Help Please -log4j:WARN No appenders could be found for logger

[sree visu]

I am a newbie to log4j .Could you please say me on how to write the log4j.properties file.
Since i have not written this file i get a warning that log4j is not initialised properly .

I referred to previous posts in this topic but i couldn't understand
Could you please explain about how to configure the log4j.properties file.
The exact message is given below.

log4j:WARN No appenders could be found for logger (org.apache.struts.util.PropertyMessageResources).
log4j:WARN Please initialize the log4j system properly.

Here is what i did.I configured a initialization servlet as given below and configured it to load on startup.
I would like to write my logs in a file named error.log inside a WEB-INF directory.I have written it in my initialization servlet.

I Wish to get all my logs into the file mentioned below.That is (/WEB-INF/logs/error.log) when i open the file i only have the messages relating to org.apache.commmons.beanutils

here is the sample that i obtained

INFO  org.apache.commmons.beanutils httpWorkerThread-4848-1
      2009-02-01 14:16:37,921 - Startingorg.apache.commmons.beanutils
INFO  org.apache.commmons.beanutils httpWorkerThread-4848-1
      2009-02-01 14:16:37,921 - Startingorg.apache.commmons.beanutils

Also could you please say me how to use it in the java files that i write.I tried the following

Logger l=Logger.getLogger("myjavafilename");
l.info("Hai");

but this did not give a log in that particular log file

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.cff.shared;

import java.io.IOException;
import javax.servlet.http.HttpServlet;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.RollingFileAppender;

/**
 *
 * @author Sree Aurovindh
 */
public class InitLog4j extends HttpServlet {

    private static final String logPath = "/WEB-INF/logs/error.log";

    @Override
    public void init() {
        FileAppender appender = getAppender(logPath);
        if (appender == null) {
            return;
        }
        initLogger(null, appender, Level.ERROR);
        initLogger("org.apache.commmons.beanutils", appender, Level.DEBUG);
    }

    private FileAppender getAppender(String fileName) {
        RollingFileAppender appender = null;
        try {
            appender = new RollingFileAppender(
                    new PatternLayout("%-5p %c %t%n%29d - %m%n"), getServletContext().getRealPath(fileName), true);
            appender.setMaxBackupIndex(5);
            appender.setMaxFileSize("1MB");
        } catch (IOException ex) {
            System.out.println("Could not create appender for " + fileName + ":" + ex.getMessage());
        }
        return appender;
    }

    private void initLogger(String name, FileAppender appender, Level level) {
        Logger logger;
        if (name == null) {
            logger = Logger.getRootLogger();
        } else {
            logger = Logger.getLogger(name);
        }
        logger.setLevel(level);
        logger.addAppender(appender);
        logger.info("Starting" + logger.getName());
      
    }
}

Thank you for your time

[Martijn Verburg]

Usually this occurs when you do not have log4j.properties in your CLASSPATH.

[sree visu]

Yes,I am a newbie to log4j and hence it would be of great help to me if you could illustrate on how to configure it.I tried it on hard but i always get a warning message stating that Log4j was not initialised properly although the first message vanished.Further i could not write the logs in the file mentioned in my previous post.

Please help me
Thank you so much for patient reading

[Martijn Verburg]

OK, whereabouts is your log4j.properties file kept in your WAR (or expanded WAR)? It should be in the CLASSPATH for the WAR so under WEB-INF/classes might be a good start....

[sree visu]

Yes it was under web-inf/classes.But i am in doubt about what to configure to configure.I did the following

log4j.appender.stdout=org.apache.log4j.FileAppender
log4j.appender.stdout.Target=/WEB-INF/logs/error.log
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.rootLogger=debug, stdout

I got the following error messages.

log4j:WARN No such property [target] in org.apache.log4j.FileAppender.
log4j:WARN File option not set for appender [stdout].
log4j:WARN Are you using FileAppender instead of ConsoleAppender?
log4j:ERROR No output stream or file set for the appender named [stdout].

What must be done now.

Thanks for your help

[Martijn Verburg]

Should it not be log4j.appender.stdout.target instead of log4j.appender.stdout.Target?

[sree visu]

Yes i did the modifications.But still i get the same error.

Here is my log4j.properties

log4j.appender.stdout=org.apache.log4j.FileAppender  
log4j.appender.stdout.target=/WEB-INF/logs/error.log  
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout  
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n  
log4j.rootLogger=debug, stdout  

and my error messages

log4j:WARN No such property [target] in org.apache.log4j.FileAppender.
log4j:WARN File option not set for appender [stdout].
log4j:WARN Are you using FileAppender instead of ConsoleAppender?
log4j:ERROR No output stream or file set for the appender named [stdout].

Sorry for requerying again.Please help me.

[Martijn Verburg]

Sorry try File instead of target

[sree visu]

Thanks Martijn Verburg the warning and error messages vanished.But i still have one more problem.Instead of getting the logs inside my WEB-INF directory inside my server(Inside the project folder/build/web/WEB-INF/logs) ,I have got a new folder called WEB-INF created at my E:\ (E:\WEB-INF\logs) drive where my netbeans project resides.Could you please tell me what the problem is.

Thanks a lot

[Martijn Verburg]

Try a relative path instead of an absolute one (e.g. Get rid of the first '/')

[Paul Clapham]

A relative path is going to be interpreted as relative to the application server's current working directory. This isn't likely to be anything in any of the web applications running in the server.

If you want the logs to be put in a specific directory, provide the full path to that directory. Also putting the logs inside your web application isn't necessarily a good strategy, as they may disappear when you install a new version of the application in many servers.

[bharani rao]

hi,

i have the same problem..
here is my property file

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.FileAppender
log4j.appender.stdout.Target=C:\Program Files\Java\jdk1.5.0_11\bin\log\error.log
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.rootLogger=debug, stdout

and the error message

log4j:WARN No such property [target] in org.apache.log4j.FileAppender.
log4j:WARN File option not set for appender [stdout].
log4j:WARN Are you using FileAppender instead of ConsoleAppender?
log4j:ERROR No output stream or file set for the appender named [stdout].

and this is my class

import org.apache.log4j.*;
public class SimpleLogging {
    /** Creates a new instance of SimpleLogging */
    public SimpleLogging() {
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Logger logger =Logger.getLogger("loggg");
        logger.info("Hello this is an info message");
    }
}

what am i doing wrong....

i think i m doing wrong here in this line..... Logger logger =Logger.getLogger("loggg");
if not.. what is wrong

[Martijn Verburg]

ceazer bunny wrote:
### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.FileAppender
log4j.appender.stdout.Target=C:\Program Files\Java\jdk1.5.0_11\bin\log\error.log
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.rootLogger=debug, stdout

This is a little confusing to start with. I'd call your appender fileappender as opposed to stdout as stdout is traditionally to the console.

ceazer bunny wrote:
and the error message
log4j:WARN No such property [target] in org.apache.log4j.FileAppender.
log4j:WARN File option not set for appender [stdout].
log4j:WARN Are you using FileAppender instead of ConsoleAppender?
log4j:ERROR No output stream or file set for the appender named [stdout].

* As it says, you're using a property called target which is not valid, look at your capitilisation and/or what file appender actually expects as a property (hint, File not Target?)

Hope that helps!
*

[bharani rao]

hi martijn,

you certainly helped me...
now it is compiling without errors.... but i'm not getting the log in the desired file.... to be precise i did not get the log in any way. but the program is running fine without errors...

i have clarifications on these lines..

Logger logger =Logger.getLogger("log"); // in the class file.... i have log directory in the java\bin folder
log4j.appender.stdout.File=C:\Program Files\Java\jdk1.5.0_11\bin\log\error.log /// i donot have this error.log file in the path..i was thinking logger will create a file called error.log...

is it right???

what else should i do...



this is the class

import org.apache.log4j.*;
public class SimpleLogging {
    /** Creates a new instance of SimpleLogging */
    public SimpleLogging() {
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Logger logger =Logger.getLogger("log");
        logger.info("Hello this is an info message");
    }
}

this is the property file

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.FileAppender
log4j.appender.stdout.File=C:\Program Files\Java\jdk1.5.0_11\bin\log\error.log
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.rootLogger=debug, stdout

thanks in advance

[Martijn Verburg]

Try Logger logger = Logger.getLogger(SimpleLogging.class);

[bharani rao]

hi martijn,

i tried it but it is not creating any new file in the log folder.
can you just tell me where will be my log file and what will be the name of the log file for the code i have provided.

Thanks in advance

[Amit Ghorpade]

"ceazer bunny " please check your private messages for an important administrative matter. You can check them by clicking the My Private Messages link above.

[bharani rao]

hi amit,
i'm in office.
entry to that session is resstricted..
i guess it is regarding coding the codes..
i have done it

[bharani rao]

hi martijn,

i didn't get the output..

help me please

[Martijn Verburg]

ceazer bunny wrote:hi amit,
i'm in office.
entry to that session is resstricted..
i guess it is regarding coding the codes..
i have done it

It will be regarding your display name, see Naming Policy

[Martijn Verburg]

ceazer bunny wrote:hi martijn,

i tried it but it is not creating any new file in the log folder.
can you just tell me where will be my log file and what will be the name of the log file for the code i have provided.

Thanks in advance

I would expect to see the log file at:

C:\Program Files\Java\jdk1.5.0_11\bin\log\error.log

However, sometimes java apps don't really like spaces in directory names, so try changing your log path to c:\error.log and see if one appears there

[Josh Wild]

When log4j starts it displays messages like

".....setting property file to 'xxxx'"
"Adding appender 'stdout' to appender 'root'" etc

To see these messages, your log4j configuration must have been started in "debug" mode. I can see from your config file that you are already doing that.

You must look out for the destination where 'File' attribute is being set. Also figure out if you are accidentally setting the root appender programatically (after log4j has started) because setting the root appender again will mean your previous settings will have no effect.

[Josh Wild]

....setting the root appender again will mean your previous settings will have no effect.

That means if you set the root appender again in code, you will not get traces logged to desired log file anyway unless you manually add a new FileAppender instance to root.

[Leonardo Jose Gomes da Silva]

You can do your log4j config that:

log4j.rootLogger=debug, stdout, R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=/home/leonardo/dev/example.log

log4j.appender.R.MaxFileSize=100KB
# Keep one backup file
log4j.appender.R.MaxBackupIndex=1

log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n

[]'s