First register your application in google analytics.
Your application will be given a unique app id.
Then add the following code in your jsp.
<!-- Google Analytics module-->
<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'app_id']);
_gaq.push(['_trackPageview']);
(function() {
var ga =
document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' ==
document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s =
document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
Note: It will take one or two days to track the number of users in your application.
The moment you deploy the code it will start tracking but it will take a day time to get updated in the Google Analytics site.