IOException Throw/Catch error. Makes no sense.

Question

This is the error I'm getting:
unreported exception java.io.IOException; must be caught or declared to be thrown
The problem is, it IS being caught AND declared to be thrown by the class using it.
Here's my Main class:
package Main;
import java.net.*;
import java.io.*;
public class Main {
    static String GameName = "[gamename]";
    static Integer Port = 1234;
    public static void main(String[] args) {
        // Non-Static Vars
        String PrintMsg;      
        PrintMsg = "Welcome to the "+GameName+" server application.\n";
        System.out.println(PrintMsg);
        Server serv = new Server(Port);
        serv.Init();
}The line displaying the error is the "serv.Init();" line.
Here's my Server class:
package Main;
import java.net.*;
import java.io.*;
public class Server {
    private String PrintMsg;
    private Integer Port;
    Server(int Port) {
        System.out.println("Server class created.\n");
        this.Port = Port;
    public void Init() throws IOException {
        ServerSocket serverSocket = null;
        // Create new socket on port 1234
        try {
            serverSocket = new ServerSocket(Port);
        } catch (IOException e) {
            System.err.println("Could not create socket.");
            System.exit(1);
        PrintMsg = "Socket created on port "+Port+".\nListening...";
        System.out.println(PrintMsg);
        Socket clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        PrintMsg = "Client accepted.";
        System.out.println(PrintMsg);
        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(
                    new InputStreamReader(
                    clientSocket.getInputStream()));
        String inputLine, outputLine;
        Protocols.Login kkp = new Protocols.Login();
        outputLine = kkp.processInput(null);
        out.println(outputLine);
        while ((inputLine = in.readLine()) != null) {
             outputLine = kkp.processInput(inputLine);
             out.println(outputLine);
             if (outputLine.equals("Bye."))
                break;
        out.close();
        in.close();
        clientSocket.close();
        serverSocket.close();
}It is indeed strange because it's based on a tutorial from Sun. This is my first time programming in Java, but I have a strong C++ background.
Any idea what's going on? This error is not displayed when I try and build, only in the code editor. When I try and run the application, it freezes.

Answer 1

For your Server class Init() method, it declares to throw IOException.
So in your Main class, you should have a try catch block to wrap serv.Init();
i.e.
Server serv = new Server(Port);
        try {
            serv.Init()
        } catch (IOException e) {
            // do some exception handling here
        }