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Editorial Team
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Asked: 2026-05-18T06:31:41+00:00

I want to config my logging system based on slf4j and log4j . I

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I want to config my logging system based on slf4j and log4j. I want to log all messages from com.A class. And only those messages.

so I wrote in my config file 

log4j.rootLogger=FATAL, All
log4j.rootLogger=DEBUG, A1
log4j.appender.A1=com.A
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.conversionPattern=%m%n

My runner (com.Start class) contains 

PropertyConfigurator.configure("log4j.properties");

But when I start application I get 

log4j:ERROR A "com.A" object is not assignable to a "org.apache.log4j.Appender" variable.
log4j:ERROR The class "org.apache.log4j.Appender" was loaded by 
log4j:ERROR [sun.misc.Launcher$AppClassLoader@d9f9c3] whereas object of type 
log4j:ERROR "com.A" was loaded by [sun.misc.Launcher$AppClassLoader@d9f9c3].
log4j:ERROR Could not instantiate appender named "A1".
log4j:WARN No appenders could be found for logger (com.Start).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

Where’s my error?

Thanks.

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1 Answer

  1. Editorial Team

    Your configuration file isn’t properly written.

    Appender shouldn’t be the class/package deceleration but a type of appender you would like to output messages to (leave it blank if you wish to output to the default appender)
    The file should look more like:

    log4j.rootLogger=FATAL 
log4j.logger.com.A=DEBUG
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