One of the features in GridGain's In-Memory Data Platform that often goes unspoken for is ability to launch multiple GridGain's node in the single JVM.
Now, as trivial as it sounds... can you start multiple JBoss or WebLogic or Infinisnap or Gigaspaces or
Not so with GridGain. As I mentioned - you can launch as many GridGain nodes as you need in the single JVM. As the matter of fact - this is exactly how we debug complex internal algorithms here at GridGain System when we develop our product. We launch entire micro cloud of 5-10 nodes in the single JVM (right from our JUnits), put breakpoints into different nodes and walk in debugger through complex distributed execution path... never leaving the convenience of your local IDE's debugger.
Naturally, all functionality (your tasks, access to data grid, clustering, messaging, CEP, etc.) work exactly the same way in a single JVM as it would on separate physical computers. You don't have to adjust or reconfigure anything!
Now that's the a productivity feature that most of us can appreciate.