FULL PRODUCT VERSION :
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
I was trying to make JTextField,JTextArea or JPasswordField movable and resizable using mousePressed and mouseDragged Events . . .
when i move are resize this components
NullPointerException occures .

seems to be problem with the caret . ..


ERROR MESSAGES/STACK TRACES THAT OCCUR :

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at javax.swing.text.DefaultCaret.moveCaret(DefaultCaret.java:311)
        at javax.swing.text.DefaultCaret.mouseDragged(DefaultCaret.java:565)
        at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:303)
        at java.awt.Component.processMouseMotionEvent(Component.java:6086)
        at javax.swing.JComponent.processMouseMotionEvent(JComponent.java:3278)
        at java.awt.Component.processEvent(Component.java:5807)
        at java.awt.Container.processEvent(Container.java:2058)
        at java.awt.Component.dispatchEventImpl(Component.java:4410)
        at java.awt.Container.dispatchEventImpl(Container.java:2116)
        at java.awt.Component.dispatchEvent(Component.java:4240)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4003)

        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
        at java.awt.Container.dispatchEventImpl(Container.java:2102)
        at java.awt.Window.dispatchEventImpl(Window.java:2429)
        at java.awt.Component.dispatchEvent(Component.java:4240)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)

        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)

        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Temp extends JFrame
{
Point location;
MouseEvent pressed;
JTextField comp;
int wi,hi;
boolean set=false;
public Temp()
{
super("Test");
getContentPane().setLayout(null);
comp = new JTextField("Hai",15);
comp.setLocation(20,20);
comp.setSize(100,50);
makeMovable();
getContentPane().add(comp);
setSize(400,400);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private void makeMovable()
{
comp.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent me)
{
pressed = me;
int xh= comp.getX()+comp.getWidth();
int yh = comp.getY()+comp.getHeight();
set=false;
if(pressed.getX()<=xh&&(pressed.getX()>=comp.getWidth()-10)&&pressed.getY()<=yh&&(pressed.getY()>=comp.getHeight()-10))
{
comp.setCursor(new Cursor(Cursor.SE_RESIZE_CURSOR));
wi = comp.getWidth();
hi = comp.getHeight();
set=true;
}
}
public void mouseReleased(MouseEvent me)
{
comp.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}

});
comp.addMouseMotionListener(new MouseMotionAdapter(){
public void mouseDragged(MouseEvent me)
{
if(!set)
{
location = comp.getLocation(location);
int x = location.x - pressed.getX() + me.getX();
int y = location.y - pressed.getY() + me.getY();
if(x<0)
x=0;
if(y<0)
y=0;
if(x>(comp.getParent().getWidth()-comp.getWidth()))
x=comp.getParent().getWidth()-comp.getWidth();
if(y>(comp.getParent().getHeight()-comp.getHeight()))
y=comp.getParent().getHeight()-comp.getHeight();
comp.setLocation(x, y);
comp.updateUI();
comp.validate();
}
else
{
int w = wi+me.getX()-pressed.getX();
int h = hi+me.getY()-pressed.getY();
if(w<25)
{
w=25;
}
if(h<25)
{
h=25;
}
comp.setSize(w,h);
comp.updateUI();
comp.validate();
}
}
});
}
   public static void main( String[] args )
   {
new Temp();
   }
}

---------- END SOURCE ----------