java - Report design not valid. Field not found Jasper Reports -

im trying create basic jasper report jrbeancollectiondatasource. in there im having list of objects inside javabean.

public class course {      private int id;     private list<student> students; } 

student object looks like

public class student {      private string name;     private int id; } 

i want print student information inside report. how jrxml looks like

 <subdataset name="dataset1" uuid="09015d96-ad5a-4fed-aa9e-19d25e02e205">  <field name="students" class="java.util.list">   <fielddescription><![cdata[students]]></fielddescription>  </field> </subdataset>  <field name="id" class="java.lang.integer"/> <field name="students" class="java.util.list"/> <field name="name" class="java.lang.string"/>  <componentelement>                 <reportelement x="200" y="0" width="400" height="20"/>                 <jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemalocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printorder="vertical">                     <datasetrun subdataset="dataset1">                         <datasourceexpression><![cdata[new net.sf.jasperreports.engine.data.jrbeancollectiondatasource($f{students})]]></datasourceexpression>                     </datasetrun>                     <jr:listcontents height="20" width="400">                         <textfield>                             <reportelement x="0" y="0" width="100" height="20"/>                             <box leftpadding="10">                                 <toppen linewidth="1.0"/>                                 <leftpen linewidth="1.0"/>                                 <bottompen linewidth="1.0"/>                                 <rightpen linewidth="1.0"/>                             </box>                             <textelement/>                             <textfieldexpression><![cdata[$f{name}]]></textfieldexpression>                         </textfield>                      </jr:listcontents>                 </jr:list>             </componentelement> 

but when run im getting

net.sf.jasperreports.engine.design.jrvalidationexception: report design not valid :       1. field not found : name report design not valid :       1. field not found : name 

im beginner jasper reports can please tell me doing wrong here.

you have define fields before using it.

in jrxml, have 3 field defined students in subdataset, id , students. haven't defined name , using in jrxml , that's why getting exception.

try defining name, like

<field name="name" class="java.lang.string"/>