I have a Java exception: java.lang.NumberFormatException

Question

Edit: I was forgot to change the start class to the client package in Eclipse!

This is odd, it works fine in eclipse, then I export it and it gives me a java.lang.NumberFormatException .

The pastebin of Start.java

The dump:

Exception in thread "main" java.lang.NumberFormatException: For input string: "gudenau.no-ip.org"

        at java.lang.NumberFormatException.forInputString(Unknown Source)
        at java.lang.Integer.parseInt(Unknown Source)
        at java.lang.Integer.<init>(Unknown Source)
        at com.gudenau.ChatServer.Start.main(Start.java:141)

I don't get why it works in eclipse but not with a batch file.

The code I use for the socket is

socket = new Socket("gudenau.no-ip.org", 45678);

I will change this to not be static later.

    try {
        socket = new Socket("gudenau.no-ip.org", 45678);

        out = new PrintWriter(socket.getOutputStream(), true);
        in = new BufferedReader(new InputStreamReader(
                socket.getInputStream()));
    } catch (NumberFormatException e) {
        e.printStackTrace();
        System.exit(-1);
    } catch (UnknownHostException e) {
        e.printStackTrace();
        System.exit(-2);
    } catch (IOException e) {
        e.printStackTrace();
        System.exit(-3);
    }

Edit the code around 141:

@Override
public void windowIconified(WindowEvent arg0) {
    // TODO Auto-generated method stub

}

@Override
public void windowOpened(WindowEvent arg0) {
    // TODO Auto-generated method stub

}

Shure: try { socket = new Socket("gudenau.no-ip.org", 45678); out = new PrintWriter(socket.getOutputStream(), true); in = new BufferedReader(new InputStreamReader( socket.getInputStream())); } catch (NumberFormatException e) { e.printStackTrace(); System.exit(-1); } catch (UnknownHostException e) { e.printStackTrace(); System.exit(-2); } catch (IOException e) { e.printStackTrace(); System.exit(-3); } — gudenau
– gudenau, Commented Jun 7, 2012 at 17:03
Your code is OK. Are you sure you don't have a firewall on which you might have authorized Eclipse ? — Denys Séguret
– Denys Séguret, Commented Jun 7, 2012 at 17:11
Are you calling Integer.parseInt() or any other method near line 141 in your code ? It would be better if you place SSCCE — mprabhat
– mprabhat, Commented Jun 7, 2012 at 17:19

Paul Cichonski · Accepted Answer · 2012-06-07 17:39:12Z

1

The code you added for line 141 doesn't seem to be correct (I could be wrong). The error is coming from a class called Start (line 141). I am guessing you are trying to create an Integer there, but from a String that does not parse into an Integer.

You may want to add a debug point at that method (or some System.outs) to see what you are actually trying to convert to an Integer.

Update: you are looking at the wrong package, you need com.gudenau.ChatServer, not com.gudenau.ChatCleint.

edited Jun 7, 2012 at 17:39

answered Jun 7, 2012 at 17:20

Paul Cichonski

3881 silver badge6 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Paul Cichonski Over a year ago

Update after reading your pastebin. The class you added in there has a package of "com.gudenau.ChatCleint", you need to look at the class with the package of "com.gudenau.ChatServer".

gudenau Over a year ago

But the problem is in the cleint... How does that help?

Attila Over a year ago

@gudenau - the exception is thrown from com.gudenau.ChatServer.Start.main() at line 141

gudenau Over a year ago

Oh, I think I know how to fix this!

Attila · Accepted Answer · 2012-06-07 17:13:01Z

0

The stack trace you show indicates that the exception is from line 141 of Start.main(), which directly instantiates an Integer object. Since the Socket constructor is taking a primitive int, this cannot be the actual problem. Please update your post with the code surrounding line 141 of Start.main() for a better answer

answered Jun 7, 2012 at 17:13

Attila

28.9k3 gold badges50 silver badges58 bronze badges

Comments

gudenau · Accepted Answer · 2012-06-07 17:52:41Z

0

I needed to change the start class in the eclipse jar exporter! Oops!

answered Jun 7, 2012 at 17:52

gudenau

5386 silver badges20 bronze badges

Collectives™ on Stack Overflow

I have a Java exception: java.lang.NumberFormatException

3 Answers 3

4 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

4 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related