Add support for GraalVM `lambdaCapturingTypes`

[ccwxl]

Affects: Spring Framework 6.0.2

---

• spring now support oracle/graal@b455f23 lambdaCapturingTypes?
• quarkus example: https://github.com/quarkusio/quarkus/pull/25861/files#diff-d14d5d0e8e07d50c36a60725e1848ff5a8a2e93b44888c140834e0a42552f88e
• Lambda writeReplace function error. quarkiverse/quarkus-mybatis#184

[bclozel]

I don't understand what's expected of us here. Spring Framework requires GraalVM 22.3 as a baseline, so I guess this feature is already present?

Do you have a sample Spring application that fails currently because of something missing here?
Do you want to register "lambdaCapturingTypes" metadata yourself and would like this to be introduced in RuntimeHints and more specifically SerializationHints?

Without more information and a concrete use case it's hard for us to decide what to do here.

[ccwxl]

yes. In Spring 6 I encountered the inability to register lambdaCapturingTypes programmatically

[bclozel]

After having a second look at the MyBatis issue I understand now. This is also something we were interested in for libraries that create lambdas as a way to make reflection faster.

Those cannot be detected during the AOT phase as they usually require running the code.

We can include this on the RuntimeHints API but I'm not sure we should surface it on an annotation as there is no place for this for now. Marking for team attention to discuss this. Thanks for creating this issue!

[ccwxl]

Thanks reply . At this stage, I use the following method to solve this problem

1. add native-image.properties

Args =--features=com.example.demo.RuntimeRegistrationFeature

2. on duringSetup stage register registerLambdaCapturingClass

public class RuntimeRegistrationFeature implements Feature {
    @Override
    public void duringSetup(DuringSetupAccess access) {
        System.out.println("duringSetup register MpController.");
        RuntimeSerialization.registerLambdaCapturingClass(MpController.class);
        RuntimeSerialization.register(SerializedLambda.class, SFunction.class);
    }
}