Struts 2 + Log4j Integration

This example demonstrates how to integrate log4j to your struts 2 project.

• Add log4j.jar file in your project lib folder
• Create log4j.xml file with loggers and appenders. Here I have added file and console appenders. Each log message will be printed in console and a file. Make sure that log4j.xml file is in the classpath.
• Import org.apache.log4j.Logger in your action class and start using the logger methods. In this example I have used logger.info method.

Lets look at the example code.

1. Action Class

package javabeat.net.struts2;

import org.apache.log4j.Logger;

public class Struts2HelloWorldAction {
	private static final Logger logger = Logger.getLogger(Struts2HelloWorldAction.class);

	public String execute(){
		logger.info("Executing method");
		return "success";
	}
}

2. Log4j XML Configuration Example – log4j.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">
	<appender name="fileAppenderInfo" class="org.apache.log4j.RollingFileAppender">
		<param name="File" value="D:/info.log" />
		<param name="MaxBackupIndex" value="10"/>
		<param name="MaxFileSize" value="5120KB"/>
		<layout class="org.apache.log4j.PatternLayout">
			<param name="ConversionPattern" value="%d
                %-5p  [%c{1}][%x] %m %n" />
		</layout>
		<filter class="org.apache.log4j.varia.LevelRangeFilter">
			<param name="LevelMin" value="INFO" />
			<param name="LevelMax" value="INFO" />
		</filter>
	</appender>
	<appender name="consoleAppenderInfo" class="org.apache.log4j.ConsoleAppender">
		<layout class="org.apache.log4j.PatternLayout">
			<param name="ConversionPattern" value="%d
                %-5p  [%c{1}][%x] %m %n" />
		</layout>
		<filter class="org.apache.log4j.varia.LevelRangeFilter">
			<param name="LevelMin" value="INFO" />
			<param name="LevelMax" value="INFO" />
		</filter>
	</appender>
	<logger name="javabeat.net.struts2">
		<level value="INFO" />
		<appender-ref ref="fileAppenderInfo" />
		<appender-ref ref="consoleAppenderInfo" />
	</logger>
	<logger name="com.opensymphony.xwork2">
		<level value="INFO" />
		<appender-ref ref="fileAppenderInfo" />
		<appender-ref ref="consoleAppenderInfo" />
	</logger>
	<logger name="org.apache.struts2">
		<level value="INFO" />
		<appender-ref ref="fileAppenderInfo" />
		<appender-ref ref="consoleAppenderInfo" />
	</logger>

</log4j:configuration>

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="struts2demo" extends="struts-default">
		<action name="log4jdemo" class="javabeat.net.struts2.Struts2HelloWorldAction"
			method="execute">
			<result name="success">/</result>
		</action>
	</package>
</struts>

4. Log Messages

2013-12-16 15:11:59,266                 INFO   [XmlConfigurationProvider][] Parsing configuration file [struts-default.xml]
2013-12-16 15:11:59,341                 INFO   [XmlConfigurationProvider][] Unable to locate configuration files of the name struts-plugin.xml, skipping
2013-12-16 15:11:59,342                 INFO   [XmlConfigurationProvider][] Parsing configuration file [struts-plugin.xml]
2013-12-16 15:11:59,346                 INFO   [XmlConfigurationProvider][] Parsing configuration file [struts.xml]
2013-12-16 15:11:59,348                 INFO   [DefaultConfiguration][] Overriding property struts.i18n.reload - old value: false new value: true
2013-12-16 15:11:59,349                 INFO   [DefaultConfiguration][] Overriding property struts.configuration.xml.reload - old value: false new value: true
2013-12-16 15:09:52,345                 INFO   [Struts2HelloWorldAction][] Executing method