[Solved] Problem passing datasource to subreport

I set the REPORT_PARAMETERS_MAP in the subreport parameters section. With this I can access all parameters from the master report in the subreport, no problems in there. Now what I need to do, is to get the same datasource from the master report in the subreport. I tried setting the subreport datasource expressions as $P{REPORt_DATA_SOURCE}, but still couldn't read the field I wanted, so I tried setting the datasource in my java code, as a parameter, then I set the datasource expression as $P{mydatasource}, but still the field value in my subreport returns null.

Any ideas?

I am using a java bean describing the fields I need to show in the subreport. Then I created a JRBeanDataSourceCollection with this bean (called dataSource), and then added the datasource to the report as a parameter, as in the following code:

JRBeanCollectionDataSource jrDataSource = new JRBeanCollectionDataSource(dataSource);
String pathToRel = request.getSession().getServletContext().getRealPath(pathToReport+jasperFileName+".jasper");
parameters.put("mydatasource", jrDataSource);

Those fields in the java bean are the ones I need to read in the subreport, and therefore why I am trying to add the mydatasource parameter as a datasource to the subreport.

But still, all I get are null fields... any ideas?

In the end I created an arraylist with just one element, the bean I wanted as a datasource for my subreport, like this:

ArrayList<Object> data = new ArrayList<Object>();
data.add(myBean);
JRBeanCollectionDataSource DS = new JRBeanCollectionDataSource(data);
parameters.put("formData", DS);

Then I added a parameter to my master report called "formData" of the exact same type as a datasource parameter.

The problem I was having was because I was trying to do code above in a separate method, and for some wierd reason it didn't work. So I just left all in the same method that create the other parameters, and it did the trick.

I have done the same like above post,

In Subreport >>>>>>>>>>>>>>>>> put Following

very important >>> below address is field in my addressess List in Main Report

    <field name="address" class="java.lang.String"/>

and In Detail Section Put Following

            <textField isStretchWithOverflow="true" isBlankWhenNull="true">
                <reportElement x="142" y="20" width="92" height="20"/>
                <textElement>
                    <font size="12"/>
                </textElement>
                <textFieldExpression class="java.lang.String"><![CDATA[$F{address}]]></textFieldExpression>
            </textField>

But F{address} is expecting from  main JavaBean not from sub JavaBean.

Caused by: java.lang.NoSuchMethodException: Unknown property 'SubVoFeild1' on class 'class model.MainVo'.

I found there is a bug which is still open on the same issue

http://jasperforge.org/projects/ireport/tracker/view.php?id=4480

Please guide me any alternative solution for this issue.

Thank you,

Sowjanya