RFR: 7904141: JTReg should support running compact source files [v6]

[Jaikiran Pai]

On Mon, 16 Feb 2026 09:05:50 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> Please review this change that adds support for running [JEP 512: Compact Source Files and Instance Main Methods](https://openjdk.org/jeps/512) as jtreg `main` tests.
>> 
>> This pull request also adds JDK 25 to the GHA-based CI workflow and updates to use newer GitHub actions: `actions/checkout at v6` and `actions/setup-java at v5`
>
> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Environment variable already exported

src/share/classes/com/sun/javatest/regtest/agent/MainMethodHelper.java line 46:

> 44: 
> 45:     // Similar to sun.launcher.LauncherHelper#executeMainClass
> 46:     static void executeMainClass(Class<?> mainClass, String[] classArgs) throws

I think we should rename the second param to `mainMethodArgs`.

src/share/classes/com/sun/javatest/regtest/agent/MainMethodHelper.java line 117:

> 115:             System.err.println();
> 116:             AStatus.error("Can't create an instance of: " + e).exit();
> 117:             return null; // unreachable

Given that `createMainInstanceOrNull(...)` is a utility method that could be called from various places, I think we shouldn't `exit()` from here and instead should just propagate any exceptions and let the call site(s) decide what has to be done.

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PR Review Comment: https://git.openjdk.org/jtreg/pull/313#discussion_r2822875353
PR Review Comment: https://git.openjdk.org/jtreg/pull/313#discussion_r2822887598