On Mon, 2 Mar 2026 14:08:02 GMT, David Beaumont <[email protected]> wrote:

>> Adds a new AnnotationProcessor to read the @MigratedValueClass on 
>> prospective value classes and generate the equivalent source file with the 
>> 'value' keyword at each annotated class declaration.
>> 
>> This adds new PROCESSOR_PATH variable to the compilation macro and use it 
>> for annotation processing.
>> This also requires moving the plugin discovery path to the new variable (was 
>> in classpath before) because the addition of a '--processor-path' flag 
>> disables using the classpath for plugin discovery.
>> 
>> For now this is all limited to `java.base` but that's expandable later 
>> easily. There was an issue just enabling it for all modules however (esp. 
>> `jdk.incubator` which might be special).
>> 
>> While there is currently no specific unit test for this code, if it were to 
>> fail to generate the correct value classes, a lot of other downstream tests 
>> would fail.
>
> David Beaumont has updated the pull request incrementally with two additional 
> commits since the last revision:
> 
>  - better error handling
>  - better error handling

The build issue I'm seeing is:
* `make clean jdk-image` : Everything works
* Then `make jdk-image` : Everything works
* Make text edit to `GenValueClasses.java` and `make jdk-image` : Build breaks

But I don't know enough about the JDK build setup to know if this is 
expected/normal (since it's non-hermetic in a lot of ways and having to `make 
clean` is fairly normal.

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PR Comment: https://git.openjdk.org/valhalla/pull/2180#issuecomment-3985092076

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