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Index › Programming Questions & Help › Programs › NullPointerException in PApplet size method
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NullPointerException in PApplet size method (Read 497 times)
preeti_munot
NullPointerException in PApplet size method
Jul 6th, 2006, 3:28pm  
Hi,
I have developed an applet that runs in a browser.
When I open the html page using an web server like Tomcat, opening any number of instances of the page works fine.
But when I open the same html page directly(not using the URL) twice, I get a null pointer exception as :

java.lang.NullPointerException
at processing.core.PApplet.size(PApplet.java:848)
at com.persistent.chart.ui.BarGraph2D.calculateGraphParameters(BarGraph2D.java:113)

at com.persistent.chart.ui.BarGraph2D.refreshChart(BarGraph2D.java:1085)
at com.bms.ui.chartpanels.ChartPanel.setChartData(ChartPanel.java:43)
at com.bms.ui.AppletFramework.updateChartData(AppletFramework.java:166)
at com.bms.ui.AppletFramework.valueChanged(AppletFramework.java:207)
at javax.swing.JTree.fireValueChanged(Unknown Source)
at javax.swing.JTree$TreeSelectionRedirector.valueChanged(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(Unknown Source)
at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(Unknown Source)
at javax.swing.JTree.setSelectionPaths(Unknown Source)
at javax.swing.JTree.setSelectionRows(Unknown Source)
at javax.swing.JTree.setSelectionRow(Unknown Source)
at com.bms.ui.AppletFramework.buildUI(AppletFramework.java:101)
at com.bms.ui.AppletFramework.initialize(AppletFramework.java:59)
at com.bms.ui.AppletFramework.init(AppletFramework.java:44)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)


Has anyone else faced a similar problem?
Any pointers would be helpful.
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jonbro
Re: NullPointerException in PApplet size method
Reply #1 - Jul 20th, 2006, 2:33pm  
could you post your code please?
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