RFR: 8274397: [macOS] Stop setting env. var JAVA_MAIN_CLASS_<pid> in launcher code [v2]

Phil Race prr at openjdk.java.net
Wed Sep 29 03:41:40 UTC 2021

On Mon, 27 Sep 2021 23:50:38 GMT, Phil Race <prr at openjdk.org> wrote:

>> macOS launcher code sets JAVA_MAIN_CLASS_<pid> which is read by AWT to set the name of the application in the system menu bar.
>> Because this set shortly after the VM is running, it causes a thread safety issue described in https://bugs.openjdk.java.net/browse/JDK-8270549
>> Since the AWT already looks for the system property "apple.awt.application.name" for this same purpose,
>> we can set that instead of the env. var and avoid the threading issue.
>> This trades the JAVA_MAIN_CLASS_<pid> pollution of the environment for setting a system property which is visible to apps as well but it seems a reasonable trade-off since we already (implicitly) support this variable anyway in preference to the env. var.
> Phil Race has updated the pull request incrementally with one additional commit since the last revision:
>   8274397: [macOS] Stop setting env. var JAVA_MAIN_CLASS_<pid> in launcher code

I've added code in the launcher part that strips the package name from what is seen.
This was previously done in the AWT code for MAIN_CLASS_<pid> since it was presumably the only code setting that but I didn't do it because before because I didn't want to interfere with what an app might have set as the system property .. but .. if the app didn't set it and we derived it, then I realised we probably should be consistent with what happened before and only the launcher code knows whether it was set by itself or the app


PR: https://git.openjdk.java.net/jdk/pull/5724

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