RFR: 8165276: Spec states to invoke the premain method in an agent class if it's public but implementation differs [v4]

[Mandy Chung]

On Wed, 16 Dec 2020 08:18:49 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> So PR1694 is really just about aligning the spec so that the premain method is public. However, it does not fix the overall accessibility issue.

OK I see that JDK-5070281 changes to allow the agent class to be non-public as the main class that declares `public static void main`.   So `setAccessible` should only be called if the agent class is in an unnamed module.  

If the agent class is in a named module and not accessible to java.instrument module (if the java agent is packaged in a modular JAR file), it should fail with IAE - can you confirm?    I wanted to understand the current behavior.

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PR: https://git.openjdk.java.net/jdk/pull/1694