java - XPathExpressionException on xpath -

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i'm tring data these xml :

<soapenv:envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://service.alternative.thy.com/" xmlns:req="http://www.thy.com/ws/requestheader" xmlns:ns="http://www.opentravel.org/ota/2003/05"> <soapenv:header/> <soapenv:body>       <ser:gs>          <!--optional:-->          <requestheader>             <!--optional:-->             <req:clientcode>kl7mu</req:clientcode>             <!--optional:-->             <req:clientusername>blabla</req:clientusername>          </requestheader>       </ser:gs>    </soapenv:body>

to clientusername write 

        soapmessage message = context.getmessage();          outputstream os = new bytearrayoutputstream();          message.writeto(os);          string xpath = "////requestheader/req:clientusername";         xpath xpath = xpathfactory.newinstance().newxpath();         string sad = xpath.evaluate(xpath, new inputsource(                 new stringreader(os.tostring())));

but returns :javax.xml.xpath.xpathexpressionexception. think fail reson xpath statement ////requestheader/req:clientusername correct statement?

try : 

soapenv//ser:gs//requestheader//req:clientusername

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