[7u6] Request for approval for CR 7127235: (fs) NPE in Files.walkFileTree if cached attributes are GC'ed

[Seán Coffey]

I'd like to backport this recent fix from jdk8 to 7u.

bug report :
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7127235
JDK 8 changeset :

http://hg.openjdk.java.net/jdk8/tl/jdk/rev/400cc379adb5

regards,
Sean.