why camel can't use log4j.xml

[xiangqiuzhao]

i use log4j.xml in my project classpath, content like:

<log4j:configuration>

        <appender name="camel" class="org.apache.log4j.RollingFileAppender">
                
                
                
                <layout class="org.apache.log4j.PatternLayout">
                        
                </layout>
                <filter class="org.apache.log4j.varia.LevelRangeFilter">
                        
                        
                        
                </filter>
        </appender>

<category name="org.apache.camel" additivity="false">
        <priority value="debug"/>
        <appender-ref ref="camel"/>
        <appender-ref ref="camelerror"/>
        <appender-ref ref="camelstdoutd"/>
    </category>

    <root>
        <priority value="all"></priority>
        <appender-ref ref="async"/>  
    </root>
</log4j:configuration>

why can't logging the debug info into the camel.log file?

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