With jdk7 b121 pit, *_Stub failed to compile due to

_HelloStub.java:68: cannot find symbol
     _set_delegate (delegate);
                    ^
  symbol: variable delegate
  location: class _HelloStub
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

Tests work fine with promoted jdk7 b119, but failed with jdk7 b121 pit
Please see error details and how to reproduce in comments