java - Convert String to Int with Integer.parseInt don't works -

i'm working javaee need convert this: request.getparameter("id") int. value of request.getparameter("id") "9" (string). when i'm trying convert int have

java.lang.numberformatexception

i've tried java.lang.integer.parseint(request.getparameter("id")) , request.getparameter("id",10) donsen't works...

any solutions? thank you.

a complete full proof code be

    string idstring = request.getparameter("id");     if(idstring != null) {         try {             system.out.println(idstring.trim()); // print verify             int idint = integer.parseint(idstring.trim());         }         catch(numberformatexception nbe) {             nbe.printstacktrace();         }     }