jquery - How to return JSON data from servlet and get that from the success call back function of ajax call -

i trying return json data servlet , access data success call function of ajax call. here js code:

$(document).ready(function() {     $("#submit").on("click", function()     {         userid = $("#usernametxt").val();         seqans = $("#seqanstxt").val();         seqques = $("#seqques").val();         command = $("#_cmd").val()         $.ajax({             type : "post",             datatype : "json",             url : "/inventory/invcontroller",             data : {_cmd : command, uid : userid, ques : seqques, ans : seqans},             success : function(retval)             {                 if(true)                 {                     $("#resetpwd").show();                 }             },             error: function(error)             {                 console.log(error);             }         });     }); }); 

here serrvlet code:

boolean issuccess = loghelper.performforgotpwdvalidation(agentdetails);     printwriter out = null;     jsonobject jsonobj = new jsonobject();     try      {         jsonobj.addproperty("isvalid", issuccess);         response.setcontenttype( "application/json" );         response.setcharacterencoding("utf-8");         out = response.getwriter();         out.write(jsonobj.tostring());         out.flush();     }      catch (ioexception e)      {         e.printstacktrace();     }         {         if( null != out )         {             out.close();         }     } 

i trying return "issuccess" json data. how should return that. please let me know how return data in success call function of ajax call.

thanks in advance.