JSON Data not displayed in JSP

Question

I have been trying to display my JSON data returned from action class in my JSP, but in vain...

I am using struts 2.1.8..

The following is the struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

<constant name="struts.enable.DynamicMethodInvocation" value="false"></constant>
<constant name="struts.devMode" value="false" />
<constant name="struts.custom.i18n.resources" value="ApplicationResources">      </constant>

<package name="sampleStrutapp" extends="struts-default">

    <action name="login" class="struts2.LoginAction">
       <result name="success">/checkValidation.jsp</result>
       <result name="error">/HelloWorld.jsp</result>
    </action>

</package>

<package name="struts2" extends="json-default">

  <action name="populate" class="struts2.Populating">
    <result type="json">
     <param name="root">popdata</param>
     <param name="noCache">true</param>
    </result>

  </action>


</package>

  </struts>

My action class is the following..

 package struts2;



import java.util.List;



 import com.opensymphony.xwork2.*;

 import net.sf.json.JSONObject;

 import org.apache.catalina.connector.Request;

 import data.Details;

 import com.Various_functions;
  public class Populating extends ActionSupport {



/**
 * 
 */
private static final long serialVersionUID = 1L;

public String usrname;
public String email;
public String lang;
public String gender;
public String comp;
public String desg;
public int rownum;
public int row;
public int getRow() {
    return row;
}

public void setRow(int row) {
    this.row = row;
}
private String popdata;

public String getPopdata() {
    return popdata;
}

public void setPopdata(String popdata) {
    this.popdata = popdata;
}

public int getRownum() {
    return rownum;
}

public void setRownum(int rownum) {
    this.rownum = rownum;
}

public String execute(){


Various_functions funct = new Various_functions();

List<Details> dev = funct.populate(this.getRow());



this.popdata = dev.get(0).getCompName()+","+dev.get(0).getDesig()+","+dev.get(0).getEmailId()+","+dev.get(0).getGender()+","+dev.get(0).getLang()+","+dev.get(0).getUserName();



System.out.println("In action class");
return "success";
}

public String getUsrname() {
    return usrname;
}
public void setUsrname(String usrname) {
    this.usrname = usrname;
}
public String getEmail() {
    return email;
}
public void setEmail(String email) {
    this.email = email;
}
public String getLang() {
    return lang;
}
public void setLang(String lang) {
    this.lang = lang;
}
public String getGender() {
    return gender;
}
public void setGender(String gender) {
    this.gender = gender;
}
public String getComp() {
    return comp;
}
public void setComp(String comp) {
    this.comp = comp;
}
public String getDesg() {
    return desg;
}
public void setDesg(String desg) {
    this.desg = desg;
}



 }

and my javascript is the following..

 function populate(rownum){

alert(rownum);

var inputData = { "row" : 1
};
//  alert(inp);
$.post('populate.action', inputData, populatecallback, "json");



}


function populatecallback(popdata) {


alert("in call back!!");
var result = popdata.split(",");

 usrname= result[5];
 email= result[2];
 desg= result[1];
 lang= result[4];
 comp= result[0];
 gender= result[3];

 $('#txtName').val(usrname);
 $('#txtEmail').val(email);
 $('#txtCmp').val(comp);
 $('#txtDesg').val(desg);
 $('#lan').val(lang);
 $('#gen').val(gender);




}

Now, the jquery post is not working.

The following is the current library structure..

commons-collections-3.1.jar, commons-fileupload-1.2.1.jar, commons-io-1.3.2.jar, commons-logging-1.1.1.jar, freemarker-2.3.15.jar, slf4j-api-1.5.8.jar, slf4j-simple-1.5.8.jar, struts2-core-2.1.8.1.jar, struts2-jquery-plugin-1.8.3.jar, xwork-core-2.1.6.jar

My js files are the following..

jquery-1.6.4.min.js, json.js

Suggestions appreciated.

Thanks and regards, hemanth.

Answer 1

The exception is caused by a library version mismatch; in your case you're deploying multiple versions of XW, which is even worse. S2.1.8.1 requires xwork-core 2.1.6. Having both on the path is a bad idea. Consider using Maven to handle your dependency management, and avoid these kinds of headaches.

I did not verify the remaining versions on your list; you need to do so. The easiest way is to use Maven, or check against something like mvnrepository.com (where I got the S2.1.8.1 XW dependency from).

Answer 2

Might not be relevant now, but back in 2009, there was an issue with Struts and writing json, namely:

http://code.google.com/p/jsonplugin/issues/detail?id=91

Perhaps its a similar issue you are hitting.