Hi!
I encountered a problem using JFreeChart Extension II along with JFreeChart
1.0.9 (and the same for JFreeChart 1.0.0).
More precisely: jcommon-1.0.12.jar, jfreechart-1.0.9.jar,
jfreechart-extension-client-1.0.jar, jfreechart-extension-server-1.0.jar
There is a nullpointer exception when a mouse event occurs and an
IChartEventListener has been registered.
This appears to be the same problem which has previously been posted on
[ULC-developer]
(by Eugene Coelho, Wed, 19 Jul 2006 01:20:54 -0700).
Unfortunately, no answer has been posted.
To produce this error I added an ULCJFreeChart to the template created by
New ULC Project Wizard > Simple dialog ULC application template in
Eclipse.
Please see below for the code and the stack trace.
Thanks and kind regards,
Kevin Hirschmann
Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException
at
com.canoo.ulc.community.jfreechart.client.UIJFreeChart$MouseEventHandler.fin
dEntity(UIJFreeChart.java:184)
at
com.canoo.ulc.community.jfreechart.client.UIJFreeChart$MouseEventHandler.mou
seClicked(UIJFreeChart.java:162)
at
java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:212)
at java.awt.Component.processMouseEvent(Component.java:5520)
at
javax.swing.JComponent.processMouseEvent(JComponent.java:3135)
at
com.ulcjava.base.client.UILabel$BasicLabel.processMouseEvent(UILabel.java:38
)
at java.awt.Component.processEvent(Component.java:5282)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3984)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3819)
at
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at
java.awt.LightweightDispatcher.processMouseEvent(Container.java:3901)
at
java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1791)
at java.awt.Component.dispatchEvent(Component.java:3819)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at
com.ulcjava.base.client.FilteringEventQueue.dispatchEvent(FilteringEventQueu
e.java:61)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.ja
va:242)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java
:163)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at
java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
public class TestChartEventsBoxPane extends ULCBoxPane {
// The structure of the class enables its visualization with ULC
Visual Editor Plugin
private ULCButton ulcButton = null;
private ULCLabel ulcLabel = null;
private ULCJFreeChart chartComponent = null;
public TestChartEventsBoxPane() {
initialize();
}
private void initialize() {
setHorizontalGap(5);
set(0, 1, 1, 1, com.ulcjava.base.shared.IDefaults.BOX_CENTER_CENTER,
getUlcButton());
set(0, 0, 1, 1, com.ulcjava.base.shared.IDefaults.BOX_CENTER_CENTER,
getUlcLabel());
set(2, 2, 1, 1, com.ulcjava.base.shared.IDefaults.BOX_CENTER_CENTER,
getULCJFreeChart());
}
private ULCButton getUlcButton() {
if (ulcButton == null) {
ulcButton = new ULCButton();
ulcButton.setText("Say Hello");
ulcButton.addActionListener(new IActionListener() {
public void actionPerformed(ActionEvent e) {
new ULCAlert("Title","Hello!","OK").show();
}
});
}
return ulcButton;
}
private ULCLabel getUlcLabel() {
if (ulcLabel == null) {
ulcLabel = new ULCLabel();
ulcLabel.setText("Click button for greeting");
}
return ulcLabel;
}
private ULCJFreeChart getULCJFreeChart() {
if (this.chartComponent == null) {
this.chartComponent = new
ULCJFreeChart();
double[][] data = new
double[][] { { 4257, 4058, 3357 }, { 257, 58, 357 } };
CategoryDataset dataset =
DatasetUtilities.createCategoryDataset(
new String[] { "prognose", "real" },
new String[] { "02.09.2008", "03.09.2008", "04.09.2008" },
data);
JFreeChart chart1 =
ChartFactory.createBarChart("TEST", "", "", dataset,
PlotOrientation.VERTICAL, false,
false, false);
this.chartComponent.setChart(chart1, new Dimension(600, 400));
this.chartComponent.addChartComponentListener(new IChartComponentListener()
{
public void
chartResized(UlcChartComponentEvent event) {
System.out.println("chartResized: latest chart size: " +
event.getChartComponentSize());
}
});
this.chartComponent.addChartEventListener(new IChartEventListener() {
public void
chartClicked(UlcChartEvent event) {
System.out.println("chart clicked");
}
public void
chartEntityClicked(UlcChartEvent event) {
ChartEntity entity = event.getChartEntity();
System.out.println("entity coordinates: " + entity.getShapeCoords());
}
public void
chartZoomed(UlcChartEvent arg0) {
;
}
});
}
return chartComponent;
}
}
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