unable to run log code

**javaking** · April 2nd, 2010, 02:53 AM

while trying to run the log code it is showing org.apache.log4j.PropertyConfigurator...
i am unable to trace out the error.
here i am sending the code.

package logexmaples;
 
import java.io.*;
import java.text.*;
import java.util.*;
import java.net.URL;
 
import org.apache.log4j.*;
//import org.apache.log4j.properties;
import org.apache.log4j.PropertyConfigurator.*;
 
@SuppressWarnings("unused")
public class SimpleLog2
{
     private static String logFile = "/msglog.txt";
     private final static DateFormat df = new SimpleDateFormat ("yyyy.MM.dd  hh:mm:ss ");
     private SimpleLog2()
        {
 
        }
     public static void setLogFilename(String filename)
        {
            logFile = filename;
            new File(filename).delete();
            try
              {
                   write("LOG file : " + filename);
              }
            catch (Exception e)
              { 
                   System.out.println(stack2string(e));
              }
        }
     public static void write(String msg)
        {
           write(logFile, msg);
        }
    public static void write(Exception e)
        {
           write(logFile, stack2string(e));
        }
   public static void write(String file, String msg)
        {
           try
             {
                 Date now = new Date();
                 String currentTime = SimpleLog2.df.format(now); 
                 FileWriter aWriter = new FileWriter(file, true);
                 aWriter.write(currentTime + " " + msg+ System.getProperty("line.separator"));
                 System.out.println(currentTime + " " + msg);
                 aWriter.flush();
                 aWriter.close();
              }
            catch (Exception e)
              {
                 System.out.println(stack2string(e));
              }
         }
    private static String stack2string(Exception e)
         {
            try 
              {
                 StringWriter sw = new StringWriter();
                 PrintWriter pw = new PrintWriter(sw);
                 e.printStackTrace(pw);
                 return "------\r\n" + sw.toString() + "------\r\n";
              }
            catch(Exception e2)
              {
                 return "bad stack2string";
              }
          }
}

---------any help

**vkumar23** · April 3rd, 2010, 01:02 PM

can u post the exact errors and also highlight the line where error occurs

**javaking** · April 6th, 2010, 01:48 AM

i am getting this error.....plz check it and reply me

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet.init() for servlet LoggerServlet threw exception
org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:151)
org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:874)
org.apache.coyote.http11.Http11BaseProtocol$Http11 ConnectionHandler.processConnection(Http11BaseProt ocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.process Socket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThr ead.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:689)
java.lang.Thread.run(Unknown Source)

root cause

java.lang.NoClassDefFoundError: org/apache/log4j/PropertyConfigurator
logexmaples.LoggerServlet.init(LoggerServlet.java: 22)
javax.servlet.GenericServlet.init(GenericServlet.j ava:212)
org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:151)
org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:874)
org.apache.coyote.http11.Http11BaseProtocol$Http11 ConnectionHandler.processConnection(Http11BaseProt ocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.process Socket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThr ead.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:689)
java.lang.Thread.run(Unknown Source)

root cause

java.lang.ClassNotFoundException: org.apache.log4j.PropertyConfigurator
org.apache.catalina.loader.WebappClassLoader.loadC lass(WebappClassLoader.java:1362)
org.apache.catalina.loader.WebappClassLoader.loadC lass(WebappClassLoader.java:1208)
logexmaples.LoggerServlet.init(LoggerServlet.java: 22)
javax.servlet.GenericServlet.init(GenericServlet.j ava:212)
org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:151)
org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:874)
org.apache.coyote.http11.Http11BaseProtocol$Http11 ConnectionHandler.processConnection(Http11BaseProt ocol.java:665)
org.apache.tomcat.util.net.PoolTcpEndpoint.process Socket(PoolTcpEndpoint.java:528)
org.apache.tomcat.util.net.LeaderFollowerWorkerThr ead.runIt(LeaderFollowerWorkerThread.java:81)
org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:689)
java.lang.Thread.run(Unknown Source)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.25 logs.

**vkumar23** · April 6th, 2010, 01:52 AM

this is because your log4j jar is not available on the class path. Please ensure its in your tomcats lib folder

**javaking** · April 6th, 2010, 03:06 AM

thank u kumar...its wrkng fine....
can u help in another doubt...

**vkumar23** · April 6th, 2010, 03:33 AM

yeah go ahead and ask the question mate

vinod

**javaking** · April 6th, 2010, 04:59 AM

i am not aware of logs....but i was kept into new project which should contain logs.
i'll describe about my project which is done on jsp,servlets,core java,html....
its a web application contains 2 modules...
1) Admin ---- can login and view what are the modifications done by the user i.e login,registration,update and
logout timinings
2) User ----- can login and do registration and can do dml,ddl operations.

my query is log file should be created and it should contain whatever user do i.e login,logout,ddl and dml
operations .

i tried some examples regarding logs and log4j....but i am unable to get the answer for my project i.e where to write log file and how to call that log file in coding part i.e in servlet code...

can u help me out... reg. this i tried so much .......

**vkumar23** · April 6th, 2010, 05:53 AM

hi

have attached two files which shows how to use it

logUnit.java - this class is the master class that needs to be called in all your programs
to use the logger

it has two methods info and err which is used to sysout messages/ errors respectively

admin.java - shows you how to call the logUnit class

this should hopefully help

thanks
vinod

**javaking** · April 6th, 2010, 06:03 AM

thanx i'll try it...thanx a lot...bye

**javaking** · April 6th, 2010, 11:46 PM

hi,
gud mrng....i tried to run the program on the server but it is showing the output of another program which is previously runned...may i knw whts the prob.

**javaking** · April 6th, 2010, 11:49 PM

i m running SimpleLog2 on server it is going to other program which is lastly runned on the server....may i know why it is showing like that.

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