populate items using struts2

[unnii <ju...@gmail.com>]

Hi all,

am new to struts2.. am struggling to get the result for populating items
from DB.

my requirement is to populate country, which is stored in DB, using struts2
and when u choose a particular country, another select box populate its
cities, which also stored in DB..

at first i tried, fetching the list from java class instead of DB... since
there is an example available in 
struts2-showcase-2.0.14,built in project of struts2.

when i imported struts2-showcase-2.0.14 and tried that program the
<s:select> is working.. so i thought to implement that into my project.. but
unfortunately it is not working.. 

i will post here and please have a look and try providing the reason :)

I paste here the example block of a program from struts2-showcase-2.0.14 :

Portion of Jsp file contains the list Like : example.jsp

<s:form action="exampleSubmit" > 
    <s:select
            tooltip="Choose Your Favourite Language"
            label="Favourite Language"
            list="favouriteLanguages"
            name="favouriteLanguage"
            listKey="key"
            listValue="description"
            emptyOption="true"
            headerKey="None"
            headerValue="None"/>


portion of java class file contains like the following: UITagExample.java

package com.mobitail.action; // i pasted this since i mentioned this in
struts.xml - u should not confuse :)

 public String execute() throws Exception {
        return SUCCESS;
    }

//constructor
public UITagExample() {
        favouriteLanguages.add(new Language("EnglishKey", "English
Language"));
        favouriteLanguages.add(new Language("FrenchKey", "French
Language"));
        favouriteLanguages.add(new Language("SpanishKey", "Spanish
Language"));
}

public List getFavouriteLanguages() {
        return favouriteLanguages;
    }


    public void setFavouriteLanguage(String favouriteLanguage) {
        this.favouriteLanguage = favouriteLanguage;
    }

    public String getFavouriteLanguage() {
        return favouriteLanguage;
    }

// === inner class
    public static class Language {
        String description;
        String key;

        public Language(String key, String description) {
            this.key = key;
            this.description = description;
        }

        public String getKey() {
            return key;
        }
        public String getDescription() {
            return description;
        }

    }

portion of struts.xml

<action name="exampleSubmit" class="com.mobitail.action.UITagExample" >
        	<result>example.jsp</result>
        	<result name="input">example.jsp</result>
        </action>


when i execute http://localhost:8080/mobitail.com/example.jsp .. result is a
blank page  

if example.jsp contains other tags like <s:textfield> with <s:select> ,
result is only a textfield .. select box is not shown...

and in the Eclipse Ganymede output window, the error is like the following:

SEVERE: Servlet.service() for servlet jsp threw exception
tag 'select', field 'list', name 'favouriteLanguage': The requested list key
'favouriteLanguages' could not be resolved as a
collection/array/map/enumeration/iterator type. Example: people or
people.{name} - [unknown location]
	at org.apache.struts2.components.Component.fieldError(Component.java:231)
	at org.apache.struts2.components.Component.findValue(Component.java:293)
	at
org.apache.struts2.components.ListUIBean.evaluateExtraParams(ListUIBean.java:79)
	at org.apache.struts2.components.Select.evaluateExtraParams(Select.java:99)
	at org.apache.struts2.components.UIBean.evaluateParams(UIBean.java:780)
	at org.apache.struts2.components.UIBean.end(UIBean.java:481)
	at
org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:43)
	at
org.apache.jsp.example_jsp._jspx_meth_s_005fselect_005f0(example_jsp.java:383)
	at
org.apache.jsp.example_jsp._jspx_meth_s_005fform_005f0(example_jsp.java:244)
	at org.apache.jsp.example_jsp._jspService(example_jsp.java:111)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:416)
	at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)



I explained every single point detail in manner... i hope u guys can help me
by seeing this.. 


Please don't tell me to try the following: i tried and its working :)
<s:select
            tooltip="Choose Your Favourite Color"
            label="Favorite Color"
            list="{'Red', 'Blue', 'Green'}"
            name="favouriteColor"
            emptyOption="true"
            headerKey="None"
            headerValue="None"/>

i need to populate from DB or from java class, like i explained at top 


Thanks in advance... 

I hope this post helps u lot... 

Cheers!!!
Unnii
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