Socket SO KEEPALIVE

External

• https://docs.oracle.com/javase/10/docs/api/java/net/SocketOptions.html#SO_KEEPALIVE

Internal

• Java Networking
• TCP Keep-Alive

Overview

Tells whether the TCP Keep-Alive mechanism is turned on for a socket. TCP Keep-Alive works as described here:

TCP Keep-Alive

The value of the configuration flag can be obtained from the Socket or from the SocketChannel with supportedOptions().

All we can do on a Java socket is to turn TCP KeepAlive on or off - apparently on a per-socket based:

void setKeepAlive(boolean);
boolean getKeepAlive();

The KeepAlive parameters can be only set at the operating system level.