[jdk8u-dev] RFR: 8288483: JAVA_TOOL_OPTIONS are silently truncated if they exceed 1024 bytes [v2]

[Severin Gehwolf]

On Fri, 17 Jun 2022 13:08:58 GMT, Dmitry Samersoff <dsamersoff at openjdk.org> wrote:

>> The JAVA_TOOL_OPTIONS environment variable is used to pass additional JVM arguments.
>> 
>> The current implementation in jdk8 has an internal limit on the length of the option variable (1024 bytes) and the number of options (64).
>> 
>> A longer variable will be silently truncated and some options will be lost or the VM will exist with an unrecognized option error.
>> 
>> The fix is not a direct backport of the changes in the later JDKs, but I kept the code as close as possible to what we have in the latest jdk.
>> 
>> It's partial backport of relevant changes from JDK-8135195, JDK-8074895, JDK-8061999
>
> Dmitry Samersoff has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8288483: JAVA_TOOL_OPTIONS are silently truncated if they exceed 1024 bytes

This seems a high-risk backport. As far as I can see it's not explained why it's needed. Especially why now? 8u has been around for some time without that fix. We cannot just backport everything.

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PR: https://git.openjdk.org/jdk8u-dev/pull/74