RFR: 8297794: Deprecate JMX Management Applets for Removal

[Daniel Fuchs]

On Wed, 30 Nov 2022 14:24:36 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

> MLetObjectInputStream and MLetParser are not public classes, so thinking they are not part of the public API we need to deprecate before removal.

Whether a class is public exported or not has no real relationship with whether it should have the `@Deprecated` annotation or not. It is better to add the `@Deprecated` annotation eagerly to all classes that are part of the feature being deprecated, if they are only used for the implementation of that feature, and if the thinking is that they would be removed if the feature is removed. Plus it usually simplifies things as it usually minimizes the places where you need to suppress warnings.

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PR: https://git.openjdk.org/jdk/pull/11430