This is my first post here - I searched for answers everywhere,could not find a solution, and hence posting it for help!
I'm coding a Gantt chart using JFreechart - The chartPanel was created and added to an existing JPanel. However, after the JPanel validate() method, am seeing the NullPointerException in GradientBarPainter.splitHorizontalBar()
The exception is at the end of the post. Any idea of how to solve this error? Appreciate your assistance.
--------------------------
private JFreeChart createChart(final IntervalCategoryDataset dataset) {
final JFreeChart chart = ChartFactory.createGanttChart(
"Gantt Chart - ESP Job representation ", // chart title
"ESP Job name", // domain axis label
"Time", // range axis label
dataset, // data
true, // include legend
true, // tooltips
false // urls
);
CategoryPlot plot = (CategoryPlot) chart.getPlot();
CategoryItemRenderer renderer = plot.getRenderer();
renderer.setItemLabelGenerator(new IntervalCategoryItemLabelGenerator("{1}-{2}-{3}", new SimpleDateFormat(
"HH:mm:ss")));
renderer.setBaseItemLabelsVisible(true);
renderer.setBaseItemLabelPaint(Color.BLACK);
renderer.setBasePositiveItemLabelPosition(new ItemLabelPosition(
ItemLabelAnchor.INSIDE6, TextAnchor.CENTER));
return chart;
}
.....
JFreeChart chart = createChart(collection);
ChartPanel chartPanel = new ChartPanel(chart, false);
chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
chartPanel.setDomainZoomable(true);
rightPanel.add(chartPanel, BorderLayout.CENTER);
rightPanel.validate();
-------------------------------------
The JPanel "rightPanel" was added using Netbeans, and the Layout was set as borderlayout already.
Stack trace :
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at org.jfree.chart.renderer.category.GradientBarPainter.splitHorizontalBar(GradientBarPainter.java:321)
at org.jfree.chart.renderer.category.GradientBarPainter.paintBar(GradientBarPainter.java:154)
at org.jfree.chart.renderer.category.GanttRenderer.drawTask(GanttRenderer.java:574)
at org.jfree.chart.renderer.category.GanttRenderer.drawTasks(GanttRenderer.java:321)
at org.jfree.chart.renderer.category.GanttRenderer.drawItem(GanttRenderer.java:281)
at org.jfree.chart.plot.CategoryPlot.render(CategoryPlot.java:3885)
at org.jfree.chart.plot.CategoryPlot.draw(CategoryPlot.java:3653)
at org.jfree.chart.JFreeChart.draw(JFreeChart.java:1241)
at org.jfree.chart.ChartPanel.paintComponent(ChartPanel.java:1650)
at javax.swing.JComponent.paint(JComponent.java:1029)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JViewport.paint(JViewport.java:747)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JSplitPane.paintChildren(JSplitPane.java:1030)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:567)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5124)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1491)
at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1422)
at javax.swing.RepaintManager.paint(RepaintManager.java:1225)
at javax.swing.JComponent._paintImmediately(JComponent.java:5072)
at javax.swing.JComponent.paintImmediately(JComponent.java:4882)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:786)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:694)
at javax.swing.RepaintManager.access$700(RepaintManager.java:41)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1636)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:646)
at java.awt.EventQueue.access$000(EventQueue.java:84)
at java.awt.EventQueue$1.run(EventQueue.java:607)
at java.awt.EventQueue$1.run(EventQueue.java:605)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:616)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)