Hi all,

I have a problem setting up log4j. I want keep the standard JBoss INFO messages appended to the console.
In addition to this I also want to print DEBUG messages of some of my specific classes.

I made the following configuration:

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

<!-- ===================================================================== -->
<!-- -->
<!-- Log4j Configuration -->
<!-- -->
<!-- ===================================================================== -->

<!-- $Id: log4j.xml,v 1.13.2.8 2003/09/23 14:16:27 slaboure Exp $ -->

<!--
 | For more configuration infromation and examples see the Jakarta Log4j
 | owebsite: http://jakarta.apache.org/log4j
 -->

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">


 <!-- ================================= -->
 <!-- Preserve messages in a local file -->
 <!-- ================================= -->

 <!-- A time/date based rolling appender -->
 <appender name="FILE" class="org.jboss.logging.appender.DailyRollingFileAppender">
 <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/>
 <param name="File" value="/log/server.log"/>
 <param name="Append" value="false"/>

 <!-- Rollover at midnight each day -->
 <param name="DatePattern" value="'.'yyyy-MM-dd"/>

 <!-- Rollover at the top of each hour
 <param name="DatePattern" value="'.'yyyy-MM-dd-HH"/>
 -->

 <layout class="org.apache.log4j.PatternLayout">
 <!-- The default pattern: Date Priority [Category] Message\n -->
 <param name="ConversionPattern" value="%d %-5p [%c] %m%n"/>

 <!-- The full pattern: Date MS Priority [Category] (Thread:NDC) Message\n
 <param name="ConversionPattern" value="%d %-5r %-5p [%c] (%t:%x) %m%n"/>
 -->
 </layout>
 </appender>

 <!-- A size based file rolling appender
 <appender name="FILE" class="org.jboss.logging.appender.RollingFileAppender">
 <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/>
 <param name="File" value="/log/server.log"/>
 <param name="Append" value="false"/>
 <param name="MaxFileSize" value="500KB"/>
 <param name="MaxBackupIndex" value="1"/>

 <layout class="org.apache.log4j.PatternLayout">
 <param name="ConversionPattern" value="%d %-5p [%c] %m%n"/>
 </layout>
 </appender>
 -->

 <!-- ============================== -->
 <!-- Append messages to the console -->
 <!-- ============================== -->
 <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
 <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/>
 <param name="Target" value="System.out"/>
 <param name="Threshold" value="INFO"/>

 <layout class="org.apache.log4j.PatternLayout">
 <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{1}] %m%n"/>
 </layout>
 </appender>

 <appender name="INFORMATIEFABRIEK" class="org.apache.log4j.ConsoleAppender">
 <param name="Target" value="System.out"/>
 <param name="Threshold" value="DEBUG"/>
 <layout class="org.apache.log4j.PatternLayout">
 <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{1}]
%m%n"/>
 </layout>
 </appender>



 <appender name="JSR77" class="org.apache.log4j.FileAppender">
 <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/>
 <param name="Append" value="false"/>
 <param name="File" value="/log/jsr77.log"/>
 <layout class="org.apache.log4j.PatternLayout">
 <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c{1}] %m%n"/>
 </layout>
 </appender>

 <!-- ====================== -->
 <!-- More Appender examples -->
 <!-- ====================== -->

 <!-- Buffer events and log them asynchronously
 <appender name="ASYNC" class="org.apache.log4j.AsyncAppender">
 <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/>
 <appender-ref ref="FILE"/>
 <appender-ref ref="CONSOLE"/>
 <appender-ref ref="SMTP"/>
 </appender>
 -->

 <!-- EMail events to an administrator
 <appender name="SMTP" class="org.apache.log4j.net.SMTPAppender">
 <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/>
 <param name="Threshold" value="ERROR"/>
 <param name="To" value="admin@myhost.domain.com"/>
 <param name="From" value="nobody@myhost.domain.com"/>
 <param name="Subject" value="JBoss Sever Errors"/>
 <param name="SMTPHost" value="localhost"/>
 <param name="BufferSize" value="10"/>
 <layout class="org.apache.log4j.PatternLayout">
 <param name="ConversionPattern" value="[%d{ABSOLUTE},%c{1}] %m%n"/>
 </layout>
 </appender>
 -->

 <!-- Syslog events
 <appender name="SYSLOG" class="org.apache.log4j.net.SyslogAppender">
 <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/>
 <param name="Facility" value="LOCAL7"/>
 <param name="FacilityPrinting" value="true"/>
 <param name="SyslogHost" value="localhost"/>
 </appender>
 -->

 <!-- Log events to JMS (requires a topic to be created)
 <appender name="JMS" class="org.apache.log4j.net.JMSAppender">
 <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/>
 <param name="Threshold" value="ERROR"/>
 <param name="TopicConnectionFactoryBindingName" value="java:/ConnectionFactory"/>
 <param name="TopicBindingName" value="topic/MyErrorsTopic"/>
 </appender>
 -->

 <!-- Log events through SNMP
 <appender name="TRAP_LOG" class="org.apache.log4j.ext.SNMPTrapAppender">
 <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/>
 <param name="ImplementationClassName" value="org.apache.log4j.ext.JoeSNMPTrapSender"/>
 <param name="ManagementHost" value="127.0.0.1"/>
 <param name="ManagementHostTrapListenPort" value="162"/>
 <param name="EnterpriseOID" value="1.3.6.1.4.1.24.0"/>
 <param name="LocalIPAddress" value="127.0.0.1"/>
 <param name="LocalTrapSendPort" value="161"/>
 <param name="GenericTrapType" value="6"/>
 <param name="SpecificTrapType" value="12345678"/>
 <param name="CommunityString" value="public"/>
 <param name="ForwardStackTraceWithTrap" value="true"/>
 <param name="Threshold" value="DEBUG"/>
 <param name="ApplicationTrapOID" value="1.3.6.1.4.1.24.12.10.22.64"/>
 <layout class="org.apache.log4j.PatternLayout">
 <param name="ConversionPattern" value="%d,%p,[%t],[%c],%m%n"/>
 </layout>
 </appender>
 -->

 <!-- ================ -->
 <!-- Limit categories -->
 <!-- ================ -->

 <!-- Limit the org.apache.commons category to INFO as its DEBUG is verbose -->
 <category name="org.apache.commons">
 <priority value="INFO"/>
 </category>

 <!-- Limit JBoss categories to INFO -->
 <category name="org.jboss">
 <priority value="INFO"/>
 </category>

 <category name="nl.informatiefabriek">
 <additivity value="false"/>
 <appender-ref ref="INFORMATIEFABRIEK"/>
 </category>


 <!-- Decrease the priority threshold for the org.jboss.varia category
 <category name="org.jboss.varia">
 <priority value="DEBUG"/>
 </category>
 -->

 <!-- Show the evolution of the DataSource pool in the logs [inUse/Available/Max]
 <category name="org.jboss.resource.connectionmanager.JBossManagedConnectionPool">
 <priority value="TRACE" class="org.jboss.logging.XLevel"/>
 </category>
 -->

 <!--
 | An example of enabling the custom TRACE level priority that is used
 | by the JBoss internals to diagnose low level details. This example
 | turns on TRACE level msgs for the org.jboss.ejb.plugins package and its
 | subpackages. This will produce A LOT of logging output.
 <category name="org.jboss.system">
 <priority value="TRACE" class="org.jboss.logging.XLevel"/>
 </category>
 <category name="org.jboss.ejb.plugins">
 <priority value="TRACE" class="org.jboss.logging.XLevel"/>
 </category>
 -->

 <!--
 | Logs these events to SNMP:
 - server starts/stops
 - cluster evolution (node death/startup)
 - When an EJB archive is deployed (and associated verified messages)
 - When an EAR archive is deployed

 <category name="org.jboss.system.server.Server">
 <priority value="INFO" />
 <appender-ref ref="TRAP_LOG"/>
 </category>

 <category name="org.jboss.ha.framework.interfaces.HAPartition.lifecycle">
 <priority value="INFO" />
 <appender-ref ref="TRAP_LOG"/>
 </category>

 <category name="org.jboss.deployment.MainDeployer">
 <priority value="ERROR" />
 <appender-ref ref="TRAP_LOG"/>
 </category>

 <category name="org.jboss.ejb.EJBDeployer">
 <priority value="INFO" />
 <appender-ref ref="TRAP_LOG"/>
 </category>

 <category name="org.jboss.deployment.EARDeployer">
 <priority value="INFO" />
 <appender-ref ref="TRAP_LOG"/>
 </category>


 -->


 <!-- ======================= -->
 <!-- Setup the Root category -->
 <!-- ======================= -->

 <root>
 <appender-ref ref="CONSOLE"/>
 <appender-ref ref="FILE"/>
 </root>

 <!-- Clustering logging -->
 <!-- Uncomment the following to redirect the org.jgroups and
 org.jboss.ha categories to a cluster.log file.

 <appender name="CLUSTER" class="org.jboss.logging.appender.RollingFileAppender">
 <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/>
 <param name="File" value="/log/cluster.log"/>
 <param name="Append" value="false"/>
 <param name="MaxFileSize" value="500KB"/>
 <param name="MaxBackupIndex" value="1"/>

 <layout class="org.apache.log4j.PatternLayout">
 <param name="ConversionPattern" value="%d %-5p [%c] %m%n"/>
 </layout>
 </appender>
 <category name="org.jgroups">
 <priority value="DEBUG" />
 <appender-ref ref="CLUSTER"/>
 </category>
 <category name="org.jboss.ha">
 <priority value="DEBUG" />
 <appender-ref ref="CLUSTER"/>
 </category>
 -->

</log4j:configuration>

The problem however now is that when a class in the nl.informatiefabriek package logs an INFO messages this get displayed TWICE!
DEBUG messages are printed just fine.

I think this is because both the appenders print the same message.

How can I configure log4j to print my INFO messages only ONCE. And still keep the JBoss standard INFO messages?

Thanks!