On Mon, 30 Mar 2026 22:42:11 GMT, Bill Huang <[email protected]> wrote:

>> The idea is to implement the **ValueClass** annotation that can be used in 
>> test code to allow to run the same tests with and without --enable-preview.
>> 
>> This annotation should be used to mark value classes.
>> 
>> The new jtreg test compilation and execution mode that uses javac plugin to 
>> process classes during compilation. This plugin change classes with 
>> **ValueClass** annotation to value classes.
>> By default, the annotation doesn't have any impact on the tests.
>> 
>> Here are the work items:
>> 
>> 1. Create ValueClass annotation.
>> 2. Create a javac plugin, ValueClassPlugin, that implements a TaskListener 
>> to mark a class as a value class during the PARSE phase.
>> 3. Build the ValueClass plugin.
>> 4. Pass a new plugin option, -Xplugin:ValueClassPlugin, to enable the plugin 
>> and enable preview.
>
> Bill Huang has updated the pull request incrementally with one additional 
> commit since the last revision:
> 
>   Add back VALUE_CLASS_PLUGIN flag and enable it automatically when 
> --enable-preview is passed via jtreg options.

test/jdk/java/util/Collections/AddAll.java line 31:

> 29:  * @key randomness
> 30:  * @library /test/lib
> 31:  * @build jdk.test.lib.valueclass.AsValueClass

Is it needed? I thought that it should be built automatically.

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PR Review Comment: 
https://git.openjdk.org/valhalla/pull/2253#discussion_r3012612825

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