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Editorial Team
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Asked: 2026-05-20T04:38:22+00:00

I create a new thread that runs the following code: public static void startServer()

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I create a new thread that runs the following code:

public static void startServer() throws IOException {
    serverSocket = new ServerSocket(55000);
    Socket clientSocket = serverSocket.accept(); 
}

The above code is run in a thread. Now, in my main class, I successfully create a socket
connection to the server and I have checked it’s integrity which is fine. here is the code:

Socket testServerSocket = new Socket("127.0.0.1", 55000);
assertEquals("/127.0.0.1", testServerSocket.getInetAddress().toString());
assertEquals(55000, testServerSocket.getPort());

This runs perfect. Then, again from my main, I kill the server connection that closes the connection on the server side. However the following code keeps failing:
assertEquals(false, testServerSocket.isBound());

It keeps returning true. Likewise, if I check the remote IP address for the connection, it doesn’t return null, but rather ‘/127.0.0.1’. Any ideas why this might be happening? Many thanks for your help

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1 Answer

  1. Editorial Team

    I’m not an expert on sockets (I know what they are, but haven’t ever used sockets on Java, only with C on Linux), but like JavaDoc for java.net.Socket states, ‘A socket is an endpoint for communication between two machines’. So while closing server-side socket does destroy the connection between the two sockets (server- and client-side), your client-side socket is still bound, hence the isBound() is returning true. Maybe you meant to call isConnected() or isClosed()?

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