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Accessing an array using JavaBean datasource

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By: Strat - larynf

Accessing an array using JavaBean datasource

2005-10-17 13:50

Have these two classes and using JavaBean datasource, I need to display the contents of the details field in my report.


ClassA {

private ClassB[] variable1;




ClassB {

private String details;


public String getDetails() {

return details;



public void setDetails(String str) {

details = str;




Currently subclassed a JRAbstractBeanDataSourceProvider and in the method public JRDataSource create(JasperReport report) throws JRException ( ), I return JRBeanCollectionDataSource(list) where list is an ArrayList of ClassA


I created ((com.test.AgreementType[])$F{agreementType})[0].getDetails() as a variable in the report template and dropped it on my report template. It compiles but I get this exception when I run the report


Compiling to file... C:deveclipseworkspacedemo2Agreement_Bean.jasper -> C:deveclipseworkspacedemo2Agreement_Bean.java it.businesslogic.ireport.ReportClassLoader@372b61 Compilation running time : 235 Filling report... Error filling print... java.lang.ClassCastException: [Lcom.test.AgreementType; at Agreement_Bean.evaluate(Agreement_Bean:154) at net.sf.jasperreports.engine.fill.JRCalculator.evaluate(JRCalculator.java:608) at net.sf.jasperreports.engine.fill.JRCalculator.calculateVariables(JRCalculator.java:145) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillDetail(JRVerticalFiller.java:576) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:226) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:129) at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:953) at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:89) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:428) at it.businesslogic.ireport.IReportCompiler.run(IReportCompiler.java:637) at java.lang.Thread.run(Unknown Source





By: Strat - larynf

RE: Accessing an array using JavaBean datasou

2005-10-20 12:06

So I noticed a typo in my previous email. It should read...


I created ((com.test.ClassB[])$F{variable1})[0].getDetails() as a variable in the report template and dropped it on my report template.


I got it to work but only after writing a test program which calls the JasperReports API directly. If I run it from within iReport, it still reports a class cast exception.


But here's another question

I can access the first element using the above expression. How do I get iReport to loop thru' all the instance of variable1 ( and then access getDetails() for each instance) since the above expression will only get me the first ClassB object ?

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