Log4j Configuration Issue

[Saket Kumar Sinha]

I am trying to configure logger just for learning log4j.

I have log4j xml file like this

<?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="FILE.TRACE" class="org.apache.log4j.FileAppender">
		<param name="File" value="C:/logs/DemoLog4j/CUTrace.log"/>
		<layout class="org.apache.log4j.PatternLayout">
			<param name="ConversionPattern" value="%d{yyyy.MM.dd HH:mm:ss.SSS.z} %m%n" />
		</layout>
	</appender>
	<appender name="FILE.ALERT" class="org.apache.log4j.FileAppender">
		<param name="File" value="C:/logs/DemoLog4j/alerts.log"/>
		<layout class="org.apache.log4j.PatternLayout">
			<param name="ConversionPattern" value="%d{yyyy.MM.dd HH:mm:ss.SSS.z} %m%n" />
		</layout>
	</appender>
	<category name="ALERT" additivity="false">
		<level value="fatal" /> 
		<appender-ref ref="FILE.ALERT"/>
	</category>
	<category name="TRACE" additivity="false">
	   <level value="fatal" /> 
	   <appender-ref ref="FILE.TRACE"/>
	</category>
	<root>
		<level value="fatal" /> 
	</root>
</log4j:configuration>

In the java code i am fetching this category

package com.infy;


import org.apache.log4j.Logger;
import org.apache.log4j.xml.DOMConfigurator;
public class MyLogger {

	private static MyLogger objLogger = null;

	private Logger objTraceLogger=null;
	
	private Logger objAlertLogger=null;
	
	private MyLogger(){
		
		DOMConfigurator.configure("log4jconfig.xml");
		objTraceLogger=Logger.getLogger("TRACE");
		objAlertLogger=Logger.getLogger("ALERT");
	}
	
	public static MyLogger getLogger() {

		if (objLogger == null) {
			objLogger = new MyLogger();
		}

		return objLogger;
	}
	
	public void traceMessage(String strClassName, String strMethodName,
			String strMsg) {
		
			System.out.println(objTraceLogger.isInfoEnabled());
			StringBuffer sbMessage = new StringBuffer();
			sbMessage.append(" Thread- ");
			sbMessage.append(Thread.currentThread().getName());
			sbMessage.append(" ");
			sbMessage.append("COMMUTIL  ");
			sbMessage.append("INFO :");
			sbMessage.append(strClassName);
			sbMessage.append(" ");
			sbMessage.append(strMethodName);
			sbMessage.append(" ");
			sbMessage.append(strMsg);

			objTraceLogger.warn(sbMessage);
			
			
	}
	
	public void traceDebugMessage(String strClassName, String strMethodName,
			String strMsg) {
		
		    System.out.println(objAlertLogger.isInfoEnabled());
			StringBuffer sbMessage = new StringBuffer();
			sbMessage.append(" Thread- ");
			sbMessage.append(Thread.currentThread().getName());
			sbMessage.append(" ");
			sbMessage.append("COMMUTIL");
			sbMessage.append(" ");
			sbMessage.append(strClassName);
			sbMessage.append(" ");
			sbMessage.append(strMethodName);
			sbMessage.append(" ");
			sbMessage.append(strMsg);

			objAlertLogger.debug(sbMessage.toString());
		

	}


}

I have the main class which is calling the traceMessage and TraceDebugMessage as follows

package com.infy;

import org.apache.log4j.xml.DOMConfigurator;

public class Test {

	
	
	public static void main(String args[]){
		
	
		
		MyLogger.getLogger().traceDebugMessage("Test", "Main", "My First Debug Message");
		MyLogger.getLogger().traceMessage("Test", "Main", "My First Message");
		
		
	}
}

My problem is
i have mentioned the category priorty as fatal in log4j xml.
and in the MyLogger class i am trying to print debug and warn like this.

objTraceLogger.warn(sbMessage);
objAlertLogger.debug(sbMessage.toString());

It should not have allowed as priority has been set for fatal only. But in the log file i am able to see the logs whenerver i am runnig the application.
What am i doing wrong here ?
Need Help!!

[Tony Docherty]

I've never used xml config files with Log4J I've always used properties files, but I had a quick look at the Log4jXmlFormat wiki and I can't see an element called category but there is one called logger which appears to have the same structure as your category elements. Are you sure the element is called category?

[Saket Kumar Sinha]

Thanks tony for the reply

The above xml configuration is fine. we can use catalog to add multiple appenders as required.

The above code is working i saw some other logs and thought it's not working properly. wasted my time and effort.

Sorry !!

[Tony Docherty]

No problem.
To be honest I hadn't realised you could even use XML config files with Log4J and they look more readable than the property files I've been using so it has given me something to look into further.