RFR: 8268349: Provide more detail in JEP 411 warning messages

[David Holmes]

On Mon, 7 Jun 2021 20:42:53 GMT, Weijun Wang <weijun at openjdk.org> wrote:

> More loudly and precise warning messages when a security manager is either enabled at startup or installed at runtime.

There are a number of hotspot tests that will trigger this warning, so please ensure they work correctly with the extra output.

You might want to make your "WARNING" consistent with the VM's "Warning" so that OutputAnalyzer's logic to ignore warnings will automatically ignore these too.

Thanks,
David

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PR: https://git.openjdk.java.net/jdk/pull/4400