesign exception

Newsgroups	comp.lang.java.programmer
Date	2014-10-25 19:16 -0700
Message-ID	<c79cbd2e-970b-4cd3-b181-da33bb43c4b6@googlegroups.com> (permalink)
Subject	redesign exception
From	boxzou@gmail.com

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I think Java exception need an overhaul. Here is why:

1. exception handling need very specific information (like primary key constraint violation). For human, a detailed message is required, for software a code is required.

2. this code information currently is implemented partly as exception type. But that is not enough, so some projects augment it with code like in SQLException (e.g. https://wiki.eclipse.org/EclipseLink_Exception_Error_Reference_(ELUG)).

3. As there are so many exception codes (refer to the EclipseLink above), they can't be implemented using exception types in a scalable manner. And they don't need to. Essentially we are treating Exception types (conceptually some strings too) as codes. So let's go back to just exception codes (strings).

4. If necessary, we can organize code into hierarchy: e.g. ReflectiveOperationException.NoSuchMethodFoundException. So you can either catch the more specific code NoSuchMethodFoundException or a broader code ReflectiveOperationException. This simulates catching super class exception.

5. With codes, it's much easier to define: for example, JreFaultCodes (https://github.com/pahakia/lib/blob/master/fault/src/main/java/pahakia/fault/JreFaultCodes.java) lists all about 850 Exceptions/Errors in JRE.

6. So I propose only one exception type: Fault. And one exception code type: FaultCode.

6. The new catch syntax would be: catch(someExceptionCode, Fault fault).

For more details, please read my blog: http://tri-katch.blogspot.ca

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redesign exception boxzou@gmail.com - 2014-10-25 19:16 -0700
  Re: redesign exception Joerg Meier <joergmmeier@arcor.de> - 2014-10-26 08:09 +0100
    Re: redesign exception rossum <rossum48@coldmail.com> - 2014-10-26 09:15 +0000
      Re: redesign exception Joerg Meier <joergmmeier@arcor.de> - 2014-10-26 10:36 +0100
      Re: redesign exception Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-10-26 09:23 -0400
        Re: redesign exception boxzou@gmail.com - 2014-10-26 12:56 -0700
          Re: redesign exception Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-10-26 18:10 -0400
            Re: redesign exception boxzou@gmail.com - 2014-10-26 17:39 -0700
      Re: redesign exception boxzou@gmail.com - 2014-10-26 12:06 -0700
        Re: redesign exception Joerg Meier <joergmmeier@arcor.de> - 2014-10-26 20:41 +0100
    Re: redesign exception boxzou@gmail.com - 2014-10-26 12:46 -0700
      Re: redesign exception boxzou@gmail.com - 2014-10-26 13:12 -0700
      Re: redesign exception Leif Roar Moldskred <leifm@huldreskog.localdomain> - 2014-10-26 16:50 -0500
        Re: redesign exception boxzou@gmail.com - 2014-10-26 17:21 -0700
      Re: redesign exception Martin Gregorie <martin@address-in-sig.invalid> - 2014-10-27 01:05 +0000
        Re: redesign exception boxzou@gmail.com - 2014-10-26 19:38 -0700
          Re: redesign exception Leif Roar Moldskred <leifm@huldreskog.localdomain> - 2014-10-27 00:13 -0500
            Re: redesign exception boxzou@gmail.com - 2014-10-27 04:59 -0700
            Re: redesign exception Marketa Jadalova <m-jadalova3@gmail.com> - 2014-10-27 16:55 +0000
              Re: redesign exception Leif Roar Moldskred <leifm@huldreskog.localdomain> - 2014-10-27 12:46 -0500
                Re: redesign exception boxzou@gmail.com - 2014-10-27 15:48 -0700
                Re: redesign exception Leif Roar Moldskred <leifm@huldreskog.localdomain> - 2014-10-27 22:16 -0500
                Re: redesign exception Robert Klemme <shortcutter@googlemail.com> - 2014-10-27 23:54 +0100
                Re: redesign exception boxzou@gmail.com - 2014-10-27 17:20 -0700
                Re: redesign exception boxzou@gmail.com - 2014-10-28 07:12 -0700
                Re: redesign exception Robert Klemme <shortcutter@googlemail.com> - 2014-10-29 08:34 +0100
                Re: redesign exception Martin Gregorie <martin@address-in-sig.invalid> - 2014-10-29 11:17 +0000
                Re: redesign exception Silvio <silvio@internet.com> - 2014-10-29 15:33 +0100
                Re: redesign exception Leif Roar Moldskred <leifm@huldreskog.localdomain> - 2014-10-29 11:35 -0500
                Re: redesign exception boxzou@gmail.com - 2014-10-29 17:51 -0700
                Re: redesign exception Leif Roar Moldskred <leifm@huldreskog.localdomain> - 2014-10-29 20:45 -0500
                Re: redesign exception boxzou@gmail.com - 2014-10-30 04:12 -0700
                Re: redesign exception Silvio <silvio@internet.com> - 2014-10-30 12:38 +0100
                Re: redesign exception boxzou@gmail.com - 2014-10-30 06:23 -0700
                Re: redesign exception boxzou@gmail.com - 2014-10-29 17:01 -0700
                Re: redesign exception Marketa Jadalova <m-jadalova3@gmail.com> - 2014-10-29 16:55 +0000
                Re: redesign exception Martin Gregorie <martin@address-in-sig.invalid> - 2014-10-29 17:29 +0000
                Re: redesign exception Robert Klemme <shortcutter@googlemail.com> - 2014-10-29 18:59 +0100
                Re: redesign exception Martin Gregorie <martin@address-in-sig.invalid> - 2014-10-29 22:05 +0000
                Re: redesign exception boxzou@gmail.com - 2014-10-29 18:04 -0700
                Re: redesign exception Leif Roar Moldskred <leifm@huldreskog.localdomain> - 2014-10-29 20:56 -0500
                Re: redesign exception boxzou@gmail.com - 2014-10-30 04:19 -0700
                Re: redesign exception boxzou@gmail.com - 2014-10-30 04:27 -0700
                Re: redesign exception boxzou@gmail.com - 2014-10-30 04:35 -0700
                Re: redesign exception boxzou@gmail.com - 2014-10-29 18:01 -0700
                Re: redesign exception boxzou@gmail.com - 2014-10-29 17:00 -0700
                Re: redesign exception boxzou@gmail.com - 2014-10-29 16:56 -0700
    Re: redesign exception boxzou@gmail.com - 2014-10-26 12:52 -0700
  Re: redesign exception Silvio <silvio@internet.com> - 2014-10-27 09:03 +0100
    Re: redesign exception boxzou@gmail.com - 2014-10-27 05:06 -0700
      Re: redesign exception Silvio <silvio@internet.com> - 2014-10-27 13:32 +0100
        Re: redesign exception boxzou@gmail.com - 2014-10-27 07:01 -0700

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