Spring 3 SimpleMappingExceptionResolver warnLogCategory log4j

<bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <property name="exceptionMappings">
            <map>
              <entry key="java.lang.Exception" value="error"/>
            </map>
          </property>
<property name="warnLogCategory" value="abcdefg"/>
</bean>

I would like to log the exception above into a .log file, but it does not log =(. Could someone comment on what might be wrong with my log4j properties...or anything else?

Using Spring 3.0.5

thanks

log4j.rootLogger=DEBUG, stdout, pqe
log4j.category.abcdefg=WARN, pqe

log4j.appender.pqe=org.apache.log4j.DailyRollingFileAppender
log4j.appender.pqe.DatePattern=_yyyyMMdd
log4j.appender.pqe.File=D:\\pqe.log
log4j.appender.pqe.layout=org.apache.log4j.PatternLayout
log4j.appender.pqe.layout.ConversionPattern=%d|%5p|%c %m%n