How to disable log4j in 3rd party jar?

Question

I\'m experimenting writing a java SE swing application using JBoss weld. Weld configures logging with log4j using the following log4j.xml file in the jar:

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Answer 1

If a log4j xml-format configuration file is present, it takes precedence over property files. That is log4j defined behavior. So you can put your configuration in log4j.xml and it should take effect.

Answer 2

I think the default log configuration for third part jars won`t print any message into STDOUT or FILE.

But if you want override the default log configuration without document, the best solution is de-compile the jar files and find out how it load the configuration.

Answer 3

Shortly after posting this question I discovered the answer. Create a log4j.xml file to override the defaults in the 3rd party JAR.

Here is an example specific to this thread:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" >
<log4j:configuration>

    <appender name="CA" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%m%n"/>
        </layout>
    </appender>

    <!-- 
        If you want to enable logging for the application
        but wish to disable logging for a specific package
        then use this, where org.jboss is the package
        for which you wish to disable logging.
    -->
    <category name="org.jboss">
        <priority value="off"/>
    </category>

    <root>
        <priority value="off"/> <!--Notice this disables all logging-->
        <appender-ref ref="CA"/>
    </root>

</log4j:configuration>