dhavaln/Application.java

## Application.java

    public static void facebookLogin() {
        try {
            JsonObject profile = FbGraph.getObject("me"); // fetch the logged in user
            String email = profile.get("email").getAsString(); // retrieve the email
            System.out.println("facebook user " + email);
            // do useful things
            Session.current().put("username", email); // put the email into the session (for the Secure module)
        } catch (FbGraphException fbge) {
            flash.error(fbge.getMessage());
            if (fbge.getType() != null && fbge.getType().equals("OAuthException")) {
                Session.current().remove("username");
            }
        }
        redirect("/");
    }

## index.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html xmlns:fb="http://ogp.me/ns/fb#">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
	<script type="text/javascript">

	</script>
</head>
<body>
	<div id="fb-root"></div>
	<script>

	window.fbAsyncInit = function() {
	  	console.log("init is done");

	  	FB.getLoginStatus(function(response){
	  		console.log(response);
	  	});
      // Additional initialization code here
	  FB.Event.subscribe('auth.authResponseChange', function(response) {
		  alert('The status of the session is: ' + response.status);
	  });

	  FB.Event.subscribe('auth.login', function(response) {
		  alert('user is logged in: ' );
	  });
    };

	(function(d, s, id) {
	  var js, fjs = d.getElementsByTagName(s)[0];
	  if (d.getElementById(id)) return;
	  js = d.createElement(s); js.id = id;
	  js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&appId=220999597976156";
	  fjs.parentNode.insertBefore(js, fjs);
	}(document, 'script', 'facebook-jssdk'));</script>


	<fb:login-button scope="email" onlogin="facebookLogin();"></fb:login-button>

	<script type="text/javascript">
    function facebookLogin() {
        // get current login status from facebook.com
        FB.getLoginStatus(function(response) {
        	console.log(response);
        	if (response.authResponse) {
                // logged in and connected user, someone you know
                window.location = "@{Application.facebookLogin()}";
            } else {
                //window.location = "@{Secure.logout()}";
            }
        });

        FB.Event.subscribe('auth.login', function(response) {
        	  // do something with response
        	  console.log("auth logged in ");
        });
    }
</script>
</body>
</html>

	public static void facebookLogin() {
	try {
	JsonObject profile = FbGraph.getObject("me"); // fetch the logged in user
	String email = profile.get("email").getAsString(); // retrieve the email
	System.out.println("facebook user " + email);
	// do useful things
	Session.current().put("username", email); // put the email into the session (for the Secure module)
	} catch (FbGraphException fbge) {
	flash.error(fbge.getMessage());
	if (fbge.getType() != null && fbge.getType().equals("OAuthException")) {
	Session.current().remove("username");
	}
	}
	redirect("/");
	}
	<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

	<html xmlns:fb="http://ogp.me/ns/fb#">
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
	<title>Insert title here</title>
	<script type="text/javascript">

	</script>
	</head>
	<body>
	<div id="fb-root"></div>
	<script>

	window.fbAsyncInit = function() {
	console.log("init is done");

	FB.getLoginStatus(function(response){
	console.log(response);
	});
	// Additional initialization code here
	FB.Event.subscribe('auth.authResponseChange', function(response) {
	alert('The status of the session is: ' + response.status);
	});

	FB.Event.subscribe('auth.login', function(response) {
	alert('user is logged in: ' );
	});
	};

	(function(d, s, id) {
	var js, fjs = d.getElementsByTagName(s)[0];
	if (d.getElementById(id)) return;
	js = d.createElement(s); js.id = id;
	js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&appId=220999597976156";
	fjs.parentNode.insertBefore(js, fjs);
	}(document, 'script', 'facebook-jssdk'));</script>


	<fb:login-button scope="email" onlogin="facebookLogin();"></fb:login-button>

	<script type="text/javascript">
	function facebookLogin() {
	// get current login status from facebook.com
	FB.getLoginStatus(function(response) {
	console.log(response);
	if (response.authResponse) {
	// logged in and connected user, someone you know
	window.location = "@{Application.facebookLogin()}";
	} else {
	//window.location = "@{Secure.logout()}";
	}
	});

	FB.Event.subscribe('auth.login', function(response) {
	// do something with response
	console.log("auth logged in ");
	});
	}
	</script>
	</body>
	</html>