Line Chart null value exception

[prasad_psl]

Hi

When i am using line chart to show the valuesfrom xml through xpath,

 there is a problem when i have null value in the varible .

it throws a null value exception.

the exception is like that

 

Error filling print... null

anyone find the way to handle such a problem please suggest me.

java.lang.NullPointerException 
    at net.sf.jasperreports.engine.data.JRXmlDataSource.convertStringValue(JRXmlDataSource.java:340) 
    at net.sf.jasperreports.engine.data.JRXmlDataSource.getFieldValue(JRXmlDataSource.java:317) 
    at net.sf.jasperreports.engine.fill.JRFillDataset.setOldValues(JRFillDataset.java:813) 
    at net.sf.jasperreports.engine.fill.JRFillDataset.next(JRFillDataset.java:777) 
    at net.sf.jasperreports.engine.fill.JRBaseFiller.next(JRBaseFiller.java:1412) 
    at net.sf.jasperreports.engine.fill.JRHorizontalFiller.fillReport(JRHorizontalFiller.java:119) 
    at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:891) 
    at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:123) 
    at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:420) 
    at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:256) 
    at it.businesslogic.ireport.IReportCompiler.run(IReportCompiler.java:1049) 
    at java.lang.Thread.run(Unknown Source) 

Print was not filled. Try using an EmptyDataSource...