I've got a problem relating to the validation of indexed properties in Struts
1.1
I get the following error message when I try to access an ArrayList of
students in my DynaValidatorForm
root cause
java.lang.IndexOutOfBoundsException: Index: 1, Size: 0
java.util.ArrayList.RangeCheck(Unknown Source)
java.util.ArrayList.get(Unknown Source)
org.apache.struts.action.DynaActionForm.get(DynaActionForm.java:298)
Here is some background to the problem...
In my session I have an ArrayList called studentsList of objects of type
experiment.mybeans.Student. A Student object has getter and setter methods
for id, year and gradeAverage.
In my students.jsp I create a table by iterating through my student objects
like this...
<c:forEach var="students" items="${sessionScope.group.studentsList}" >
<tr><td><html:text indexed="true" name="students" property="id"/></td>
<td><html:text indexed="true" name="students" property="year"/></td>
<td><html:text indexed="true" name="students"
property="gradeAverage"/></td></tr>
</c:forEach>
As you can see the table contains empty text boxes and I would like to
validate these have been filled in, so in struts-config.xml I create my
dynavalidatorform as follows...
<form-bean name="studentsForm"
type="org.apache.struts.validator.DynaValidatorForm" >
<form-property name="students" type="java.util.ArrayList" />
</form-bean>
And in validation.xml I place my validation rules...
<form name="studentsForm">
<field property="id" indexedListProperty="students" depends="required">
<arg0 key="error.studentid.required"/>
</field>
<field property="year" indexedListProperty="students" depends="required">
<arg0 key="error.studentyear.required"/>
</field>
<field property="gradeAverage" indexedListProperty="students"
depends="required">
<arg0 key="error.studentgrade.required"/>
</field>
</form>
Now here is where things start to go a bit pear-shaped
I have read somewhere online that I need to populate the form ArrayList
before I get to my jsp page. So I have created an action class called
PreStudentsAction.java which takes the student ArrayList out of the session
and assigns it to the student ArrayList in the form before forwarding to the
students.jsp page...
public class PreStudentsAction extends Action{
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception
{
DynaValidatorForm myForm = (DynaValidatorForm)form;
Group group = (Group)request.getSession().getAttribute("group");
ArrayList<Student> students = group.getStudentsList();
myForm.set("students", students);
return (mapping.findForward("success"));
}
}
Finally when I run my application my table is displayed but when I fill in
the table and press submit I get the IndexOutOfBounds error. It appears to
me that the student ArrayList in the form remains empty and that my Action
class was unsuccessful in populating the form's ArrayList.
Can anybody see what I'm doing wrong?
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