Java: Check if Socket Connection Broken

Most common ways of check if a socket connection to server was broken is by send a heartbeat message to server. However, for application that connect to server that do not support heardbeat, we can check connection by listen to the InputStream:

('is' refer to java.io.InputStream)

int bytesRead = is.read(receiveBuffer, 0, 1024);
     
// this is the trick to identify connection drop
if(bytesRead == -1){
    throw new IOException("byteRead = -1, Connection closed.");
}