How to disable Webwork validation logging

I try validation through xml file
@xwork.xml
    <action name="TestAction" class="com.pda.webwork.action.TestAction">
    	<result name="input" type="dispatcher">/JSP/TestForm.jsp</result>
       	<result name="success" type="dispatcher">/JSP/TestPage.jsp</result>
      <interceptor-ref name="validationWorkflowStack"/>      
    </action> 
@TestAction-validation.xml 
    <field name="surname">
        <field-validator type="requiredstring">
            <message>surname is required.</message>
        </field-validator>
    </field>
@TestForm.jsp
<ww:form action="TestAction.action" method="post">
	<ww:textfield name="firstName"></ww:textfield>
	<ww:textfield name="surname"></ww:textfield>
	<ww:submit value="submit"></ww:submit>
</ww:form>

When I open the TestForm.jsp, I get long list of logging messages at server console. Below are some sample lines. 

[i]DEBUG   11482   [freemark] (): template/xhtml/submit.ftl[en_US,UTF-8,parsed] using cached since jar:file:/D:/Codes/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/webapps/PDA/WEB-INF/lib/webwork-2.2.2.jar!/template/xhtml/submit.ftl didn't change.
DEBUG   11482   [freemark] (): template/simple/submit.ftl[en_US,UTF-8,parsed] using cached since jar:file:/D:/Codes/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/webapps/PDA/WEB-INF/lib/webwork-2.2.2.jar!/template/simple/submit.ftl didn't change.
DEBUG   11482   [freemark] (): Key 'name' was not found on instance of java.util.HashMap. Introspection information for the class is: {java.lang.Object@19e215b={public void 
.....[/i]

Do anyone know how to disable those logging? 
In log4j.properties, I did set logging level above DEBUG


# Set root logger level to WARN and append to stdout
log4j.rootLogger=WARN, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# OpenSymphony Stuff
log4j.logger.com.opensymphony=ERROR
log4j.logger.com.opensymphony.webwork=ERROR

Thx in advance
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