How to log Apache CXF Soap Request and Soap Response using Log4j?

You need to create a file named org.apache.cxf.Logger (that is: org.apache.cxf file with Logger extension) under /META-INF/cxf/ with the following contents:

org.apache.cxf.common.logging.Log4jLogger

Reference: Using Log4j Instead of java.util.logging.

Also if you replace standard:

<cxf:bus>
  <cxf:features>
    <cxf:logging/>
  </cxf:features>
</cxf:bus>

with much more verbose:

<bean id="abstractLoggingInterceptor" abstract="true">
    <property name="prettyLogging" value="true"/>
</bean>
<bean id="loggingInInterceptor" class="org.apache.cxf.interceptor.LoggingInInterceptor" parent="abstractLoggingInterceptor"/>
<bean id="loggingOutInterceptor" class="org.apache.cxf.interceptor.LoggingOutInterceptor" parent="abstractLoggingInterceptor"/>

<cxf:bus>
    <cxf:inInterceptors>
        <ref bean="loggingInInterceptor"/>
    </cxf:inInterceptors>
    <cxf:outInterceptors>
        <ref bean="loggingOutInterceptor"/>
    </cxf:outInterceptors>
    <cxf:outFaultInterceptors>
        <ref bean="loggingOutInterceptor"/>
    </cxf:outFaultInterceptors>
    <cxf:inFaultInterceptors>
        <ref bean="loggingInInterceptor"/>
    </cxf:inFaultInterceptors>
</cxf:bus>

Apache CXF will pretty print XML messages formatting them with proper indentation and line breaks. Very useful. More about it here.