Write in logs files

Question

hello
I want to use my simple log system in my web application
"No log4j"
public class AppLoger
     public static void writeMessage(String msg)
          try {
               String _date = (new Date()).toString();
                         String pP = session.getServletContext().getRealPath("/");
                        String path = pP+java.io.File.separator+"logFiles"+java.io.File.separator;
              String _fName = path+"logs.txt";
             BufferedWriter out = new BufferedWriter(new FileWriter(_fName , true));
             out.write("["+_date+"]  "+msg+"\n");
             out.flush();
             out.close();
         } catch (IOException e) {
              e.printStackTrace();
in other classes
try
}catch{
            AppLoger.writeMessage("here is my message]");
local on my home pc it works fine
and the logs written in logs.txt
but ahter hostion logs can not be written in log.txt
the file logs.txt is empty  " after hostion"
what shoud be the problem regards

Answer 1

so to use log4j in web application I did folowing
1. I have put  log4j-1.2.8.jar in WEB-INF/lib
2. in WEB-INF/classes I put log4j.properties
        #set the level of the root logger to DEBUG and set its appender as X
        log4j.rootLogger = DEBUG,X
        #set the appender named X to be a console appender
        log4j.appender.X=org.apache.log4j.ConsoleAppender
        #set the layout for the appender X
         log4j.appender.X.layout=org.apache.log4j.PatternLayout
         log4j.appender.X.layout.conversionPattern=%m%n
         #define the appender named
        FILE log4j.appender.FILE=org.apache.log4j.FileAppender
       log4j.appender.FILE.File=${user.home}/myLogs
3. I have create myLogs as txt file 
now
1. is this configuration ok ?
2. how to write messges in myLog
    try{
    }catch()
       // your help
    }regards