RFR: 8356684: jpackage error messages are not helpful

[Alexey Semenyuk]

On Tue, 13 Jan 2026 16:42:43 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> If the output of an external command execution results in a fatal error, jpackage will print the command line of the external command. In quiet mode (without "--vrebose"), it will also print the command's output.
> 
> E.g. (unit test output):
> 
> jpackage --input MainTest\testFailedCommandOutput\input --dest MainTest\testFailedCommandOutput\output --name FailedCommandOutputMainTest --type app-image --main-jar hello.jar --main-class Hello --win-console
> Error: Unexpected exit code 17 from executing the command jlink-mock --output MainTest\testFailedCommandOutput\output\FailedCommandOutputMainTest\runtime --module-path runtime\jmods --add-modules java.base,jdk.xml.dom,jdk.zipfs --strip-native-commands --strip-debug --no-man-pages --no-header-files
> Command output:
> It
> fell
> apart

@sashamatveev PTAL

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PR Comment: https://git.openjdk.org/jdk/pull/29197#issuecomment-3747172601