<!doctype html>
<html lang="en" data-ng-app="springIntro">
    <head>
        <title>Spring intro</title>

        <link rel="stylesheet" href="css/bootstrap/bootstrap.min.css"/>
        <link rel="stylesheet" href="css/stylesheet.css"/>

        <script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
        <script type="text/javascript" src="js/lib/angular/angular.js"></script>
    </head>
    <body>
        <!-- <div navbar></div> -->
        <div data-ng-view></div>

        <script type="text/javascript" src="js/lib/angular/angular-resource.min.js"></script>
        <script type="text/javascript" src="js/lib/angular/angular-route.min.js"></script>

        <script type="text/javascript" src="js/lib/bootstrap/bootstrap.min.js"></script>

        <script type="text/javascript" src="js/app.js"></script>
        <script type="text/javascript" src="js/controllers/ProductController.js"></script>
        <script type="text/javascript" src="js/controllers/UserController.js"></script>
        <script type="text/javascript" src="js/services/UserServices.js"></script>
        <script type="text/javascript" src="js/services/ProductServices.js"></script>

        <!-- <script type="text/javascript" src="js/directives/navbar.js"></script> -->
    </body>
</html>

<!doctype html>
<html lang="en" data-ng-app="springIntro">
    <head>
        <title>Spring intro</title>

        <link rel="stylesheet" href="css/bootstrap/bootstrap.min.css"/>
        <link rel="stylesheet" href="css/stylesheet.css"/>

        <script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
        <script type="text/javascript" src="js/lib/angular/angular.min.js"></script>
    </head>
    <body>
        <!-- <div navbar></div> -->
        <div data-ng-view></div>

        <script type="text/javascript" src="js/lib/angular/angular-resource.min.js"></script>
        <script type="text/javascript" src="js/lib/angular/angular-route.min.js"></script>

        <script type="text/javascript" src="js/lib/bootstrap/bootstrap.min.js"></script>

        <script type="text/javascript" src="js/app.js"></script>
        <script type="text/javascript" src="js/controllers/ProductController.js"></script>
        <script type="text/javascript" src="js/controllers/UserController.js"></script>
        <script type="text/javascript" src="js/services/UserServices.js"></script>
        <script type="text/javascript" src="js/services/ProductServices.js"></script>

        <!-- <script type="text/javascript" src="js/directives/navbar.js"></script> -->
    </body>
</html>

Use the minified AngularJS library
Use the minified AngularJS library