Custom bean validation in a method

[Eng-Fouad]

Given:

public record FooRequest(int a, int b) implements ExtraValidation {
    public void validate() {
        if (a > b) throw new CustomException();
    }
}

@POST
@Path("/foo")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public void createFoo(@Valid FooRequest request) {
    // ...
}

How to make Quarkus invokes FooRequest.validate() automatically? In spring boot, I achieved this by implementing RequestBodyAdviceAdapter::afterBodyRead.

[Eng-Fouad]

I did it using ReaderInterceptor:

@Provider
public class ExtraValidationReaderInterceptor implements ReaderInterceptor {
    
    @Override
    public Object aroundReadFrom(ReaderInterceptorContext context) throws IOException {
        var object = context.proceed();
        if (object instanceof ExtraValidation e) {
            e.validate();
        }
        return object;
    }
}