java - @RequestBody is not working when used along with params attribute in @RequestMapping annotation -

my code below works fine , reads xml content @requestbody parameter

@requestmapping(method = requestmethod.post, value = "{clientcode}/paybycell.xml") public modelandview paybycell(         httpservletrequest request,         httpservletresponse response,         @requestbody string xml,         @pathvariable("clientcode") string clcode,         @requestparam integer customerid)         throws invalidrequestxmlexception, internalexception, exception {     info("request body=="+xml);     getservice().validatecitycodecid(clcode, customerid);     paybycell(xml, clcode, customerid);     response.setstatus(httpstatus.sc_ok);     return null; } 

the log file shows content eg

request body==<?xml version="1.0"encoding="utf-8" ?> <paybycell> 

but wanted use same url pattern on different method baesd on request parameter,hence added params attribute in @requestmapping element shown below

@requestmapping(method = requestmethod.post, value = "/{clientcode}/paybycell.xml", params = { "customerid", "vendorname"}) public modelandview paybycellmultiplevendor(         httpservletrequest request,         httpservletresponse response,         @requestbody string xml,         @pathvariable("clientcode") string clcode,         @requestparam("customerid") integer customerid,         @requestparam("vendorname") string vendorname)         throws invalidrequestxmlexception, internalexception, exception {     if (vendorname == null) {         throw new badrequestexception("check vendorname");     }     info("request body=="+xml);     getservice().validatecitycodecid(clcode, customerid);     paybycell(xml, clcode, customerid, vendorname);     response.setstatus(httpstatus.sc_ok);     return null; } 

but @requestbody content not read , shows empty vlue in logs like

request body== 

what wrong.?

thanks in advance help