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You're most welcome.

> try writing anything in Node.js without a callback!

I wouldn't even try writing anything in Node. Server side javascript is not an option I would consider. http://www.youtube.com/watch?v=bzkRVzciAZg

Hazelcast on it's own is pretty useful if you need a distributed data grid in Java although it's not without its quirks. Unfortunately it's much less useful in Vertx because of the classloaders.

Callbacks as an antipattern is one of the main points of this HN post.