Top 33 Log4J Warn No Appenders Could Be Found For Logger The 189 Detailed Answer

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How do you solve no Appenders could be found for logger?

Why do I see a warning about no Appenders found for logger and please configure log4j properly?

Why do I see a warning about “No appenders found for logger” and “Please configure log4j properly”? This occurs when the default configuration files log4j. properties and log4j. xml can not be found and the application performs no explicit configuration.

What are logging Appenders?

The appender is the part of a logging system that’s responsible for sending the log messages to some destination or medium.

Where can I find log4j properties file?

During Content Engine installation, two log4j sample files are placed on the system in the ContentEngine\config\samples\ folder: log4j. properties. client: A Java format file that contains client configuration settings.

How do I create a log4j properties file?

How do I add log4j properties to classpath in eclipse?

How does log4j get initialized?

This typically occurs when an application starts up. In a web application, we’d also like log4j to start up when the application starts up. One straightforward way of doing this is to put this log4j initialization in a servletW, and specify for the servlet to start up when the application starts up.

How do I run log4j?

Why log4j is used in Java?

log4j is a tool to help the programmer output log statements to a variety of output targets. In case of problems with an application, it is helpful to enable logging so that the problem can be located. With log4j it is possible to enable logging at runtime without modifying the application binary.

What are log4j Appenders?

Appenders. Apache log4j provides Appender objects which are primarily responsible for printing logging messages to different destinations such as consoles, files, sockets, NT event logs, etc. Each Appender object has different properties associated with it, and these properties indicate the behavior of that object.

What is log4j logger?

log4j is a reliable, fast and flexible logging framework (APIs) written in Java, which is distributed under the Apache Software License. log4j has been ported to the C, C++, C#, Perl, Python, Ruby, and Eiffel languages. log4j is highly configurable through external configuration files at runtime.

How does log4j logging work?

Log4j allows logged messages to contain format strings that reference external information through the Java Naming and Directory Interface (JNDI). This allows information to be remotely retrieved across a variety of protocols, including the Lightweight Directory Access Protocol (LDAP).

How do you setup log4j properties file in POM xml?

How do I add log4j to POM xml?

Where can I find log4j in Java?

Navigate into the “META-INF” sub-directory and open the file “MANIFEST. MF” in a text editor. Find the line starting with “Implementation-Version”, this is the Log4j version.

How do I resolve log4j error?

What does BasicConfigurator configure () do?

What BasicConfigurator. configure() do is adding root logger to a ConsoleAppender and set the appender layout to a PatternLayout with the pattern “%r [%t] %-5p %c – %m%n”. So you need to set the root logger’s level.

Which of the following is the correct order for log4j levels?

Log4j Level Order/Priority

Trace < Debug < Info < Warn < Error < Fatal.

What is log4j Rootlogger?

The rootlogger is always the logger configured in the log4j. properties file, so every child logger used in the application inherits the configuration of the rootlogger . The logging levels are (from smaller to greater) : ALL, DEBUG, INFO, WARN, ERROR, FATAL, OFF .

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log4jWARN No appenders could be found for logger

log4jWARN No appenders could be found for logger

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java – No appenders could be found for logger(log4j)? – Stack Overflow

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java – No appenders could be found for logger(log4j)? – Stack Overflow

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No appenders could be found for logger(log4j)?

This is just a warning.

Fixing

This occurs when the default configuration files log4j.properties and log4j.xml can not be found and the application performs no explicit configuration.

To fix that, simply create/copy log4j.properties or log4j.xml into your a location on the classpath (usually the same as the jar files).

Optionally set java option: -Dlog4j.configuration=file:///path/to/log4j.properties .

log4j uses Thread.getContextClassLoader().getResource() to locate the default configuration files and does not directly check the file system. Knowing the appropriate location to place log4j.properties or log4j.xml requires understanding the search strategy of the class loader in use. log4j does not provide a default configuration since output to the console or to the file system may be prohibited in some environments.

Debugging

For debugging, you may try to use -Dlog4j.debug=true parameter.

Configuration of log4j.properties

Sample configuration of log4j.properties :

# Set root logger level to DEBUG and its only appender to A1. log4j.rootLogger=DEBUG, A1 # A1 is set to be a ConsoleAppender. log4j.appender.A1=org.apache.log4j.ConsoleAppender # A1 uses PatternLayout. log4j.appender.A1.layout=org.apache.log4j.PatternLayout log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x – %m%n # Print only messages of level WARN or above in the package com.foo. log4j.logger.com.foo=WARN

Here is another configuration file that uses multiple appenders:

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=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

Apache Solr

If using Solr, copy /example/resources/log4j.properties into a location on the classpath.

Sample configuration of log4j.properties from Solr goes like:

# Logging level solr.log=logs/ log4j.rootLogger=INFO, file, CONSOLE log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout log4j.appender.CONSOLE.layout.ConversionPattern=%-4r [%t] %-5p %c %x \u2013 %m%n #- size rotation with log cleanup. log4j.appender.file=org.apache.log4j.RollingFileAppender log4j.appender.file.MaxFileSize=4MB log4j.appender.file.MaxBackupIndex=9 #- File to log to and log format log4j.appender.file.File=${solr.log}/solr.log log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%-5p – %d{yyyy-MM-dd HH:mm:ss.SSS}; %C; %m

log4j.logger.org.apache.zookeeper=WARN log4j.logger.org.apache.hadoop=WARN # set to INFO to enable infostream log messages log4j.logger.org.apache.solr.update.LoggingInfoStream=OFF

See also:

Fix for log4j WARN No appenders could be found for logger, Please initialize the log4j system properly

If you are reading this, you must be using log4j framework and got below error message.

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

Log4j warning for no appenders will come to console for standalone applications and in server logs for web applications running into some servlet container such as Tomcat or JBoss.

There could be multiple reasons for log4j warning no appenders found, let’s look at common reasons and how to fix them.

log4j.xml or log4j.properties file are not in classpath

This is the most common reason, log4j framework look for log4j.xml or log4j.properties file in the classpath of your application. If you have a maven based application, you can create a source folder and put the configuration files there, as shown in below image.

If you are using log4j in web applications then check for this configuration file at WEB-INF/classes directory. If it’s not there then check that your source folders are properly configured.

log4j configuration file name is something different

Log4j looks for standard file names, so if your log4j configuration file name is myapp-log4j.xml or myapp-log4j.properties then log4j won’t be able to load it automatically and you will get standard warning message.

For standalone java application, you can fix it easily through configuring it inside main method before using it. For example;

/** * method to init log4j configurations, should be called first before using logging */ private static void init() { DOMConfigurator.configure(“myapp-log4j.xml”); // OR for property file, should use any one of these //PropertyConfigurator.configure(“myapp-log4j.properties”); }

But you can’t use this simple approach with web application, because the configuration file is inside WEB-INF/classes directory. You can do this configuration through ServletContextListener as shown in below code.

public final class Log4jInitListener implements ServletContextListener { public void contextDestroyed(ServletContextEvent paramServletContextEvent) { } public void contextInitialized(ServletContextEvent servletContext) { String webAppPath = servletContext.getServletContext().getRealPath(“/”); String log4jFilePath = webAppPath + “WEB-INF/classes/myapp-log4j.xml”; DOMConfigurator.configure(log4jFilePath); System.out.println(“initialized log4j configuration from file:”+log4jFilePath); } }

Another approach is to set the log4j.configuration system property through java options like below.

-Dlog4j.configuration=file:///path/to/your/myapp-log4j.xml

Log4j framework is smart enough to use DOMConfigurator or PropertyConfigurator based on the file extension.

That’s all, log4j is simple to use once you get hold of these initial issues.

References:

No appenders could be found for logger(log4j)?

This is just a warning.

Fixing

This occurs when the default configuration files log4j.properties and log4j.xml can not be found and the application performs no explicit configuration.

To fix that, simply create/copy log4j.properties or log4j.xml into your a location on the classpath (usually the same as the jar files).

Optionally set java option: -Dlog4j.configuration=file:///path/to/log4j.properties .

log4j uses Thread.getContextClassLoader().getResource() to locate the default configuration files and does not directly check the file system. Knowing the appropriate location to place log4j.properties or log4j.xml requires understanding the search strategy of the class loader in use. log4j does not provide a default configuration since output to the console or to the file system may be prohibited in some environments.

Debugging

For debugging, you may try to use -Dlog4j.debug=true parameter.

Configuration of log4j.properties

Sample configuration of log4j.properties :

# Set root logger level to DEBUG and its only appender to A1. log4j.rootLogger=DEBUG, A1 # A1 is set to be a ConsoleAppender. log4j.appender.A1=org.apache.log4j.ConsoleAppender # A1 uses PatternLayout. log4j.appender.A1.layout=org.apache.log4j.PatternLayout log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x – %m%n # Print only messages of level WARN or above in the package com.foo. log4j.logger.com.foo=WARN

Here is another configuration file that uses multiple appenders:

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=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

Apache Solr

If using Solr, copy /example/resources/log4j.properties into a location on the classpath.

Sample configuration of log4j.properties from Solr goes like:

# Logging level solr.log=logs/ log4j.rootLogger=INFO, file, CONSOLE log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout log4j.appender.CONSOLE.layout.ConversionPattern=%-4r [%t] %-5p %c %x \u2013 %m%n #- size rotation with log cleanup. log4j.appender.file=org.apache.log4j.RollingFileAppender log4j.appender.file.MaxFileSize=4MB log4j.appender.file.MaxBackupIndex=9 #- File to log to and log format log4j.appender.file.File=${solr.log}/solr.log log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%-5p – %d{yyyy-MM-dd HH:mm:ss.SSS}; %C; %m

log4j.logger.org.apache.zookeeper=WARN log4j.logger.org.apache.hadoop=WARN # set to INFO to enable infostream log messages log4j.logger.org.apache.solr.update.LoggingInfoStream=OFF

See also:

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