What Port Does Java RMI Use for Connections?

What is the default port used for Java RMI connections?

Java Remote Method Invocation (RMI) allows remote communication between Java programs. This mechanism requires certain ports for the communication process to occur effectively.

public static void main(String[] args) {
    try {
        LocateRegistry.createRegistry(1099);
        // Bind your remote object in the registry
        MyRemoteObject obj = new MyRemoteObject();
        Naming.rebind("//localhost/MyRemoteObject", obj);
    } catch (RemoteException | MalformedURLException e) {
        e.printStackTrace();
    }
}

Causes

• RMI uses TCP/IP for networking, necessitating specific ports for connections.
• Default ports ensure that RMI servers can be accessed by clients without manual configuration.

Solutions

• The default port for RMI Registry is 1099, where RMI clients lookup remote objects.
• Custom ports can be set by defining a different port in the server's code.

Mistake: Assuming RMI uses random ports instead of default ones.

Solution: Remember that RMI Registry uses port 1099 by default unless specified otherwise.

Mistake: Neglecting to open the firewall for the RMI port.

Solution: Ensure that your firewall allows traffic through the necessary RMI ports.