RFR: 8359053: Implement JEP 504 - Remove the Applet API

[Phil Race]

On Mon, 9 Jun 2025 18:11:13 GMT, Phil Race <prr at openjdk.org> wrote:

> This is the implementation of JEP 504 - Remove the Applet API.
> API changes are
> - Remove the entire java.applet package
> - Remove the javax/swing/JApplet class
> - Remove applet related APIs in java.beans
> - Update javadoc referring to applets, including one gif image - now changed to an svg image
> - 
> Other changes are
> - Remove references to the removed classes
> - Remove obsolete tests
> - Update obsolete code comments
> 
> sun.awt.AppContext is even more obsolete now than it was before, but eliminating uses of that will be is not required,
> and will be follow-on internal clean up, at a later date, under unrelated bug ids, and likely not completed in the same
> release as this JEP is integrated.
> 
> I have extensively tested this - running all the automated tests used by CI tiers 1 to 8.

test/jdk/ProblemList.txt line 782:

> 780: 
> 781: jdk/internal/loader/URLClassPath/ClassnameCharTest.java         8358729 generic-all
> 782: 

A fix for this test is being worked on - so this problem list addition may be withdrawn later if it is fixed before this PR is integrated.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25698#discussion_r2136231123