Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #34634

Re: Could not find or load main class com.mindprod.ensure.Ensure

Show all headers | View raw

On 6/14/2016 12:00 PM, Eric Douglas wrote:
> On Tuesday, June 14, 2016 at 11:31:31 AM UTC-4, Eric Sosman wrote:
> [...]
>>      But back to the original question: After you've logged or reported
>> or dissected or whatevered the error condition, what next?  Swallow the
>> exception and System.exit(), or re-throw the exception from main()?  For
>> myself, I'd find System.exit() noticeably *worse* than throwing, since
>> it makes your main() harder to call from places other than JVM startup.
>
> Normally we don't crash at the top level, so our application normally allows us to fix a problem and let the user continue.  I expect you should call System.exit() for anything severe enough to throw up to the top level.  At least this is how you're supposed to get the return code if your main class is called from a command prompt.  Otherwise I'm not sure what the difference is between an exit() and throwing an exception from the main().

     If main() is called from something other than the Java launcher (as
an ordinary method call from another class), that caller could catch a
thrown Exception and maybe do something about it.  But it will have a
harder time if your main() calls System.exit() instead.

     Okay, that could well be called a corner case.  Nonetheless: Before
calling System.exit() you will presumably print the Exception to record
its stack trace for posterity.  What's the difference between "print
stack trace and exit" and "let Java print stack trace and exit?"  How
is the first an improvement?

     I've seen several "We don't do it that way" responses, but haven't
yet seen an argument in support of "Throwing an exception from 'main'
is an antipattern."  *Why* is it an antipattern?  What's the drawback?

-- 
esosman@comcast-dot-net.invalid
"Don't be afraid of work. Make work afraid of you." -- TLM

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Could not find or load main class com.mindprod.ensure.Ensure Roedy Green <inquiry@mindprod.com> - 2016-06-13 06:51 -0700
  Re: Could not find or load main class com.mindprod.ensure.Ensure Roedy Green <inquiry@mindprod.com> - 2016-06-13 07:02 -0700
    Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Douglas <e.d.programmer@gmail.com> - 2016-06-13 07:15 -0700
  Re: Could not find or load main class com.mindprod.ensure.Ensure Roedy Green <inquiry@mindprod.com> - 2016-06-13 07:35 -0700
    Re: Could not find or load main class com.mindprod.ensure.Ensure Lew <lewbloch@gmail.com> - 2016-06-13 13:48 -0700
      Re: Could not find or load main class com.mindprod.ensure.Ensure Roedy Green <inquiry@mindprod.com> - 2016-06-13 14:11 -0700
      Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-06-13 20:54 -0400
        Re: Could not find or load main class com.mindprod.ensure.Ensure Arne Vajhøj <arne@vajhoej.dk> - 2016-06-13 21:57 -0400
          Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-06-13 22:58 -0400
            Re: Could not find or load main class com.mindprod.ensure.Ensure Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-14 10:33 +0000
              Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Douglas <e.d.programmer@gmail.com> - 2016-06-14 04:59 -0700
                Re: Could not find or load main class com.mindprod.ensure.Ensure Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-14 15:11 +0000
                Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-06-14 11:31 -0400
                Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Douglas <e.d.programmer@gmail.com> - 2016-06-14 09:00 -0700
                Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-06-14 13:18 -0400
                Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Douglas <e.d.programmer@gmail.com> - 2016-06-14 10:38 -0700
                Re: Could not find or load main class com.mindprod.ensure.Ensure Lew <lewbloch@gmail.com> - 2016-06-14 12:55 -0700
                Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Douglas <e.d.programmer@gmail.com> - 2016-06-14 13:14 -0700
                Re: Could not find or load main class com.mindprod.ensure.Ensure Lew <lewbloch@gmail.com> - 2016-06-14 13:34 -0700
                Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Douglas <e.d.programmer@gmail.com> - 2016-06-14 13:58 -0700
          Re: Could not find or load main class com.mindprod.ensure.Ensure Lew <lewbloch@gmail.com> - 2016-06-14 12:52 -0700
            Re: Could not find or load main class com.mindprod.ensure.Ensure Stanimir Stamenkov <s7an10@netscape.net> - 2016-06-15 02:46 +0300
              Re: Could not find or load main class com.mindprod.ensure.Ensure Lew <lewbloch@gmail.com> - 2016-06-15 12:22 -0700
              Re: Could not find or load main class com.mindprod.ensure.Ensure Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-16 01:17 +0000
                Re: Could not find or load main class com.mindprod.ensure.Ensure Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-06-15 21:56 -0400
                Re: Could not find or load main class com.mindprod.ensure.Ensure Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-16 11:01 +0000

csiph-web