Is this error caused by something that I'm doing?

2008-07-17 15:54:24, DEBUG: org.springframework.web.context.request.RequestContextListener.requestDestroyed: Cleared thread-bound request context: [EMAIL PROTECTED]
Jul 17, 2008 3:54:24 PM org.apache.catalina.core.ContainerBase backgroundProcess
WARNING: Exception processing manager [EMAIL PROTECTED] background process
java.lang.NullPointerException
    at org.apache.commons.logging.impl.SLF4JLocationAwareLog.isDebugEnabled(SLF4JLocationAwareLog.java:59)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.buildLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:201)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.findLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:182)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeDestruction(InitDestroyAnnotationBeanPostProcessor.java:160)
    at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:140)
    at org.springframework.beans.factory.support.DisposableBeanAdapter.run(DisposableBeanAdapter.java:134)
    at org.springframework.web.context.request.ServletRequestAttributes$DestructionCallbackBindingListener.valueUnbound(ServletRequestAttributes.java:269)
    at org.apache.catalina.session.StandardSession.removeAttributeInternal(StandardSession.java:1649)
    at org.apache.catalina.session.StandardSession.expire(StandardSession.java:756)
    at org.apache.catalina.session.StandardSession.isValid(StandardSession.java:592)
    at org.apache.catalina.session.ManagerBase.processExpires(ManagerBase.java:682)
    at org.apache.catalina.session.ManagerBase.backgroundProcess(ManagerBase.java:667)
    at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1316)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
    at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
    at java.lang.Thread.run(Unknown Source)


Here's my logback.xml file:

<?xml version="1.0" encoding="UTF-8"?>

<configuration>
    <appender class="ch.qos.logback.core.FileAppender" name="RootFileAppender">
        <file>/tmp/peoplelocator.log</file>
        <append>true</append>
       
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>%d{yyyy-MM-dd HH:mm:ss}, %p,%L,%C.%M %m%n</pattern>
        </layout>
    </appender>

    <appender class="ch.qos.logback.core.ConsoleAppender" name="RootConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>%date{yyyy-MM-dd HH:mm:ss}, %level: %class.%method: %m%n</pattern>
        </layout>
    </appender>

    <logger name="org.springframework.beans">
        <level value="warn" />
    </logger>

    <logger name="org.springframework.binding">
        <level value="debug" />
    </logger>

    <logger name="org.springframework.jdbc">
        <level value="warn" />
    </logger>

    <logger name="org.springframework.transaction">
        <level value="warn" />
    </logger>

    <logger name="org.springframework.orm">
        <level value="warn" />
    </logger>

    <logger name="org.springframework.web">
        <level value="debug" />
    </logger>

    <logger name="org.springframework.faces">
        <level value="debug" />
    </logger>

    <logger name="org.springframework.webflow">
        <level value="debug" />
    </logger>
   
    <logger name="javax.faces.webapp">
        <level value="warn" />
    </logger>

    <logger name="edu.berkeley.ist.peoplelocator">
        <level value="debug" />
    </logger>

    <logger name="org.apache.tiles">
        <level value="debug" />
    </logger>

    <root>
        <level value="info" />

        <appender-ref ref="RootFileAppender" />
        <appender-ref ref="RootConsoleAppender" />
    </root>
</configuration>

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