logger print null but echo print message in mule flow

Question

I am iterating xml in foreach. Echo is printing correct message but logger is print null.

<foreach collection="#[xpath('//xmlsoap/soap/soapenv:Envelope')]"
            doc:name="For Each">
            <echo-component />
            <logger level="INFO" category="ProTSP Logger" message="#[payload]"
            doc:name="Logger" />
        </foreach>

Answer 1

I resolved my problem using dom to xml transformer.

<foreach collection="#[xpath('//xmlsoap/soap/soapenv:Envelope')]"
            doc:name="For Each">

            <echo-component doc:name="Echo"/>
            <mulexml:dom-to-xml-transformer doc:name="DOM to XML"/>



            <logger level="INFO" category="ProTSP Logger" message="#[payload]"
                doc:name="Logger" />
        </foreach>