Getting NullPointer exception for saveChartAsPNG in JSP page

[TheHaas]

Here is the code part of my JSP:

Code: Select all

<%

	com.workpoint.client.ClientContext context = com.workpoint.client.ClientContext.createContext();
	
	context.open(sDSN,sResourceID,sPassword);

	JFreeChart chart = ResourceReport.getChart(context,"20040117","20040217");
	ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
	String filename = ServletUtilities.saveChartAsPNG(chart, 500, 300, info, session);
		
	
	String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;
	
%>

And I get a NullPointException when trying to save it:

Code: Select all

ava.lang.NullPointerException
	at org.jfree.chart.ChartUtilities.writeChartAsPNG(Unknown Source)
	at org.jfree.chart.ChartUtilities.saveChartAsPNG(Unknown Source)
	at org.jfree.chart.ChartUtilities.saveChartAsPNG(Unknown Source)
	at org.jfree.chart.servlet.ServletUtilities.saveChartAsPNG(Unknown Source)
	at org.apache.jsp.ResourceChart_jsp._jspService(ResourceChart_jsp.java:89)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

Anyone have any ideas?