RFR 8160359: Improve jlink logging for cases when a plugin throws exception

[Mandy Chung]

Sundar,

Have you considered for plugins to throw different type of exceptions to differentiate if jlink should gracefully exit with no stack trace.  For example if it’s an user-error e.g. invalid option or duplicated entries then jlink can simply print the error message.

For unexpected error such as IOException, the stack trace would be useful for troubleshooting.

Mandy

On Nov 8, 2016, at 7:51 AM, Claes Redestad <claes.redestad at oracle.com> wrote:
> 
> Hi,
> 
> I think this looks good as-is, but:
> 
> Many times I've had the need to enable this kind of logging when
> building the JDK (as jlink plugins are now essential to creating the
> standard images), and having to hack the makefiles to add
> -J-Djlink.debug=true(?) to the right place seems a bit awkward.
> 
> Should we simply make this added verbosity the default in the build?
> 
> Thanks!
> 
> /Claes
> 
> On 2016-11-08 16:08, Sundararajan Athijegannathan wrote:
>> Please review for http://cr.openjdk.java.net/~sundar/8160359/webrev.00/
>> for https://bugs.openjdk.java.net/browse/JDK-8160359
>> 
>> Thanks,
>> 
>> -Sundar
>>