Address reuse not working on new Java Runtime Environment

Question

I am using the following Code for Checking Address Resusability:-

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket         


        

Answer 1

The javadocs for setReuseAddress say:

When a TCP connection is closed the connection may remain in a timeout state for a period of time after the connection is closed (typically known as the TIME_WAIT state or 2MSL wait state). For applications using a well known socket address or port it may not be possible to bind a socket to the required SocketAddress if there is a connection in the timeout state involving the socket address or port.

Enabling SO_REUSEADDR prior to binding the socket using bind(SocketAddress) allows the socket to be bound even though a previous connection is in a timeout state.

But what you are doing does not match this use-case. You are not attempting to bind while some other socket is closing. You are actually trying to bind while another socket is open.

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What puzzles me is why your test actually worked on older JREs. It might be a JVM bug ...