But, I would like to state that there are better ways to cope with concurrency testing. junit framework is not good for that type of testing. You have to code on your own synchronization between threads and processes, just as you showed at this post. But this code is also error prone.
I suggest grinder framework (http://grinder.sourceforge.net/), that gives through its API out of the box concurrency and synchronization for java code.

Regards, Karlo.

Thanks for your comment. For the technical aspects of this article, you can discuss directly with the author on the book’s forum: http://www.manning-sandbox.com/forum.jspa?forumID=616

Shouldn’t you initialize

int threads = 10;

before

final CountDownLatch allThreadsComplete = #1
new CountDownLatch(threads); #1 ?