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Questions tagged [log4j]

log4j is a popular Java-based logging utility. It is a project of the Apache Software Foundation and is licensed under The Apache Software License, Version 2.0

Apache Log4j is a Java-based logging utility. It is a project of the Apache Software Foundation. Log4j is one of several Java Logging Frameworks.

Log4j in written in Java and also support cross platform and available with Apache License 2.0 License.

Log4j helps programmers output log statements from their programs. The log statements can be configured to be output to a variety of locations including the console, files and email. Log4j is a hierarchical logging utility which makes it possible to change the granularity at which log statements are output.

It is common practice to use the program's package structure as the basis for the hierarchy since the package structure of an application is inherently hierarchical and usually correlates to the hierarchy of the program code.

Log4j2.x changes the API and is no longer downward compatible to log4j1.x

Official Website:

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See Also

Latest release log4j1: 1.2.17 released on August 5, 2015

Latest release log4j2: 2.13.3 released on 2020-05-10

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How to disable logging call paths

I'd like to disable the portion of log4j that logs all class/method paths that are being called. For instance... Apr 15, 2013 10:50:52 AM com.production.tasks.ImportNewOrders checkForOrders INFO: ------- Order #295510 Hibernate: select asset0_.id…
Ben
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Hiding or Encrypting Password in log4j.properties file SMTP Appender

I am using custom gmail smtp appendar for sending error logs from my gmail account. Following the instructions: http://www.tgerm.com/2010/05/log4j-smtpappender-gmail-custom.html - Everything works great. Except one thing: In my log4j.properties:…
sahara
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log4j:WARN Please initialize the log4j system properly

How to resolve these following errors... Am I missing some jar file??? log4j:WARN No appenders could be found for logger (smslib). log4j:WARN Please initialize the log4j system properly. org.smslib.GatewayException: Comm library…
Ishan
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'org.apache.commons.logging.impl.Log4JLogger' cannot be found

In my Java Web Service, I am trying to write logs to windows event viewer, using log4j. I am using Eclipse as an IDE to deploy it using Tomcat. this is my log4j.properties: log4j.rootLogger=DEBUG, CA, NTEventLog log4j.rootLogger=DEBUG, CA,…
user1912404
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log4j, want to show only debug(not info) in console and clear log files when app starts

I am new to this log4j and managed to setup on eclipse and get it running. I understand the chain of priority in the levels and right now this is my properties file config: log4j.rootLogger = DEBUG, rollingFile,…
user1897151
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Liferay logging

I know you could define the log level for liferay log on the path /liferay-portal-6.1.10-ee-ga1/logs/liferay.yyyy-mm-dd.log through Control Panel -> Server Adminstration -> Log levels . But this is so hard to do, since there are many pages to go…
Adia
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Prevent specific exceptions loggin in Grails

In grails I want to stop logging some specific exceptions occouring in my controllers. I have managed this exception with urlmapping to render a custome warning page Es my url mapping "500"(controller:'error', action:'excOne', exception:…
Fabiano Taioli
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What is Maven doing with my testclasspath

I'm having issues with a test, which when executed in maven fails to initialize log4j, although a valid log4j.properties is in src/test/resources and therefore should end up on the classpath of the test. But it doesn't, i.e. log4j prints…
Jens Schauder
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Logging arbitrary objects

I'm working on a logging framework for an enterprise system and have been looking at both logback and log4j as logging backends but trying to use slf4j to keep the backend implementation out of it. We want to log messages out in JSON format and I've…
StFS
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Log4j configuration(Size Based) not working

I have my application for which the below entry is done in Log4j properties file.Size based rolling is not working for this application. File does not rollover at 5 MB and the application keeps on logging and making it in GB. In one run…
Ashu
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If FileAppender fails, revert to ConsoleAppender

With log4j, I'd like to revert to a ConsoleAppender if the FileAppender has problems writing to the specified log file. This means catching a FileNotFoundException or an IOException and switching to a ConsoleAppender. Has this been done before or…
dogbane
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Configuring log4j with jboss-as-7.1.1

I have been reading a lot on this forum,jboss docs and on the internet to successfully get log4j configuration to work with jboss as 7.1.1, I do not want to use the logging subsystem in jboss. I want to use my own log4j configuration. My jboss…
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Under Spring Framework: WARN: WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader)

I have spent all day trying to solve the logging problem I'm having with log4j in a webapp. No matter what I do, I cannot get rid of the following: log4j:WARN No appenders could be found for logger…
Eric T.
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How to use DTD ENTITY external reference in log4j.xml

I tried to use entities from external dtd file. ] > log4j-entity.dtd
Mawia
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Different applications writing to same log4j log file

I have 4 java/Java EE applications- Two are server based j2ee applications running in WebSphere. Other two are standalone java applications. My logging framework is log4j using log4j.properties. Question 1: Can I have a same log file for logging…
user1929905
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