Code review request: 7077389 Reflection classes do not build with javac -Xlint:all -Werror

[Alexandre Boulgakov]

Hello Joe,

Could you please review these small changes to remove javac build 
warnings from the reflection classes?

Bug detail: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7077389
webrev: http://cr.openjdk.java.net/~mduigou/7077389/0/webrev/ 
<http://cr.openjdk.java.net/%7Emduigou/7077389/0/webrev/>

I haven't updated the copyrights to avoid polluting the webrev.
I did not add JAVAC_WARNINGS_FATAL=true to the makefile because it is 
responsible for other packages which still have build warnings.

Thanks,
Sasha