On Wed, 2 Jun 2021 05:59:05 GMT, David Holmes <david.hol...@oracle.com> wrote:
> Sorry Jaroslav but I don't really see this test as a basic functional > test of the PreserveAllAnnotations flag. There is no need for any > dynamic retention mode switch. All you need as I've said previously is a > class with all the CLASS retention annotations of interest (8 IIRC) > applied and a programs that reads them, and either expects to find them > or not, based on the PreserveAllAnnotations flag. `CLASS` retention annotations are never returned by reflection regardless of whether the `PreserveAllAnnotations` option was used or not. The only way (apart from hacking into encapsulated state and doing your own parsing) is to compile a class that uses an annotation with `CLASS` retention and then run a test that looks up the annotation on this class after the annotation has been changed to have `RUNTIME` retention, but the class that uses it has not been recompiled. `AltClassLoader` does the trick which replaces the class file of _v1 class with the class file of _v2 class when loading the class which simulates this change and recompilation of the annotation without changing anything else. ------------- PR: https://git.openjdk.java.net/jdk/pull/4280
