log4j configuration not used

问题

My log4j logger does not want to use the log4j.xml file to be configured. This file is located in the src folder and looks like that:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration>
    <appender name="ROLLING" class="org.apache.log4j.RollingFileAppender">
        <param name="File" value="C:\debug\myproject\logfile.log" />
        <param name="MaxFileSize" value="10024KB" />
        <param name="MaxBackupIndex" value="5" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%-5p %d{dd-MM HH:mm:ss,SSS} (%F:%M:%L)  -%m%n" />
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <param name="LevelMin" value="DEBUG" />
            <param name="LevelMax" value="FATAL" />
        </filter>
    </appender>
    <root>
        <level value="DEBUG" />
        <appender-ref ref="ROLLING" />
    </root>
</log4j:configuration>

But logfile.log is still empty and there is no "DEBUG" line in the console.

NB: it is a Java EE project on JBoss 7.1.0 and using Struts2.

回答1:

The following answer is not entirely mine. It was posted in the question itself by the OP, so I'm moving it into this community wiki answer.

---

I resolved it by explicitely configuring the logging configuration.

Note that you won't be able to change the configuration at runtime if you configure it using a file.

For more information, see: https://docs.jboss.org/author/display/AS71/How+To#HowTo-HowdoIuselog4j.propertiesorlog4j.xmlinsteadofusingtheloggingsubsystemconfiguration%3F

回答2:

Make sure the log4j.xml file is located in the /WEB-INF/classes directory of your web application.

回答3:

The problem was with the log file. If you use the absolute file name make sure to replace backslashes with slash. For example

<param name="File" value="C:/debug/myproject/logfile.log" /> 

来源：https://stackoverflow.com/questions/15026408/log4j-configuration-not-used