XML : Java - namespace location in a SOAPMessage

For reasons unbeknownst to me, I need to declare a SOAP namespace in a particular element for this request to work. So, instead of defining wsse in the Envelope element:

  <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">    <SOAP-ENV:Header>      <wsse:Security SOAP-ENV:mustUnderstand="1">                  <wsse:Usernametoken wsu:Id="ID-f0ebb0c1-631e-470a-8552-393e180b4cf9">          <wsse:Username>session</wsse:Username>          <wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">nosession</wsse:Password>        </wsse:Usernametoken>      </wsse:Security>    </SOAP-ENV:Header>    <SOAP-ENV:Body/>  </SOAP-ENV:Envelope>    

I need to define it in the Security element:

  <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">    <SOAP-ENV:Header>      <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1">                  <wsse:Usernametoken wsu:Id="ID-f0ebb0c1-631e-470a-8552-393e180b4cf9">          <wsse:Username>session</wsse:Username>          <wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText">nosession</wsse:Password>        </wsse:Usernametoken>      </wsse:Security>    </SOAP-ENV:Header>    <SOAP-ENV:Body/>  </SOAP-ENV:Envelope>    

But I can't declare the Security element to add the wsse namespace if that element NEEDS the namespace to exist. What should I do? My (nonfunctional) code looks like:

  SOAPElement header = envelope.getHeader();          SOAPElement security = header.addChildElement("Security","wsse");  security.addNamespaceDeclaration("wsse","http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd");  security.setAttribute("SOAP-ENV:mustUnderstand", "1");