RFR: 7903047: Make JUnit runner use the JUnit Platform Launcher [v12]

[Christian Stein]

On Mon, 25 Apr 2022 19:32:00 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> src/share/classes/com/sun/javatest/regtest/agent/JUnitRunner.java line 114:
>> 
>>> 112:     private static void runWithJUnitPlatform(Class<?> mainClass) throws Exception {
>>> 113:         // https://junit.org/junit5/docs/current/user-guide/#launcher-api-execution
>>> 114:         Thread.currentThread().setContextClassLoader(mainClass.getClassLoader());
>> 
>> this line, to set the context class loader, might be an issue for some core-libs tests.
>
> ... I guess it might just mean we can't use JUnit Jupiter for some of the low-level core-libs tests

Yes, either that or we find another way to make those core-libs tests and JUnit happy by agreeing upon a class loader.

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PR: https://git.openjdk.java.net/jtreg/pull/78