RFR: 8305608: Change VMConnection to use "test.class.path"instead of "test.classes"

[Serguei Spitsyn]

On Tue, 4 Apr 2023 20:42:34 GMT, Leonid Mesnik <lmesnik at openjdk.org> wrote:

> Currently, VMConnection run debugee using "test.classes" as a classpath. It cause test failures when virtual thread factory (wrapper) is enabled and test is not located the same directory as TestScaffold.

test/jdk/com/sun/jdi/VMConnection.java line 54:

> 52:         // When we run under jtreg, test.classes contains the pathname of
> 53:         // the dir in which the .class files will be placed.
> 54:         // When we run jtreg with plugin, the TestScaffold should be also in classpath

A stupid question about this part of comment: `the TestScaffold should be also in classpath`.
If it should be ALSO in classpath then why in the `Virtual` case we use "test.class.path" instead of "test.classes" but not both. It'd be good to clarify this in the comment.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13339#discussion_r1157850857