Error with server

Joined
Jun 14, 2021
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I run my java server and receive an error, I am not sure how to fix it and wish to receive recommendations on how to fix it. The following is shown indicating line 39 in my code.

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0

Code:
import java.net.*;
import java.io.*;

public class GreetingServer extends Thread {
   private ServerSocket serverSocket;
  
   public GreetingServer(int port) throws IOException {
      serverSocket = new ServerSocket(port);
      serverSocket.setSoTimeout(10000);
   }

   public void run() {
      while(true) {
         try {
            System.out.println("Waiting for client on port " +
               serverSocket.getLocalPort() + "...");
            Socket server = serverSocket.accept();
            
            System.out.println("Just connected to " + server.getRemoteSocketAddress());
            DataInputStream in = new DataInputStream(server.getInputStream());
            
            System.out.println(in.readUTF());
            DataOutputStream out = new DataOutputStream(server.getOutputStream());
            out.writeUTF("Thank you for connecting to " + server.getLocalSocketAddress()
               + "\nGoodbye!");
            server.close();
            
         } catch (SocketTimeoutException s) {
            System.out.println("Socket timed out!");
            break;
         } catch (IOException e) {
            e.printStackTrace();
            break;
         }
      }
   }
  
   public static void main(String[] args) {
      int port = Integer.parseInt(args[0]);
      try {
         Thread t = new GreetingServer(port);
         t.start();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}
 
Joined
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What do you want this line to do ?

Java:
int port = Integer.parseInt(args[0]);
 
Joined
Jun 14, 2021
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Yes I want to pass in the arguments, being the hostname and port. Then it should be args[2] although I receive an exception after compiling successfully then running 'java GreetingServer hostname 22'.
Code:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 2 out of bounds for length 2
    at GreetingServer.main(GreetingServer.java:39)
 
Joined
Mar 28, 2022
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Java:
public static void main(String[] args) {
      System.out.println(args[0]); // debug
      int port = Integer.parseInt(args[0]);
      try {
 

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