在J2EE应用程序中使用自定义类作为参数/字段

Question

I am trying to pass the custom object value to Jasper report, I am using compiled jasper ie .jasper file.

Passing the parameter in jrxml

<parameter name="STUDENT_ID" class="abc.xyz.Student"/>

Trying to access the parameter in jrxml

      <textField>
            <reportElement x="156" y="100" width="403" height="20" uuid="20cc6538-41d9-4fe5-ba43-e3152b073e10"/>
            <textFieldExpression><![CDATA[":    "+$P{STUDENT_ID}.getId()]]></textFieldExpression>
      </textField>

Structure:

jasper/
   temp.jasper
WEB-INF/
   classes/
   lib/
   web.xml

Service class

Student student = session.get("student")
HashMap<String, Object> map = new HashMap<String, Object>(1);
map.put("STUDENT_ID", student);
print = JasperFillManager.fillReport(ServletActionContext.getServletContext().getRealPath("/jasper/temp.jasper"), map, new JREmptyDataSource());

Student class will vary student to student, Student class has the fields id and name with getters and setters , but somehow values are not getting rendered on generated PDF file.

How to access the Student object?

Answer 1

At first view I can't see nothing wrong with your code, but if you are passing an empty data source, be sure to not place the field you want on Datails band. Without data source, this band is not rendered. Test it putting the field on Title band, for example.