How to forward request from web1/servlet to web2/servlet?

Hi,

I have an exact scenario like in this thread: http://stackoverflow.com/questions/4889113/how-to-forward-request-from-web1-servlet-to-web2-servlet.

The code from the thread works for me:

ServletContext web1 = getServletContext();
ServletContext web2 = web1.getContext("/web2");
RequestDispatcher dispatcher = web2.getRequestDispatcher("/servlet2");
dispatcher.forward(request, response);

But I'm wondering: is sharing context between two web applications is the default behavior of the SAP J2EE engine?
If yes, where can I config this behavior?

According to the JavaDoc: (ServletContext interface, getContext method):
http://docs.oracle.com/javaee/5/api/javax/servlet/ServletContext.html#getContext%28java.lang.String%29
"In a security conscious environment, the servlet container may return null for a given URL. "

How do I make my environment "security conscious"?

J2EE server is 7.31 SP7.

Regads,
Omri