java - parameters are not passed in jsp -


i'm developing breadcrumb on website, use following code in jsp:

<form action="envelope">                 <input type="hidden" id="id" name="id" value="">                 <input type="hidden" name="q" value="${fn:escapexml(param.q)}">                 <button type="submit" id="back" class="btn btn-sm btn-primary">                     <span class="fa fa-chevron-left"></span>                 </button>                 <ol class="breadcrumb">                   <li id="file"><a href="envelope.jsp?id=${envlev0}">file</a></li>                   <li id="format"><a href="envelope.jsp?id=${envlev1}">format</a></li>                   <li id="batch"><a href="envelope.jsp?id=${envlev2}">batch</a></li>                   <li id="payment" class="active">payment</li>                 </ol>             </form>

i use following code resolve parameters in detailscontrollerservlet:

 @override     public void service(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {         string index = request.getparameter(field_index);         string type = request.getparameter(field_type);         string id = request.getparameter(field_id);          map<string, object> map = searchdetails(index, id);         (map.entry<string, object> entry : map.entryset()) {             string key = entry.getkey();             object value = entry.getvalue();             if(field_business_data.equals(key)) {                 value = xml_utils.tohtml((string)value);             }             request.setattribute(key, value);             if(logger.isdebugenabled()) {                 logger.debug("added '" + key + "'='" + value + "' request.");             }         }         request.setattribute(field_index, index);         request.setattribute(field_id, id);           string detailspage;         switch (type) {             case "fileenvelope":             case "formatenvelope":             case "batchenvelope":                 detailspage = envelope_jsp;                 break;             case "payment":                 detailspage = payment_jsp;                 request.setattribute("envlev0", 1);                 request.setattribute("envlev1", 2);                 request.setattribute("envlev2", 3);                  break;             default:                 detailspage = details_jsp;         }         getservletcontext().getrequestdispatcher(detailspage).forward(request, response);     }

when choose payment type,i'm navigated payment screen, id resolved, envelope levels not. going wrong?

i think problem lies in detailspage. using request.getparameter() or request.getattribute(). should using later.


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