Struts 2 OGNL . Not able to retrieve data using %{} syntax

Question

I have developed a simple Struts 2 project.but when I am trying to retrieve the data from valuestack I am not getting any data. Basically %{} syntax is not recognized while the page is getting served.

My Index.jsp

    <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form method="get" action="justwork.action">
<input type="text" name="name" value="Xarvis">
<input type="submit" >
</form>
</body>
</html>

My struts.xml

    <?xml version="1.0" encoding="UTF-8"?>
       <!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
    "http://struts.apache.org/dtds/struts-2.5.dtd"> 
<package name="TestFramework" extends="struts-default" >
<action name="justwork" class="org.pranab.actions.OGNLTest">
<result name="success">/success.jsp</result>
</action>
</package>
</struts>

my OGNLTest.java

 package org.pranab.actions;
 import com.opensymphony.xwork2.ActionContext;
 public class OGNLTest {

    private String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String execute(){
     return "success";
        }}

finally my success.jsp

  <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
       <h2>SUCCESS</h2>

         <s:property default="%{name}" value="name"/>
         <br>
%{name}
</body>
</html>

Output on Submit:

Output

Is there a requirement of a switch in strust.xml or properties to enable the %{} syntax??

score 0 · Answer 1 · edited Jun 20 '20 at 09:12

0

You're making confusion:

%{} is OGNL's expression evaluation operator.
What you want outside of the tag is ${}, which is JSP EL
JSP EL is not escaped and is very basic when compared to Struts2 tags or JSTL tags. Avoid using it.

EDIT

default attribute is of type String, not Object like value, hence it won't be evaluated.

Put a static String in it.

edited Jun 20 '20 at 09:12

Community

1
1

answered Nov 14 '16 at 14:29

Andrea Ligios

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Thank Andrea for input. But when I am using %{} inside the struts 2 tags then also it's not working. – Pranab Bharadwaj Nov 14 '16 at 14:41
Yes that's the value .... but suppose I provided the value attribute with another property that doesn't exist in ValueStack. like . Then as value doesn't exist in value stack then my default attribute should take over . But then also the output from the tag is : %{name} – Pranab Bharadwaj Nov 15 '16 at 02:20
yes,default attribute is of strig type, hence I am using OGNL EL expression to force retrival of value from valuestack so that my default attribute will store a dynamic value instead of static one. That's the whole point of using EL against the default attribute – Pranab Bharadwaj Nov 29 '16 at 02:20

Struts 2 OGNL . Not able to retrieve data using %{} syntax

1 Answers1

EDIT