Documentation: update java sample wrapper for java 7

The sample wrapper currently fails on some Java 7 .class files.  This
updates the wrapper to properly handle those files.

Signed-off-by: Jonathan Callen <jcallen@gentoo.org>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>