Fixing Java's ByteBuffer native memory "leak" (evanjones.ca)

[ 2015-December-27 14:42 ] TL;DR: The Java NIO API caches a maximum-sized direct ByteBuffer for each thread, which looks like a native memory leak if you read or write large blocks from many threads. You can easily patch the JDK yourself to work around this problem. Always use direct ByteBuffers with Java NIO APIs for the best performance, and to avoid this "leak." Under the covers, heap ByteBuffe

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“The Java NIO API caches a maximum-sized direct ByteBuffer for each thread, which looks like a native memory leak if you read or write large blocks from many threads. ”