<div>
It means we can create a hashmap at global level and store all users which are accessing our application.<br />
based on the size of the map we can find out the current users at a given time.<br />
Am i correct?
</div>


It means we can create a hashmap at global level and store all users which are accessing our application.
based on the size of the map we can find out the current users at a given time.
Am i correct?

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Is there any difference between using listener and filter?
</div>


Is there any difference between using listener and filter?

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Yes. A Filter doesn't listen to session events.
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Yes. A Filter doesn't listen to session events.

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<div class="content wysiwyg-content">
Hi,<br />
I have a web application in java written in jsp,spring running on tomcat 7.<br />
<br />
<u>I don't want to hit the database for the achieving the below.</u><br />
How can i come to know how many users are accessing the application at the particular time through JSP?
</div>
</div>


Hi,
I have a web application in java written in jsp,spring running on tomcat 7.

I don't want to hit the database for the achieving the below.
How can i come to know how many users are accessing the application at the particular time through JSP?

users are accessing the application at the particular time

Java Enterprise Edition (Java EE) is a specification defining a collection of Java-based server and client technologies and how they interoperate. Java EE specifies server and client architectures and uses profiles to define technology sets targeted at specific classes of applications. All Java EE profiles share a set of common features, such as naming and resource injection, packaging rules and security requirements.

Java EE

JavaServer Pages (JSP) allow the development of dynamically generated web pages. It uses the Java programming language; JSP pages are translated into servlets at runtime, with each servlet being cached and reused until the JSP is modified. JSP allows Java code to be interleaved with static web markup content, so the resulting page can be compiled and executed on the server to deliver the content.

An application server is a software framework that provides both facilities to create applications and a server environment to run them. Most application server frameworks contain a comprehensive service layer model, acting as a set of components accessible to the software developer through an API defined by the platform itself. For Web applications, these components are usually performed in the same running environment as their web server(s), and their main job is to support the construction of dynamic pages. However, many application servers target much more than just Web page generation: they implement services like clustering, fail-over, and load-balancing.