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Thread: JOptionPane not working?

  1. #1
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    Default JOptionPane not working?

    Hey guys,

    I wrote a program that required the use of JOptionPane. The program compiled without an issue. However, when I try to run it, I get these error messages:

    Exception in thread "main" java.awt.HeadlessException:
    No X11 DISPLAY variable was set, but this program performed an operation which requires it.
    at java.awt.GraphicsEnvironment.checkHeadless(Graphic sEnvironment.java:207)
    at java.awt.Window.<init>(Window.java:535)
    at java.awt.Frame.<init>(Frame.java:420)
    at java.awt.Frame.<init>(Frame.java:385)
    at javax.swing.SwingUtilities$SharedOwnerFrame.<init> (SwingUtilities.java:1759)
    at javax.swing.SwingUtilities.getSharedOwnerFrame(Swi ngUtilities.java:1834)
    at javax.swing.JOptionPane.getRootFrame(JOptionPane.j ava:1697)
    at javax.swing.JOptionPane.showInputDialog(JOptionPan e.java:576)
    at javax.swing.JOptionPane.showInputDialog(JOptionPan e.java:525)
    at javax.swing.JOptionPane.showInputDialog(JOptionPan e.java:475)
    at Project0.main(Project0.java:8)


    I worked on a Macintosh using terminal. Is there something that I need to download in order to make them work?


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: JOptionPane not working?

    Can you make a small, complete program that compiles, executes and show the problem?

    Did you read the API doc for that exception?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: JOptionPane not working?

    Edit: API doc?

    It is a small program that I just used just to see if the JOptionPane would work. It compiles. When I run it, it displays what I quoted in my original post

    import javax.swing.JOptionPane;
    public class Project0
    {
        public static void main(String [] args){
            String name="";
            int age=0;
     
            name=JOptionPane.showInputDialog(null, "Please enter your name: ");
            age=Integer.parseInt(JOptionPane.showInputDialog(null, "Please enter your age: "));
     
            JOptionPane.showMessageDialog(null, "Hello" + name + ". You are " + age + "years old!");
        }
    }

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: JOptionPane not working?

    java.awt.HeadlessException
    That's a class. It is documented in the Java API doc: Java Platform SE 7

    It works on my Windows7 system.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: JOptionPane not working?

    Thanks for the link.

    So I have to have this Java Platform on my computer in order for the JOptionPane to work?

  6. #6
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    Default Re: JOptionPane not working?

    You must have a java program to have gotten the error message.

    Does this mean anything: No X11 DISPLAY variable was set,
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: JOptionPane not working?

    ^I have no idea what the message means.

    Huh... looking at my applications, it seems that Java VisualM came with the Macintosh. Does that mean anything?

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    Default Re: JOptionPane not working?

    I ran it on Eclipse and it worked fine. I guess Terminal doesn't do GUIs?

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