axiopisty axiopisty - 1 year ago 328
Java Question

How to disable log4j in 3rd party jar?

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:

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

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<log4j:configuration xmlns:log4j="" debug="false">

<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
<param name="Target" value="System.out"/>
<layout class="org.apache.log4j.PatternLayout">
<!-- The default pattern: Date Priority [Category] Message\n -->
<param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{2}] %m%n"/>
<filter class="org.apache.log4j.varia.StringMatchFilter">
<param name="AcceptOnMatch" value="false" />
<param name="StringToMatch" value="Failure while notifying an observer of event [a]" />

<!-- ############### Weld logging ################### -->

<category name="org.jboss.weld">
<priority value="INFO"/>

<priority value="INFO"/>
<appender-ref ref="CONSOLE"/>


I want to disable logging altogether in my application. I tried to disable it providing a file as follows:

log4j.rootLogger=OFF, CONSOLE

No matter what I try to do I cannot prevent the log4j messages from Weld to show up in the console. All I want to do is completely disable logging. But How?

Removed the answer from the OP and added it as the accepted answer.

Answer Source

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" >

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

        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"/>

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

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