Slide 13.7: CGI security concerns
  Slide 13.9: Database accessing embedded in Java host language (JDBC)
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How to Construct My Memento (Cont.)
  1. Calling a CGI Script (Perl) (Cont.)
     Oracle listeners
    Note that the following command is not supposed to work on the shell.aero.und.edu or stewie.aero.und.edu machine: 
       system ("/usr/bin/java  ListItems");
    It is because the Oracle9i resides on the server with an IP address 172.20.2.253. However, JDBC but not SQL*Plus is now working on the shell and stewie because of the Oracle listeners, maybe.

    The Oracle listener is a process that resides on the server whose responsibility is to listen for incoming client connection requests and manage the traffic to the server. When a client requests a network session with a database server, a listener receives the actual request. If the client information matches the listener information, then the listener grants a connection to the database server.