On 13/11/2024 03:44, David Holmes wrote:

The VM already sets properties like

 jdk.module.patch.N=<...>

when processing --patch-mods. Doesn't that suffice if all you need is a boolean flag to indicate any patching has occurred?

I would have thought you'd like to know which module has been patched, or to be able to ask if a given module has been patch - in which case an actual API method on java.lang.Module would seem reasonable. Or is this an area where module patching is only part of the implementation of Modules in the JDK, not part of the actual Java SE Module specification?

It's very JDK specific and --patch-module is complex due to being a repeated option. The jdk.module.patch.<N> properties are the internal way to communicate the values provide to --patch-module during startup. The properties are removed to avoid wider parts of the system having a dependency on its private protocol.

-Alan

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