[DrJava] [ drjava-Bugs-1335905 ] NullPointerException while using interactions window

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Bugs item #1335905, was opened at 2005-10-23 20:04
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Category: Other
Group: Crashes
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: NullPointerException while using interactions window

Initial Comment:
DrJava Version : 20050814-2234
On Mac OS10.4, JDK 1.5

Hi, I don't have a sourceforge account, but my e-mail
is: tim...@ho....  I was doing my
homework, using the interaction and the bug came up.
(Running the main method from the interaction)

Here's the trace and the source code:



java.lang.NullPointerException
	at
javax.swing.text.StyledEditorKit$AttributeTracker.updateInputAttributes(StyledEditorKit.java:223)
	at
javax.swing.text.StyledEditorKit$AttributeTracker.caretUpdate(StyledEditorKit.java:258)
	at
javax.swing.text.JTextComponent.fireCaretUpdate(JTextComponent.java:367)
	at
javax.swing.text.JTextComponent$MutableCaretEvent.fire(JTextComponent.java:3232)
	at
javax.swing.text.JTextComponent$MutableCaretEvent.stateChanged(JTextComponent.java:3254)
	at
javax.swing.text.DefaultCaret.fireStateChanged(DefaultCaret.java:776)
	at apple.laf.AquaCaret.fireStateChanged(AquaCaret.java:50)
	at
javax.swing.text.DefaultCaret.changeCaretPosition(DefaultCaret.java:1206)
	at
javax.swing.text.DefaultCaret.handleSetDot(DefaultCaret.java:1114)
	at
javax.swing.text.DefaultCaret.setDot(DefaultCaret.java:1095)
	at
javax.swing.text.DefaultCaret.setDot(DefaultCaret.java:1023)
	at
javax.swing.text.JTextComponent.setCaretPosition(JTextComponent.java:1400)
	at
edu.rice.cs.drjava.ui.AbstractDJPane.setCaretPosition(AbstractDJPane.java:135)
	at
edu.rice.cs.drjava.ui.AbstractConsoleController.moveTo(AbstractConsoleController.java:366)
	at
edu.rice.cs.drjava.ui.AbstractConsoleController.moveToEnd(AbstractConsoleController.java:350)
	at
edu.rice.cs.drjava.ui.AbstractConsoleController$CaretUpdateListener$1.run(AbstractConsoleController.java:232)
	at
java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
	at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:267)
	at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:196)
	at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:190)
	at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:182)
	at
java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

//CS440DL-Fall 2006
//Assignment2--Ting-Ku Liu 
//calculation of 3.14159

import java.util.Scanner;

public class assi2 {
  public static void main(String[] arg) {
    Scanner input = new Scanner(System.in);
    
    double pi;
    double x = 1;
    double z = 1;
    
    pi = 0;
    
    int numTimes = 0;
//    while (pi < 3.14159) {
  
    while(pi < 3.14159 || pi >= 3.1416) {
      
      double term = (4/x)*z;
      pi = pi + term;
      
      System.out.println(term +", " + pi);
      x = x+2;
      z = z*-1;
      numTimes = numTimes + 1;
    }
    System.out.println("Took "+numTimes+" iterations!!!!");
  }
  
}




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