"The read( ) method normally waits as long as it needs to in order to get a byte of data. Most input streams do not time out." via Check out this quote from Java I/O, 2nd Edition - https://www.safaribooksonline.com/library/view/java-io-2nd…

MongoDB Java Driverの実装で理解できないところがあるので ByteBufferの勉強をしている