RFR: 8345622: test/langtools/tools/javac/annotations/parameter/ParameterAnnotations.java should set processorpath to work correctly in the agentvm mode

[Chen Liang]

On Wed, 11 Dec 2024 08:48:21 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

> There is a small difference in the `run main` action when the tests are run using the jtreg's `othervm` mode and `agentvm` mode: in the `othervm`, the test class(es) are load using the application `ClassLoader`, in the `agentvm` mode, the test class(es) are load using an additional jtreg's `ClassLoader`.
> 
> In most cases, this does not make much difference, but there's a difference when javac looks up annotation processors (or `Plugin`s): the `othervm` mode, javac can lookup the APs without any help, but in the `agentvm` mode, the `-processorpath` needs to be specified, so that the AP can be load from the correct place.
> 
> This patch undoes this (temporary) change:
> https://github.com/openjdk/jdk/commit/496641955041c5e48359e6256a4a61812653d900#diff-4a737e56ccac351e29c3b2c2313d854284ec489aa56c78f09d374d9e20bbb4ecR643
> 
> and sets the `-processorpath`, so that the AP can be load. This is consistent with how other similar javac's tests work.

Marked as reviewed by liach (Reviewer).

We might need to backport this to 24 too.

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PR Review: https://git.openjdk.org/jdk/pull/22676#pullrequestreview-2496496975
PR Comment: https://git.openjdk.org/jdk/pull/22676#issuecomment-2536797963