RFR: 8265173: [test] divert spurious log output away from stream under test in ProcessBuilder Basic test

[David Holmes]

On Wed, 14 Apr 2021 14:08:50 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> The most recent intermittent failure showed that the error occurred during VM initialization.
> Only the tty output was diverted, but not log output.
> Add diversion of log output as well tty output.
> 
> Add `-Xlog:all=warning:stderr` and `-Xlog:all=warning:stdout` to correspond to 
> `-XX:+DisplayVMOutputToStderr` and `-XX:+DisplayVMOutputToStdout`

Hi Roger,

The fix looks good, but it strikes me that any test using -XX:+DisplayVMOutputToXXX can potentially suffer from a similar problem e.g. (in this space):

test/jdk/java/lang/ProcessHandle/JavaChild.java

Thanks,
David

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3492