Java 7 doesn't throw BindException when binding an already used port using ServerSocket - sockets

Question

I'm experimenting on ServerSocket in Java on Windows 7 x64.
I wrote a little program that host a HTTP server on port 8080 and only returns a static HTML response that contains the toString() of the class loader.
What I did in the program mainly:
Create a ServerSocket
call setReuseAddress(false) on the serverSocket
Bind port 8080 to this socket
Use a forever loop to accept socket and give response
First I tried with JRE 1.6.0_23 and everything is great: first instance launched and responds normally, second instance cannot be launched since exception is thrown:
Exception in thread "main" java.net.BindException: Address already in use: JVM_Bind
Unexpected thing happens when I tried with JRE 1.7.0_5: both instance can be launched successfully but only the first instance gives responses. After the first instance is kill, the second instance then starts to responds.
Am I doing anything wrong or is this a bug of JRE 7?
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
public class TestServerSocket {
private static final String HEADER = "HTTP/1.1 200 OK\r\n" + "Content-type: text/html\r\n"
+ "Connection: close\r\n" + "\r\n";
private static final int PORT = 8080;
private static void handle(Socket socket) {
System.out.println(socket.getInetAddress() + ":" + socket.getPort());
StringBuilder buffer = new StringBuilder();
buffer.append(HEADER);
buffer.append(TestServerSocket.class.getClassLoader());
try {
socket.getOutputStream().write(buffer.toString().getBytes());
} catch (IOException e) {
} finally {
try {
socket.close();
} catch (IOException e) {
}
}
}
public static void main(String[] args) throws IOException {
int port;
try {
port = Integer.parseInt(args[0]);
} catch (Exception e) {
port = PORT;
}
final ServerSocket server = new ServerSocket();
server.setReuseAddress(false);
server.bind(new InetSocketAddress(port));
// Terminator thread, stop when Ctrl-D is entered
new Thread() {
public void run() {
try {
while (System.in.read() != 4);
} catch (IOException e) {
e.printStackTrace();
}
try {
server.close();
} catch (IOException e) {
}
System.exit(0);
}
}.start();
System.out.println("Listening on: " + port);
Socket client = null;
while (true) {
try {
client = server.accept();
handle(client);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

Answer 1

To Isolate the problem, I would recommend that you run the following test code.
Apache HttpCore basic server. It's standard API and uses ServerSocket in this particular example, so there is a very small chance that it would fail on your environment ( java 7).
In case it fails you will know for sure problem is not with your code. Meanwhile I will try your code on JDK 7 on my work-machine and will update.