RFR: 8341090: Remove support for security manager from JavaFX

[Ambarish Rapte]

On Mon, 7 Oct 2024 20:03:49 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> This PR removes support for running JavaFX applications with the Java Security Manager.
> 
> The initial work was done in 4 separate commits as follows:
> 
> * Fail fast at startup if the Security Manager is enabled
> * Remove `-Djava.security.manager` and all security policy files; delete `SandboxAppTest`
> * Delete remaining tests that depend on the Security Manager; as part of this, I renamed`CustomSecurityManagerTest` to `StageRobotTest` and removed all of the tests that depend on the security manager, since the test methods that don't depend on SM are useful functional tests of a Stage's FullScreen and AlwaysOnTop mode.
> * API spec change to remove mention of security manager (including mention of throwing SecurityException)
> 
> This PR is both necessary and sufficient to remove support for running with the Java Security Manager enabled. I have tested this with JDK 23, which still has SM support (although deprecated for removal), and with a local JDK built from the [jdk-sandbox:jep486](https://github.com/openjdk/jdk-sandbox/tree/jep486) branch, which has the SM disabled. With both JDKs, I can build and run this PR branch; all tests pass. Attempting to enable the security manager with JDK 23 will now fail in `<clinit>` of either `LauncherImpl` (called by `Application.launch`) or `PlatformImpl` (called by `Platform.startup`) with an informative error message.
> 
> This PR should be integrated prior to the integration of JEP 486, so that we can continue to run JavaFX tests on JDK 24 after the SM is disabled. Otherwise they will fail to run with a fatal error launching the JVM (we currently pass `-Djava.security.manager=allow` when running our tests).
> 
> #### Follow-on work
> 
> I will file additional JBS issues to track follow-up work to cleanup the remaining calls to the security manager methods that are deprecated for removal. The follow-up work can be done independently of the timing of the integration of JEP 486 into JDK 24, but all of them will be targeted for JavaFX 24.
> 
> Follow-on issues for JavaFX 24:
> 
> * Remove all calls to `doPrivileged` (there are 350 such calls in 168 files)
> * Remove all other calls to `AccessController` (48 calls in 33 files)
> * Remove all remaining calls to `System::getSecurityManager` (45 calls in 27 files)
> * Remove calls to deprecated SM methods from `PlatformUtil` and `MethodUtil` in `javafx.base` (these are lightly modified copies of those classes in `java.base` so I will check how they are being handled)
> * Remove all uses (either throw or catch) o...

A full build/test run looks good. Javadoc has no mention of security manager anymore.

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Marked as reviewed by arapte (Reviewer).

PR Review: https://git.openjdk.org/jfx/pull/1595#pullrequestreview-2371859590