Using Log4J In Netbeans

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I am trying to use Log4J in Netbeans, however I am having a very hard time understanding the tutorials. Many of them say "do this" and assume I know what they are talking about. I do not. If you would, I'd like step-by-step instructions on where to find the correct libraries for Log4J, where to put them in a project, and an example program using Log4J.

log4j 2.x

Similar to below, but the name of the filename needs to be log4j2.properties. (Also note that old examples of log4j.properties configuration don't actually seem to do anything useful in Log4j 2, so make sure to copy your initial configuration from a tutorial dedicated to Log4j 2, and not the older v1.)

Thanks @bobulous

log4j 1.x

If you get log4j:WARN No appenders could be found for logger message, then it is most likely that you haven't included the log4j.properties file in your project. Here's a screenshot of how you should include it in NetBeans.

Log4j with NetBeans IDE - Complex to Simple, I think this post will help you to configure the log4j in Netbeans IDE. First you have to create the Java Project “Log4j” Then you have to put the “log4j.properties​”  I'm working on a Maven Web application using Spring MVC 4.2.5.RELEASE, I'm using Netbeans IDE with GlassFishSErver 4.1, I want to use log4j 1.2.17 so I created a log4j.properties file but it seems like my properties file it's not being found because I get the following error:

http://www.tutorialspoint.com/log4j/log4j_sample_program.htm -

Download the jar from here: https://logging.apache.org/log4j/1.2/download.html

Add this file in your path:

log4j.properties

# Define the root logger with appender file
log = /usr/home/log4j
log4j.rootLogger = DEBUG, FILE

# Define the file appender
log4j.appender.FILE=org.apache.log4j.FileAppender

# Here is the location output of the file!
log4j.appender.FILE.File=${log}/log.out

# Define the layout for file appender
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.conversionPattern=%m%n

Then run this:

log4jExample.java

import org.apache.log4j.Logger;

import java.io.*;
import java.sql.SQLException;
import java.util.*;

public class log4jExample{
  /* Get actual class name to be printed on */
  static Logger log = Logger.getLogger(
                      log4jExample.class.getName());

  public static void main(String[] args)
                throws IOException,SQLException{

     log.debug("Hello this is an debug message");
     log.info("Hello this is an info message");
  }
}

Using Log4J In Netbeans, log4j 2.x. Similar to below, but the name of the filename needs to be log4j2.​properties . (Also note that old examples of log4j.properties configuration don't  it means in root application whre i have customized log4j.xml file.but it is not displyed after buld war of that application.after build jar,log4j.xml that is displayed is different i think it is coming from external JAR that i have externally added in my root application – amit singh Aug 22 '13 at 11:40

This very comprehensive working example for log4j2 has nearly everything, duplicated here incase the link breaks

To get a working example, create a new maven java application in netbeans (or any IDE)

New Project -> Maven -> Java Application

In your new maven project there is a pom.xml under 'project files' in netbeans, you need to add this dependency:

I tested this with log4j version 2.11.1, check for latest here

   ... 
   </properties>
   <dependencies>
       <dependency>
           <groupId>org.apache.logging.log4j</groupId>
           <artifactId>log4j-core</artifactId>
           <version>2.11.1</version>
       </dependency>
   </dependencies>
</project>

Create a src/main/resources/log4j2.properties (this exact path and name is required)

you can later customize the print layout using this as a reference

status = error
name = PropertiesConfig

filters = threshold
filter.threshold.type = ThresholdFilter
filter.threshold.level = debug

appenders = console
appender.console.type = Console
appender.console.name = STDOUT
appender.console.layout.type = PatternLayout
appender.console.layout.pattern = %d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

rootLogger.level = debug
rootLogger.appenderRefs = stdout
rootLogger.appenderRef.stdout.ref = STDOUT

Create a new class: Log4j2HelloWorldExample.java

package com.howtodoinjava.log4j2.examples;   

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;


public class Log4j2HelloWorldExample {

    private static final Logger LOGGER = LogManager.getLogger(Log4j2HelloWorldExample.class.getName());

    public static void main(String[] args) {
        LOGGER.debug("Debug Message Logged !!!");
        LOGGER.info("Info Message Logged !!!");
        LOGGER.error("Error Message Logged !!!", new NullPointerException("NullError"));
    }
}

When you run the class you will get his output:

 2016-06-16 13:41:27 DEBUG Log4j2HelloWorldExample:12 - Debug Message Logged !!!
 2016-06-16 13:41:27 INFO  Log4j2HelloWorldExample:13 - Info Message Logged !!!
 2016-06-16 13:41:27 ERROR Log4j2HelloWorldExample:14 - Error Message Logged !!!
 java.lang.NullPointerException: NullError
     at com.howtodoinjava.log4j2.examples.Log4j2HelloWorldExample.main(Log4j2HelloWorldExample.java:14)
    [classes/:?]

If the above example works stand alone, but not when you integrate it into your project there might be some dependency interference

Run mvn dependency:tree and exclude all interfering log4j dependencies, I needed to exclude these:

<exclusion>
    <!-- 
        [INFO] |  +- log4j:log4j:jar:1.2.17:compile
        [INFO] |  +- org.slf4j:slf4j-log4j12:jar:1.7.16:compile
    -->
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
</exclusion>
<exclusion>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
</exclusion>

To bridge existing slf4j code to my newly added log4j2, I had to include this dependency I found here

   <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-slf4j-impl</artifactId>
      <version>2.9.0</version>
   </dependency>

I still saw this:

log4j:WARN No appenders could be found for logger
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

I also needed to ensure the log4j2.property file had my OS specific line endings, I was using Cygwin to create property files and running netbeans from windows and it failed to find appenders due to the property file all being read as a single line by Windows

I was getting error while running one log4j in netbeans, This error usually means that it cannot find log4j.properties on your classpath. Even though you are trying to instantiate your own Configurator,  log4j.logger. <logger-name> =level[, appender1, appender2…] where <logger-name> is name of a particular logger in the source code, for example: if you define a logger called com.mycompany.DatabaseUtil, then you can configure it through log4j’s configuration file as follows: log4j.logger.com.mycompany.DatabaseUtil=INFO, ConsoleAppender

Log4j with NetBeans IDE, I think this post will help you to configure the log4j in Netbeans IDE First you have to create the Java Project "Log4j" Then you have to put the  I wrote a web service project using netbeans 6.7.1 with glassfish v2.1, put log4j.properties to the root dir of project and use: static Logger logger = Logger.getLogger(MyClass.class); in Constru

IPGRAY : how to configure log4j in netbeans, IPGRAY : how to configure log4j in netbeans. What Is Log4J In Java | How To Use Log4J In Duration: 7:52 Posted: Jun 17, 2017 Of course this only works if the default NetBeans logger is in place. Sometimes however it may make sence to provide completely different logger. This can be done by one of two JDK standard properties: java.util.logging.config.file or java.util.logging.config.class as described at LogManager's javadoc.

Log4j Messaging in NetBeans IDE, Getting the plug-in is easy, just go to the NetBeans-Lumbermill site. Then, if you haven't already done so, set up Log4j exactly as described here. After making these changes to the log4j. properties file, I did not only receive Log4j messages in the IDE's Output window, but also in the Lumbermill GUI. I have created a webservice in eclipse using axis2. I have configured the log4.properties file as below og4j.rootCategory=INFO, CONSOLE, LOGFILE # Set the enterprise logger priority to FATAL log4j.

Comments
  • Just to save others ninety minutes of irate frustration, do note that if you're using Log4j 2 then the name of the filename needs to be log4j2.properties. (Also note that old examples of log4j.properties configuration don't actually seem to do anything useful in Log4j 2, so make sure to copy your initial configuration from a tutorial dedicated to Log4j 2, and not the older v1.)
  • Well I got farther than usual, but i recieved this after compiling, building, and then running the program: run: log4j:WARN No appenders could be found for logger (log4jexample.Log4jExample). log4j:WARN Please initialize the log4j system properly. log4j:WARN See logging.apache.org/log4j/1.2/faq.html#noconfig for more info. BUILD SUCCESSFUL (total time: 0 seconds)
  • I think that means you haven't added the .properties file properly in your classpath. stackoverflow.com/questions/1485987/…
  • Well the error is gone now, but replaced with a new one: java.lang.NoClassDefFoundError. It's referring to this part of the code: static Logger log = Logger.getLogger(Log4J.class.getName());
  • What is your class called when you run the program?
  • The class is called log4jExample