Currently, the @TransformedBy annotation is only supported at method level - i.e on the setter of a given type. However, it could be practical, and probably more useful, to specify it at class level.
The attached patch allows specifying @TransformedBy on class. It also even allows to specify a transformer on another annotation: if @MyAnnotation is itself annotated with @TransformedBy(SomeTransformer.class), then any class annotated with @MyAnnotation will be transformed with SomeTransformer. I had use-case for this with
MGNLUI-1826, but this isn't the case anymore.
I don't remember exactly what the first part of the patch was for - unrelated IIRC - was fixing some issue with "indexed properties" (which we normally don't use IIRC). It can probably be ignored for this specific feature - attached patch has no tests, please write some before applying.
Additionally, please add the @Documented annotation to @TransformedBy.