RFR: 8356438: Update OutputAnalyzer to optionally print process output as it happens [v2]

[David Holmes]

On Thu, 5 Jun 2025 09:36:37 GMT, Alice Pellegrini <duke at openjdk.org> wrote:

>> The implemented solution modifies the `OutputBuffer` implementation instead of the `OutputAnalyzer` implementation.
>> This is because the **OutputBuffer implementation which handles processes** (LazyOutputBuffer) starts a thread in its constructor, so we would need to add a strange additional constructor parameter to the `OutputBuffer.of(Process, Charset)` static method, while the printing through to stdout (and stderr) only makes sense for LazyOutputBuffer.
>> 
>> I believe changing the config option from `outputanalyzer.verbose` to `output buffer.verbose` would make it cleaner, and avoid referencing the OutputAnalyzer in the OutputBuffer implementation.
>
> Alice Pellegrini has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Merge remote-tracking branch 'origin/master' into 8356438-outputanalyzer-optional-print
>  - Update test/lib/jdk/test/lib/process/OutputBuffer.java
>    
>    Co-authored-by: Chen Liang <liach at openjdk.org>
>  - Initial working solution

I'm not sure I really understand the proposal here. To where is the output going "as it happens"? If you use OutputAnalyzer  correctly then on failure all output to stdout and stderr is printed via reportDiagnosticSummary. Could you give a concrete example of a test with a problem and how this change fixes it? Thanks.

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PR Comment: https://git.openjdk.org/jdk/pull/25587#issuecomment-2944254033