http - Android - Volley post parameters adding extra '&' -

i converting application use volley framework.

i have working far can tell, when make webservice request using httpclient, wireshark showing parameters

deviceprint=android&mobilesaveuserid=false&__responsetype=xml&appversion=android-3.2&__responsetypeversion=1.0&userid=mbltest6&retrievepostedtransaction=falsehttp/1.1 200 ok

this works perfectly, when use volley, packet looks this.

deviceprint=android&mobilesaveuserid=false&__responsetype=xml&appversion=android-3.2&__responsetypeversion=1.0&userid=mbltest6&retrievepostedtransaction=false&http/1.1 200 ok

i moved them side side , noticed volley example (the bottom one) appending "&" causing webservice return "username not found" though in there.

any suggestions on how fix this? or why it's happening?

edit: upon further investigation base classes, when set parameters adds "&" end of string. normal behavior volley? whats causing request fail?

private byte[] encodeparameters(map<string, string> params, string paramsencoding) {     stringbuilder encodedparams = new stringbuilder();      try {         iterator uee = params.entryset().iterator();          while(uee.hasnext()) {             java.util.map.entry entry = (java.util.map.entry)uee.next();             encodedparams.append(urlencoder.encode((string)entry.getkey(), paramsencoding));             encodedparams.append('=');             encodedparams.append(urlencoder.encode((string)entry.getvalue(), paramsencoding));             encodedparams.append('&');         }          return encodedparams.tostring().getbytes(paramsencoding);     } catch (unsupportedencodingexception var6) {         throw new runtimeexception("encoding not supported: " + paramsencoding, var6);     } } 

my code follows:

public abstract class webservicerequest extends stringrequest {  private static final int socket_timeout = (1000 * 60);  private static final string response_type_key = "__responsetype"; private static final string response_type_version_key = "__responsetypeversion"; private static final string app_version_key = "appversion"; private static final string retrieve_posted_key = "retrievepostedtransaction";  public boolean mretrievepostedtransactions; private map<string, string> mparameters;  public webservicerequest(string url, response.listener<string> listener, response.errorlistener errorlistener) {     super(method.post, url, listener, errorlistener);     this.mparameters = new hashmap<>();     setretrypolicy(new defaultretrypolicy(             socket_timeout,             defaultretrypolicy.default_max_retries,             defaultretrypolicy.default_backoff_mult     )); }   public abstract void setparams(map<string,string> params);   @override protected map<string, string> getparams() throws authfailureerror {     setcommonparameters(mparameters);     setparams(mparameters);     return mparameters; }  private map<string, string> setcommonparameters (map<string,string> params) {     params.put( app_version_key, "android-" + virtualwalletapplication.getinstance().appversion );     params.put( response_type_key, "xml" );     params.put( response_type_version_key, "1.0" );     params.put( retrieve_posted_key, boolean.valueof( mretrievepostedtransactions ).tostring() );     return params; } 

}

here create request

 webservicerequest request = new webservicerequest(             stringutils.getfullserverurlforresource("/alservlet/validateuseridservlet"),             onsuccesslistener,             onfailurelistener) {          @override         public void setparams(map<string, string> params) {             params.put("userid","mbltest6");             params.put("mobilesaveuserid","false");             params.put("deviceprint","android");         }      };      networkvolley.getinstance().sendrequest(request); 

turns out, needed capitalize parameter "userid" not "userid". keep close eye on parameters people!