Log into separate files according to package

log4j.properties

#log4j.rootLogger=debug, stdout, dave, daveutil

log4j.logger.dave=DEBUG, dave  
log4j.logger.daveutil=DEBUG, daveutil   

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.dave=org.apache.log4j.RollingFileAppender
# do not send to other logs
log4j.additivity.dave=false
log4j.appender.dave.File=dave.log

log4j.appender.dave.MaxFileSize=10KB
# Keep one backup file
log4j.appender.dave.MaxBackupIndex=5

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


log4j.appender.daveutil=org.apache.log4j.RollingFileAppender
# do not send to other logs
log4j.additivity.daveutil=false
log4j.appender.daveutil.File=daveutil.log

log4j.appender.daveutil.MaxFileSize=10KB
# Keep one backup file
log4j.appender.daveutil.MaxBackupIndex=5

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

configure log4j in application lifecycle listener

package start;


import java.net.URL;

import org.apache.log4j.PropertyConfigurator;
import org.apache.log4j.helpers.Loader;

import weblogic.application.ApplicationLifecycleEvent;
import weblogic.application.ApplicationLifecycleListener;

public class DaveStart extends ApplicationLifecycleListener {
    
    
    public void preStart(ApplicationLifecycleEvent event){
        
        System.out.println("DaveStart preStart");
    }
    
    public void postStart(ApplicationLifecycleEvent event){
        
        System.out.println("DaveStart postStart");
        
        // configure log4j
        URL url = Loader.getResource("log4j.properties");
        PropertyConfigurator.configure(url);
        
        System.out.println("DaveStart log4j initialized");
        
    }
    

}

using defined logger

package daveutil;

import org.apache.log4j.Logger;

public class TestDave {

    static Logger logger = Logger.getLogger(TestDave.class.getName());

    public String hello(String name) {

        System.out.println("TestDave: START ");
        logger.info("TestDave: START ");

        System.out.println("Hello from TestDave to " + name);
        logger.info("Hello from TestDave to " + name);

        System.out.println("Using fast-swap");
        logger.info("Using fast-swap");

        return name;
    }

}

created logs

[dave@dave base_domain]$ ls -lt
total 84
-rw-r-----.  1 dave vesedan  1112 Dec 25 15:37 dave.log
-rw-r-----.  1 dave vesedan  4888 Dec 25 15:37 daveutil.log
-rw-r-----.  1 dave vesedan 10830 Dec 25 15:37 dave.log.1

dave.log

[dave@dave base_domain]$ more dave.log
INFO [ACTIVE] ExecuteThread: '19' for queue: 'weblogic.kernel.Default (self-tuning)' dave.TestSesssionEJB - timeFromBegin2 timeToLive180000
0

daveutil.log

[dave@dave base_domain]$ more daveutil.log 
INFO [ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)' daveutil.TestDave - TestDave: START 
INFO [ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)' daveutil.TestDave - Hello from TestDave to dave
INFO [ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)' daveutil.TestDave - Using fast-swap
INFO [ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)' daveutil.TestDave - TestDave: START 
INFO [ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)' daveutil.TestDave - Hello from TestDave to dave
INFO [ACTIVE] ExecuteThread: '20' for queue: 'weblogic.kernel.Default (self-tuning)' daveutil.TestDave - Using fast-swap