How to Display a JavaBean\'s List in JasperReports\' Detail Band?

JavaBeans Containing java.util.List: Display in JasperReports

Problem

A JavaBean contains a java.util.List. How can this list's data be displayed in the Detail band of a JasperReports document?

Solution

1. Use _THIS Expression: Utilize the _THIS expression to access the JavaBean's members.
2. Apply jr:list Component: Incorporate a jr:list component in the Detail band to iterate through the list's items.

Working Sample Code

// Java source to generate the report
...

// DataSource using JRBeanCollectionDataSource
private static JRDataSource getDataSource() {
    Collection<beanwithlist> coll = ...;
    return new JRBeanCollectionDataSource(coll);
}

// JavaBean
public class BeanWithList {
    private List<string> cities;
    // ...

    // Ensure a public getter for field extraction
    public List<string> getCities() {
        return this.cities;
    }
}

// jrxml file
...

// Subdataset for iterating through the list
<subdataset name="dataset1">
    <field name="city" class="java.lang.String">
        <fielddescription></fielddescription>
    </field>
</subdataset>

// Detail band with jr:list component
<detail>
    ...
    <componentelement>
        <!-- jr:list component -->
        <list ...>
            <datasetrun subdataset="dataset1">
                <!-- DataSource expression using JRBeanCollectionDataSource -->
                <datasourceexpression></datasourceexpression>
            </datasetrun>
            <listcontents ...>
                <textfield ...>
                    <textfieldexpression></textfieldexpression>
                </textfield>
            </listcontents>
        </list>
    </componentelement>
    ...
</detail>
...</string></string></beanwithlist>

Results

This configuration generates a report displaying the list's data within the Detail band.

Additional Information

• Other relevant questions address this topic:

  • "How do I print a list of strings contained within another list in iReport?"
  • "Passing the List of primitive type objects as datasource for subreport"

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