Piotr Piotr - 1 year ago 116
Java Question

How to get the value of complex JavaBean

I have a .jrxml file and I would like to pass some params from the code to it. I have an

r class that has fields like
double price
int quantity
Product product
. The situation is simple, when i need to pass price or quantity, I just do something like this:

<textFieldExpression class = "java.lang.Integer">

The problem appears when I try to pass
. I tried something like:

<textFieldExpression class = "java.lang.String">

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

Do you have any idea how to solve this problem?

Answer Source

For example you have a pair of JavaBeans (POJO):

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 report's datasource in the manner 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")))

In case using this fields declaration:

<field name="order" class="java.lang.Object">
<field name="price" class="java.lang.Double"/>
<field name="quantity" class="java.lang.Integer"/>
<field name="productName" class="java.lang.String">

you can use such expressions:

    <reportElement x="0" y="0" width="100" height="30"/>
    <reportElement x="100" y="0" width="100" height="30"/>
    <reportElement x="200" y="0" width="100" height="30"/>


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