RFR: 7903981: Support easy way to use current class name for test actions [v4]

[Roger Riggs]

On Tue, 8 Apr 2025 17:39:43 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

>> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Base main entry-point name computation on file name
>
> src/share/doc/javatest/regtest/tag-spec.html line 1255:
> 
>> 1253: <td><code>test.main.class</code>
>> 1254: <td><i>Not Available</i>
>> 1255: <td>The computed name of the main entry-point of the current Java source file.
> 
> Might be add notes that 
> 1) packages are supported, based on package line
> 2) inner classes are not supported
> 3) the test fails during execution if ${test.main.class} is not found or doesn't have main() method. 
> It is just a suggestion, please update as you think it would be better. No need to overload users with info.

The error message produced when the executable can't be found should be very helpful.
Not specific to .java or the smart tag though.

On a similar typo, I got.
`TEST RESULT: Error. can't find FilePermissionTestX in test directory or libraries`
If it is a class name, it would be useful to say its a "class".

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PR Review Comment: https://git.openjdk.org/jtreg/pull/257#discussion_r2033848129