[Records] Component annotations not propagated when explicit canonical constructor is given

Gunnar Morling gunnar at hibernate.org
Sun Jan 19 21:14:48 UTC 2020


I'm observing the following behaviour around annotations on record
components, using JDK 14 b32. I'm putting an annotation to a record

    public record Person(@NotNull String name) {}

In this case the @NotNull annotation is propagated to the
corresponding parameter of the generated constructor, from where I can
obtain it using reflection. This is not the case though when I
explicitly declare the canonical constructor:

    public record Person(@NotNull String name) {
        public Person {
            // ...

In this case the annotation isn't propagated, and it won't be
retrievable from that constructor's parameter via reflection.

Is this behaviour intended or is it a bug actually? I lean towards the
latter, as I don't explicitly define the parameter in the constructor,
so I'd expect the annotations given on the component to still be

If it *is* intended, it'd make my use case a bit more complex, as I'd
want to be able to put other annotations to the canonical constructor
*itself*, while still getting all the component annotations propagated
to its parameters.

Thanks a lot,


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