Didn't getting any requests from jQuery ajax to JAVA RESTful webservice

Please help me to solve this serious issue...

My web application is developed using 'html, javascript and css' for front-end & back-end with RESTful webservice in JAVA.

Front-end is deployed in Apache2 server & back-end in JBOSS 7 server. Currently the communication between front-end & back-end is not possible via jQuery ajax. There is not showing any error messages too..! But didn't getting any request calls to the JBOSS server from the Apache server. I used 'application/json' as contentType. Here adding the code which I used...

$.ajax({

url : URL,
type : 'POST',
headers : {
            "ACCEPT" : "application/json"
      },
contentType : "application/json; charset=utf-8",
crossDomain : true,
data : request,
dataType : 'json',

success : function(response){

          //my code
   },                                   
  error : function(xhr, status, error) {
          //my code
   }
 });

Hope you peoples will help me.

Thanks in advance..