Dynamic fields in Struts ActionForm?

[Mallik Avula]

HI Friends
i will explain the scenario first
i have a page, in that i need to display questions and options for that question.
questions are dynamic, how many i have in database, i need to display all.
and options for a question also dynamic , means one question may have 2 options and other can have 10 options.

For this i created one Question Bean

 
 
public class QuestionBean {

long questionId;
String questionTitle;
String questionBody;

OptionBean[] options;

public OptionBean[] getOptions() {
return options;
}
public void setOptions(OptionBean[] options) {
this.options = options;
}
public long getQuestionId() {
return questionId;
}
public void setQuestionId(long questionId) {
this.questionId = questionId;
}
public String getQuestionTitle() {
return questionTitle;
}
public void setQuestionTitle(String questionTitle) {
this.questionTitle = questionTitle;
}
public String getQuestionBody() {
return questionBody;
}
public void setQuestionBody(String questionBody) {
this.questionBody = questionBody;
}

 
}
 

options Bean is

 
public class OptionBean {

long optionId;
String optionDesc;
public long getOptionId() {
return optionId;
}
public void setOptionId(long optionId) {
this.optionId = optionId;
}
public String getOptionDesc() {
return optionDesc;
}
public void setOptionDesc(String optionDesc) {
this.optionDesc = optionDesc;
}
}

in Struts-config.xml

 
<form-bean name="enrollmentForm" type="com.shespeaks.form.member.EnrollmentForm">
                       <form-property name="questions" type="com.shespeaks.form.member.QuestionBean"/>

</form-bean>

in jsp

 
<table width="100%">
<logic:iterate id="questions" name="qlist">
<html:hidden indexed="true" name="questions" property="questionId"></html:hidden>
<b><bean:write name="questions" property="questionBody"/></b><br>
<bean :mrgreen: efine  id="option" name="questions"  property="options" scope="request" type="com.shespeaks.form.member.OptionBean">
<logic:iterate id="ops" name="option">
<bean:write name="ops" property="optionDesc"/>
</logic:iterate>
</bean :mrgreen: efine>
</logic:iterate>
</table>

but it is throwing Exception

 
 
javax.servlet.ServletException: javax.servlet.jsp.JspException: Cannot find bean: "option" in any scope
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:850)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:779)
org.apache.jsp.pages.member.Enrollment_jsp._jspService(Enrollment_jsp.java:1001)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:99)
org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:82)
org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:51)
org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:48)
org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:280)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1858)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:446)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

How to say in struts-config.xml that a form-property contains another bean and how to solve this problem.
Could any body explain me please?

[Merrill Higginson]

The <form-property> element is only used if the bean type is DynaActionForm. Since you're not using DynaActionForm, this element is ignored.

I'd suggest simply defining a property in your ActionForm that is a List of QuestionBeans with corresponding getters and setters. If you plan on creating input fields for each question, you will also need an indexed getter for. Example:

private List<QuestionBean> questions;
 
public List<QuestionBean> getQuestions() { return questions; }
 
public void setQuestions(List<QuestionBean> questions) {this.questions = questions; }
 
public QuestionBean getQuestion(int index) { return questions.get(index); }

You can then use indexed properties to access each question. For more information on how to use indexed properties, see question 7 of this forum's FAQ.