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The Java NIO (new/non-blocking I/O) API introduced in Java 1.4 is arguably the most arcane part of the standard library. With channels, selectors, byte buffers and all the associated flipping, marking, compacting, event-handling and registering/de-registering of read/write interest, it’s a entirely different level of complexity to the old-fashioned, straightforward blocking I/O. And if you want to use SSL with NIO then it’s a whole new world of pain.