If tried to make the code with my problem as short as possible.
Problem: When I fill in a wrong number in the textfield (i.e. anything
except a float between 5 and 30) and next I press the up or down button from
the spinner, then the warning popup appears, but the spinner keeps spinning.

grtz and thx,
Hans

Here is the a part of my code, I 've tried to make it as short as possible.
Problem: When I fill in a wrong value in the textfield (i.e. anything except
a float between 5 and 30) and next I click on the up or down button of the
spinner, then a warning popup appears, but the spinner keeps spinning up or
down until the maximum value or the minimum value is reached.

import java.awt.Toolkit;
import javax.swing.InputVerifier;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JSpinner;
import javax.swing.JTextField;
import javax.swing.SpinnerNumberModel;

public class JSpinnerProblem extends JFrame {
MyVerifier verifier = new MyVerifier();
JTextField text;

public JSpinnerProblem() {
 super();
 getContentPane().setLayout(null);
 setSize( 100,100);
 text = new JTextField();
 text.setBounds(5,5,80,20);
 getContentPane().add(text);
 //Verifier verifies if textfield contains a float between 5 and 30;
 text.setInputVerifier(verifier);

 SpinnerNumberModel nightModel = new SpinnerNumberModel(13,5,30,0.1);
 JSpinner nightSpinner = new JSpinner(nightModel);

 nightSpinner.setBounds(5,30,80,20);
 getContentPane().add(nightSpinner);

 show();
}

public class MyVerifier extends InputVerifier {
  String message;

  public MyVerifier() {
   super();
  }

  public boolean verify(JComponent input) {
   return checkField(input, true);
  }

  private boolean checkField(JComponent input, boolean b) {
   if (input == text) {
    return checkText(b);
   }
   return true;
  }

  private boolean checkText(boolean change){
   boolean wasValid = true;
   float amount = 13;

   //Parse the value.
   try {
    amount = Float.parseFloat(text.toString());
   } catch (NumberFormatException pe) {
    message = "Invalid number format in text field";
    return false;
   }

   //Value was invalid.
   if ((amount < 5) || (amount > 30)) {
    wasValid = false;
    if (amount < 5) {
     message = "Number too small";
    } else { //amount is greater than 30
     message = "Number too large";
    }
   }

   //Whether value was valid or not, format it nicely.
   if (change && !wasValid) {
    text.setText(Float.toString(amount));
   }

   return wasValid;

  }

  public boolean shouldYieldFocus(JComponent input){
   boolean inputOK = verify(input);

   if (inputOK) {
    return true;
   }

   //Beep and then tell whoever called us that we don't
   //want to yield focus.
   Toolkit.getDefaultToolkit().beep();

   //Avoid possible focus-transfer problems when bringing up
   //the dialog by temporarily removing the input verifier.
   //This is a workaround for bug #4532517.
   input.setInputVerifier(null);
   //Pop up the message dialog.
   JOptionPane.showMessageDialog(null, //no owner frame
            message, //text to display
            "Invalid Value", //title
            JOptionPane.WARNING_MESSAGE);

   //Reinstall the input verifier.
   input.setInputVerifier(this);

   return false;

  }
}

public static void main(String[] args){
 JSpinnerProblem window = new JSpinnerProblem();
}

}

usenet@chka.de (Christian Kaufhold) wrote in news:0T10ttqtIkemNmc0
@uni.chka.de:

That's the one.
Thank you for this link, I've just tested the suggested solution and it
seems to work for me.

grtz,
Hans