Thanks for the report and the test case, Zhelyazko Chobantonov. We'll take a look asap.

That said, issue 1) looks a bit odd. You say your constraint is located in the default package (i.e. no package declaration), but at the same time you specify "java.lang" as the default package. The exception is expected then, as your constraint isn't located in that package "java.lang". So I'd say "works as designed" on this one.