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How to get the value of a complex JavaBean

I have a .jrxml file and I would like to pass some parameters from the code to it. I have an Orde r class that has fields such as double price , int quantity and Product product . The situation is simple when I need to pass a price or quantity, I just do something like this:

 <textFieldExpression class = "java.lang.Integer"> <![CDATA[$F{quantity}]]> </textFieldExpression>

The problem occurs when I try to pass product.getName() . I tried something like:

 <textFieldExpression class = "java.lang.String"> <![CDATA[$F{product}.getName()]]> </textFieldExpression>

and many others, but I keep getting the error: net.sf.jasperreports.engine.design.JRValidationException: Report design not valid : 1. Field not found : product

Do you have any ideas how to solve this problem?

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For example, you have a couple of JavaBeans (POJOs):

 public class Order { private double price; private int quantity; private Product product; // public getters } public class Product { private String name; // public getters }

and you declare the report data source like this: (yes, I like Guava)

 JRBeanCollectionDataSource datasource = new JRBeanCollectionDataSource(Lists.newArrayList(ImmutableList.<Order>builder() .add(new Order(1000.2, 10, new Product("Phone"))) .add(new Order(10200.0, 2, new Product("Tv"))) .build()));

If you use this field declaration:

 <field name="order" class="java.lang.Object"> <fieldDescription><![CDATA[_THIS]]></fieldDescription> </field> <field name="price" class="java.lang.Double"/> <field name="quantity" class="java.lang.Integer"/> <field name="productName" class="java.lang.String"> <fieldDescription><![CDATA[product.name]]></fieldDescription> </field>

you can use these expressions:

 <textField> <reportElement x="0" y="0" width="100" height="30"/> <textFieldExpression><![CDATA[$F{price}]]></textFieldExpression> </textField> <textField> <reportElement x="100" y="0" width="100" height="30"/> <textFieldExpression><![CDATA[$F{quantity}]]></textFieldExpression> </textField> <textField> <reportElement x="200" y="0" width="100" height="30"/> <textFieldExpression><![CDATA[$F{productName}]]></textFieldExpression> </textField>

Note:

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