Unable to run a java program...

Question

Hi.
I am trying to run a server program that I have implemented, but I'm having some trouble. When I click on the run button, I get the following pop-up message:
Could not find the main method. Program will exit!
On the console it says the following:
java.lang.NoSuchMethodError: main
Exception in thread "main"
Below is the beginning portion of my server class:
public class JamServer
     public int groupNum = 0;
     int serverPort = 9876;
     private ServerSocket ss;
     //list of client handling threads
     //Vector handlers;
     //list of users
     public Vector users;
     public void main(String args[]) {
     try{
          ss = new ServerSocket(serverPort);
          while(true){
          Socket s = ss.accept();
          User usr = new User();
          usr.setOutput(new DataOutputStream(s.getOutputStream()));
          //users.add(usr);
     new JamServerThread(this,s,usr);
     }catch(IOException e){
          System.err.println("Could not listen on port: "+ serverPort);
          System.exit(-1);
Does anyone have any idea why it would say it could not find the main method? It's clearly there. Please help!!
Thanks in advance.

Answer 1

To further explain, main must be static if you want the JVM to exedute it. Without the static keyword, your main method is simply another instance method which can only be accessed once you have an instance of your class. Static methods can be accessed without instanciating the class. So, the JVM expects to find a method called "main" that is both public and static, takes a String array and returns void.
HTH