I tried with following code to include my custom js file using require js 

```
require.config({
    waitSeconds: 0,
    paths: {
       underscore: 'underscore/underscore',
       backbone: "backbone/backbone-min",
        jquery: "jquery/jquery-min",
        customhandler: "jquery/customhandler"
    },
    shim: {
         underscore: {
           deps: ['underscore'],
           exports: '_'
        }
    }
});

```

Created separate file `customhandler.js` and inside i want to use backbone,jquery,underscore

```
define(['jquery','underscore','backbone'], function($,_,Backbone) {
    //using jquery
    var oldAjax = $.ajax;

    $.ajax = function(options) {
        console.log(options)
         // Do your magic.
         return oldAjax.apply($, arguments);

    }
    //need to use backbone,underscore here
});

```

But still i could not get it loaded into my application.Please advise.