RFR: 8266835: Add a --validate option to the jar tool [v2]

[Jorn Vernee]

On Tue, 8 Jun 2021 17:28:21 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update error message
>
> This all looks reasonable, I just wonder if the --validate description in the help output should provide a brief summary on what it does check. We can add to it as some validation is added. Without it then people will make assumptions on what it does.

@AlanBateman Thanks for the suggestion. I think adding a description is good idea. I initially left the description vague, so that the behavior could be more easily amended. But, on second thought, such changes would seemingly require no less review, so I think it's better to include a description, as suggested.

I've updated the description to say the following:


\      --validate             Validate a jar. This process will validate that the API\n\
\                             exported by a multi-release jar is consistent across all\n\
\                             different release versions.

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PR: https://git.openjdk.java.net/jdk/pull/3971