RFR: JDK-8285764: Add system property for Java SE specification maintenance version [v2]

[Sean Mullan]

On Thu, 28 Apr 2022 17:36:32 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> Add a new system property, java.specification.maintenance.version, to return the maintenance release number of the Java SE specification being implemented. The property is unset, optional in the terminology of System.getProperties, for an initial release of a specification.
>> 
>> Please also review the CSR https://bugs.openjdk.java.net/browse/JDK-8285764
>> 
>> I'll update copyright years before an integration.
>
> Joe Darcy has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
> 
>  - Respond to review feedback.
>  - Respond to CSR feedback.
>  - Merge branch 'master' into JDK-8285497
>  - Update comment in template.
>  - JDK-8285497: Add system property for Java SE specification maintenance version

src/java.base/share/conf/security/java.policy line 34:

> 32:                    "java.specification.version", "read";
> 33:     permission java.util.PropertyPermission
> 34:                    "java.specification.maintenance.version", "read";

For consistency, you should probably also add a hard-coded permission to the `sun.security.provider.PolicyFile.initStaticPolicy()` method which is used as a fallback if there is a problem parsing the `java.policy` file. I doubt this will cause any issues as I don't suspect many/any applications will suddenly start reading this property and running with an SM but again it is mainly for consistency as all the other default permissions in this file are also granted in that method.

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PR: https://git.openjdk.java.net/jdk/pull/8437