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Struts 2 Debug Tag Example

Posted by Mohaideen Jamil in Struts 2 Tutorial

In Struts 2, the “debug” tag is used to output the content of the “Value Stack” and Stack Context details in the web page.

** UPDATE: Struts 2 Complete tutorial now available here.

1. Jsp debug tag example

A JSP page to output the system’s “Value Stack” and “Stack Context” using debug tag.

debug.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<title>Debug tag</title>
</head>
<body>
<h3>Debug tag</h3>
<s:debug />
</body>
</html>

2. Action class

A Action class, with a field named actionProperty” property, show in value stack in jsp.

DebugTag.java

package com.simplecode.action;
import com.opensymphony.xwork2.Action;

public class DebugTag implements Action
{
	public String actionProperty;

	public String getActionProperty()
        {
		return actionProperty;
	}

	public void setActionProperty(String actionProperty)
        {
		this.actionProperty = actionProperty;
	}
}

3. 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.devMode" value="true" />
<package name="default" extends="struts-default">
	<action name="debugTagAction" class="com.simplecode.action.DebugTag">
		<result name="success">/debug.jsp</result>
	</action>
</package>
</struts>

4. Demo

http://localhost:8089/Debug/debugTagAction.action

Output

The <s:debug /> will generate a text link named “debug“, On clicking this link, it expands to show the debugging details.

struts debug tag