JSlider, labelTable, maximum int value and Java 6 problem
I ran into a problem with the JSlider and labelTable when using the maximum int value (2147483647). The JSlider doesn't get painted and exceptions are thrown (see the end of this message).
I run the code from Eclipse, as a JavaBean. The jre used is:
java version "1.6.0_01"
Java(TM) SE Runtime Environment (build 1.6.0_01-b06)
Java HotSpot(TM) Client VM (build 1.6.0_01-b06, mixed mode, sharing)
The code below does work when using a smaller value than the max int. It also works with the max int when using an earlier version of java, like 1.5.
Could this be considered a bug?
import java.awt.GridBagLayout;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import java.awt.GridBagConstraints;
import java.util.Hashtable;
publicclass SliderMaxextends JPanel{
// doesn't work with this, maximum int value
privatestaticfinalint MAX_INT_VALUE = 2147483647;
// works with this value
// private static final int MAX_INT_VALUE = 2147483646;
privatestaticfinallong serialVersionUID = 1;
private JSlider jSlider =null;
/**
* This is the default constructor
*/
public SliderMax(){
super();
initialize();
}
/**
* This method initializes this
*
* @return void
*/
privatevoid initialize(){
GridBagConstraints gridBagConstraints =new GridBagConstraints();
gridBagConstraints.fill = GridBagConstraints.VERTICAL;
gridBagConstraints.gridy = 0;
gridBagConstraints.weightx = 1.0;
gridBagConstraints.gridx = 0;
this.setSize(200, 50);
this.setLayout(new GridBagLayout());
this.add(getJSlider(), gridBagConstraints);
}
/**
* This method initializes jSlider
*
* @return javax.swing.JSlider
*/
private JSlider getJSlider(){
if (jSlider ==null){
jSlider =new JSlider();
Hashtable<Integer, JLabel> labelTable =new Hashtable<Integer, JLabel>();
labelTable.put(new Integer(0),new JLabel("Start"));
// this label doesn't get painted even if you
// comment out the line jSlider.setMaximum(MAX_INT_VALUE);
// which causes the exceptions
labelTable.put(new Integer(MAX_INT_VALUE),new JLabel("End"));
jSlider.setLabelTable(labelTable);
jSlider.setPaintLabels(true);
// this causes the exceptions
jSlider.setMaximum(MAX_INT_VALUE);
}
return jSlider;
}
}
I get these exceptions:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.basic.BasicSliderUI.calculateTrackBuffer(Unknown Source)
at javax.swing.plaf.basic.BasicSliderUI.calculateGeometry(Unknown Source)
at javax.swing.plaf.basic.BasicSliderUI.paint(Unknown Source)
at javax.swing.plaf.ComponentUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JLayeredPane.paint(Unknown Source)
at javax.swing.JComponent.paintChildren(Unknown Source)
at javax.swing.JComponent.paintToOffscreen(Unknown Source)
at javax.swing.BufferStrategyPaintManager.paint(Unknown Source)
at javax.swing.RepaintManager.paint(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at java.awt.GraphicsCallback$PaintCallback.run(Unknown Source)
at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)
at sun.awt.SunGraphicsCallback.runComponents(Unknown Source)
at java.awt.Container.paint(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.seqPaintDirtyRegions(Unknown Source)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.basic.BasicSliderUI.calculateTrackBuffer(Unknown Source)
at javax.swing.plaf.basic.BasicSliderUI.calculateGeometry(Unknown Source)
at javax.swing.plaf.basic.BasicSliderUI$Handler.componentResized(Unknown Source)
at java.awt.Component.processComponentEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.basic.BasicSliderUI.calculateTrackBuffer(Unknown Source)
at javax.swing.plaf.basic.BasicSliderUI.calculateGeometry(Unknown Source)
at javax.swing.plaf.basic.BasicSliderUI$Handler.componentResized(Unknown Source)
at java.awt.Component.processComponentEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.basic.BasicSliderUI.calculateTrackBuffer(Unknown Source)
at javax.swing.plaf.basic.BasicSliderUI.calculateGeometry(Unknown Source)
at javax.swing.plaf.basic.BasicSliderUI.paint(Unknown Source)
at javax.swing.plaf.ComponentUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintToOffscreen(Unknown Source)
at javax.swing.BufferStrategyPaintManager.paint(Unknown Source)
at javax.swing.RepaintManager.paint(Unknown Source)
at javax.swing.JComponent._paintImmediately(Unknown Source)
at javax.swing.JComponent.paintImmediately(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.RepaintManager.seqPaintDirtyRegions(Unknown Source)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
