RFR: 8359053: Implement JEP 504 - Remove the Applet API [v6]

[Phil Race]

On Thu, 12 Jun 2025 22:54:02 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> I would like to confirm that we treat ThreadGroup based sandboxing as equivalent to AppContext based sandboxing. There are a few places where we still use ThreadGroup instead of AppContext, and I believe we can drop that usage at the same time AppContext is removed, even if the specification includes statements like "Each {@code ThreadGroup} will receive its own instance." - correct?

I *think* that is true. The word/name AppContext probably should never be in API doc and saying  ThreadGroup is a decent substitute, but wherever we did either of these for the sake of applet partitioning they can probably all go away. I hope spec. appearances are rare.
Eliminating AppContext is going to be a good size piece by piece project even without that.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25698#discussion_r2145928751