As reported by Eric Wong:In version 3.4.0/1, ServerSocket.accept() creates anew Socket() and then in the process invokeSocket.getImpl(), which goes something like this:-----SocketImpl getImpl() throws SocketException try { if (!implCreated) { impl.create(true); implCreated = true; } } catch (IOException e) { throw new SocketException(e.getMessage()); } return impl;-----But create(true) alone will causenatPlainSocketImplPosix.cc (depending on the platform)to create a fresh yet never-been-used socketdescriptor. As a result, lsof will show:>> socktest 31812 root 8u sock 0,0 1364355 can'tidentify protocolSo each ServerSocket.accept() call will generateadditional descriptor until we get EMFILE error ("Toomany open files").