Putting properties in the web xml file

January 25, 2011

If you are building a web app in Java or Scala, you might want to feed in a variable from outside which describes something special about the particular environment the web app is running on.  On a normal application you might do this from the command line with a command line argument.  In a web app, you put the variables in the web.xml file. In a maven built project this can be found in /src/main/java/webapp/WEB-INF/web.xml

The XML for the variable looks like this …


In your code, the property can be accessed by any class which extends HttpServlet. The following imports are therefore required:

import javax.servlet.http.HttpServlet;
import javax.naming.Context;
import javax.naming.InitialContext;

The property can then be accessed in your Java code like this:

Context env = (Context) (new InitialContext().lookup("java:comp/env"));
String PROPS_FOLDER = (String) env.lookup("PROPS_FOLDER");

And in Scala like this:

val env:Context = (new InitialContext().lookup("java:comp/env")).asInstanceOf[Context];
val PROPS_FOLDER:String = env.lookup("PROPS_FOLDER").asInstanceOf[String];

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