What solutions exist for a JVM-based queue that is larger than heap?

Question

I am looking at possible technology choices for queues (or perhaps streams are a better description) in a JVM-based system.

Some requirements:

• Must be ac

Answer 1

I ran across this FIFO queue with spill to disk which is kind of interesting and has some of the properties I'm looking for:

http://code.google.com/p/ashes-queue/