How to send JSON data to a java function from angularJS

I have a json like

var rules=[
        {
            "ruleId": "1234",
            "version": "R1234",
            "name": "Usage crossing 50MB",
            "description": "Find usage more than 50mb",
            "active": true,
            "created_by": "Rahul",
            "create_date": "2015-08-18",
            "modified_date": "2015-08-22",
            "modified_by": "Subho",
            "category": {
                "name": "High Usages Rule",
                "id": "26"
            }
]

Now I want to call a java page or function where i want to get these data so i put it on DB.

this is my controller

 (function(){
     "use strict";

  angular
    .module("RulesEngine")
    .controller("RulesEditCtrl",
    ["rules","$state",RulesEditCtrl]);

  function RulesEditCtrl(rules, $state){
    var vm=this;
    vm.rules=rules;

    vm.submit=function(){
        vm.rules.$save(function (data) {
            toastr.success("Save Successful");
            vm.ruleJson=data;
        });
        console.log(vm.ruleJson);
        //in yhis vm.ruleJSON holds the the updated json. it prints fine in console.log
    }
}

}());

I want to call a function using $ajax or $http.get() to call a function insertEntry() which is in a java page named ShowJson.java. please help me to call the function and send the data. I tried

$.ajax({
            url : "insertEntry?rule="+vm.ruleJson,
            type: 'POST',
            dataType : "json",
            success : function(data) {
                console.log("inserted");
            },error : function(data) {
            }
        });

But its not working...