RFR: 8294972: Convert jdk.jlink internal plugins to use the Classfile API [v13]

[Mandy Chung]

On Mon, 20 Mar 2023 16:44:25 GMT, Mandy Chung <mchung at openjdk.org> wrote:

>> src/jdk.jlink/share/classes/jdk/tools/jlink/internal/plugins/SystemModulesPlugin.java line 581:
>> 
>>> 579:                         clb.withFlags(ACC_FINAL + ACC_SUPER)
>>> 580:                            .withInterfaceSymbols(List.of(CD_SYSTEM_MODULES))
>>> 581:                            .withVersion(52, 0);
>> 
>> @mlchung Do you recall why this was generated as version 52?
>
> When this plugin was added in JDK 9, no API to get the current class file version.  Later I added `jdk.internal.misc.VM::classFileVersion` and converted lambda proxies and lambda forms to use it.
> 
> I have a patch to switch class file version to `ClassFileFormatVersion::latest` in this generated class and some others but want to wait until this PR is integrated.

I posted https://github.com/openjdk/jdk/pull/13106 regarding the class file version.   

Having a second thought, no need to wait until this PR is integrated.  It should be easily merged.

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PR Review Comment: https://git.openjdk.org/jdk/pull/12944#discussion_r1142551119