[log4j] Comment désactver les messages de debug interne?

Bonjour à tous,
Je travaille sur une application web dans laquelle je gère le logging avec log4j pour la 1ère fois. J'ai réalisé un fichier log4j.xml qui marche bien. Seul soucis, sur la console, les messages de debug interne à log4j sont affichés. comment paramétrer pour les désactiver. Ces messages sont les suivants:
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    [java] log4j-internal: 78 xml.DOMConfigurator    - Handling nested <layout> for appender ReportingService_Exception
     [java] log4j-internal: 78 config.PropertySetter  - Found setter method for property [layout] in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 78 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.PatternLayout]
     [java] log4j-internal: 78 xml.DOMConfigurator    - Configuring parameter [ConversionPattern] for <layout>.
     [java] log4j-internal: 78 config.PropertySetter  - Set child component of type [org.apache.log4j.PatternLayout] for [org.apache.log4j.RollingFileAppender].
     [java] log4j-internal: 157 xml.DOMConfigurator    - Handling nested <filter> for appender ReportingService_Exception
     [java] log4j-internal: 157 config.PropertySetter  - Found addFilter method in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 157 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.varia.LevelMatchFilter]
     [java] log4j-internal: 172 xml.DOMConfigurator    - Configuring parameter [levelToMatch] for <filter>.
     [java] log4j-internal: 172 xml.DOMConfigurator    - Handling nested <filter> for appender ReportingService_Exception
     [java] log4j-internal: 172 config.PropertySetter  - Found addFilter method in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 172 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.varia.DenyAllFilter]
     [java] log4j-internal: 172 xml.DOMConfigurator    - Handling nested <layout> for appender ReportingService_Warning
     [java] log4j-internal: 172 config.PropertySetter  - Found setter method for property [layout] in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 266 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.PatternLayout]
     [java] log4j-internal: 266 xml.DOMConfigurator    - Configuring parameter [ConversionPattern] for <layout>.
     [java] log4j-internal: 282 config.PropertySetter  - Set child component of type [org.apache.log4j.PatternLayout] for [org.apache.log4j.RollingFileAppender].
     [java] log4j-internal: 282 xml.DOMConfigurator    - Handling nested <filter> for appender ReportingService_Warning
     [java] log4j-internal: 282 config.PropertySetter  - Found addFilter method in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 282 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.varia.LevelMatchFilter]
     [java] log4j-internal: 282 xml.DOMConfigurator    - Configuring parameter [levelToMatch] for <filter>.
     [java] log4j-internal: 375 xml.DOMConfigurator    - Handling nested <filter> for appender ReportingService_Warning
     [java] log4j-internal: 375 config.PropertySetter  - Found addFilter method in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 375 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.varia.DenyAllFilter]
     [java] log4j-internal: 375 xml.DOMConfigurator    - Handling nested <layout> for appender ReportingService_Info
     [java] log4j-internal: 375 config.PropertySetter  - Found setter method for property [layout] in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 375 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.PatternLayout]
     [java] log4j-internal: 375 xml.DOMConfigurator    - Configuring parameter [ConversionPattern] for <layout>.
     [java] log4j-internal: 375 config.PropertySetter  - Set child component of type [org.apache.log4j.PatternLayout] for [org.apache.log4j.RollingFileAppender].
     [java] log4j-internal: 375 xml.DOMConfigurator    - Handling nested <filter> for appender ReportingService_Info
     [java] log4j-internal: 375 config.PropertySetter  - Found addFilter method in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 375 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.varia.LevelMatchFilter]
     [java] log4j-internal: 375 xml.DOMConfigurator    - Configuring parameter [levelToMatch] for <filter>.
     [java] log4j-internal: 485 xml.DOMConfigurator    - Handling nested <filter> for appender ReportingService_Info
     [java] log4j-internal: 485 config.PropertySetter  - Found addFilter method in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 485 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.varia.DenyAllFilter]
     [java] log4j-internal: 485 xml.DOMConfigurator    - Handling nested <layout> for appender ReportingService_Debug
     [java] log4j-internal: 485 config.PropertySetter  - Found setter method for property [layout] in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 485 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.PatternLayout]
     [java] log4j-internal: 485 xml.DOMConfigurator    - Configuring parameter [ConversionPattern] for <layout>.
     [java] log4j-internal: 485 config.PropertySetter  - Set child component of type [org.apache.log4j.PatternLayout] for [org.apache.log4j.RollingFileAppender].
     [java] log4j-internal: 485 xml.DOMConfigurator    - Handling nested <filter> for appender ReportingService_Debug
     [java] log4j-internal: 485 config.PropertySetter  - Found addFilter method in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 485 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.varia.LevelMatchFilter]
     [java] log4j-internal: 485 xml.DOMConfigurator    - Configuring parameter [levelToMatch] for <filter>.
     [java] log4j-internal: 485 xml.DOMConfigurator    - Handling nested <filter> for appender ReportingService_Debug
     [java] log4j-internal: 485 config.PropertySetter  - Found addFilter method in class org.apache.log4j.RollingFileAppender
     [java] log4j-internal: 485 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.varia.DenyAllFilter]
     [java] log4j-internal: 500 xml.DOMConfigurator    - Handling nested <layout> for appender console
     [java] log4j-internal: 500 config.PropertySetter  - Found setter method for property [layout] in class org.apache.log4j.ConsoleAppender
     [java] log4j-internal: 500 xml.DOMConfigurator    - Will instantiate instance of class [org.apache.log4j.PatternLayout]
     [java] log4j-internal: 500 xml.DOMConfigurator    - Configuring parameter [ConversionPattern] for <layout>.
     [java] log4j-internal: 500 config.PropertySetter  - Set child component of type [org.apache.log4j.PatternLayout] for [org.apache.log4j.ConsoleAppender].
Merci d'avance de votre aide.