Does anybody have suggestions for good resources and exercises on Java concurrency, particularly the new Java 5 constructs?
They should have model answers ideally. I also found the following a number of good examples in State Models and Concurrency (Magee):
One of the best book on subject is Java Concurrency in Practice.
Part I: Fundamentals
Thread Safety
Sharing Objects
Composing Objects
Building Blocks
Part II: Structuring Concurrent Applications
Task Execution (downloadable sample chapter)
Cancellation and Shutdown
Applying Thread Pools
GUI Applications
Part III: Liveness, Performance, and Testing
Avoiding Liveness Hazards
Performance and Scalability
Testing Concurrent Programs
Part IV: Advanced Topics
Explicit Locks
Building Custom Synchronizers
Atomic Variables and Nonblocking Synchronization
The Java Memory Model
I think its more than enough to get started with concurrency in Java.
JCiP has already been mentioned, but it doesn't have exercises. If you want something that will tear your head in two, see Herlihy's Art of Multiprocessor Programming, which uses Java, and dives deep into concurrency theory. It has exercises and companion code.
Not to mention that Prof. Herlihy is a stand-up guy, and brilliant besides.
JCiP is the right thing if you want practical guidance on use of the new concurrency utilities (you should also scan the archives of concurrency-interest). But if you want to go deeper, AoMP.