Creation of a context listener in a web project

Hello.
We need to create a custom context within a web application.
In other projects what we do is create an implementation of the class javax.servlet.ServletContextListener, and reference it as a listener in the web.xml. This alows us to create threads within the container of the server, for instance.
The problem is that after I create the web project in my developer studio 7.2 the class javax.servlet.ServletContextListener is not found within the classpath, that is referencing a Java CE 7.2 server.
The project I created received the SAP Java EE 5 Library, but the class is not present in that.
Is there another library from SAP I need to add? If I import that class from another jar, will it be well supported by the server?
Thanks!

I found the solution, that was only related to problems on my classpth. Thanks!

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Creation of a context listener in a web project

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