RFR: 8344560: Add system property for patched runtime

[Severin Gehwolf]

On Thu, 21 Nov 2024 05:24:26 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

> in addition, should we explicitly set this system property to false (or remove the system property) when --patch-module isn't used? I think that would then prevent applications from passing -Djdk.patched=true when the runtime hasn't been patched.

Sure, I can add this.

> While at it, should there be additional guards to prevent applications from changing the value of this system property by doing System.setProperty("jdk.patched") at runtime?

The JVM sets this property as read-only. So setting `jdk.patched=true` at command line or in code won't work to override. I'll add tests for these scenarios.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22277#discussion_r1851788164