J2EE - Web.xml - How do I define an environment variable that can be accessed in all servlets in a Web application ?

Java Conceptuel Diagram


A J2EE application may require one or more initialization parameters to be accessed by one or more servlets in a web application.


An initialization parameter be for a context or for a specific servlet. The context level parameters can be accessed by any servlets in the web application.

Definition of a context parameter

To define a context parameter you have to add in the following in the web.xml as follows:


Using the context.getInitParameter method

You have to use context.getInitParameter method to get the Context level parameter as in the following code:

javax.servlet.ServletContext context = getServletContext();
String fileDir = context.getInitParameter("filedir"); 

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