I am currently reading about async programming and it seems to have a lot of advantages.
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But for web development should I make every request asnyc?
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Does async have disadvantages?
I am using Java with Play2 and async isn’t really to best looking thing.
http://www.playframework.org/documentation/2.0.2/JavaAsync
What is the basis for your conclusion that async is the best? It all depends upon the usecase. You need to think about error handling, communicating the results back to the user if you choose async processing.