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Articles : Advanced Topics in Java :
Bi-Directional Communication in Distributed Remote Objects :

Contents
Introduction to Remote Method Invocation
The Problem Definition
Creating the Remote Interface
Implementing the Interfaces
The Server Starter
The Client Starter
Running the Application

Generating skeletons and stubs

Skeletons and stubs form the client side and server side proxy by which the object state is accessed via the remote reference layer in the RMI protocol. To generate them for our remote objects run rmic on the ServerPopupImpl and ClientPopupImpl, e.g. rmic ServerPopupImpl. This will generate the files:

  • PopupClientImpl_Skel.class
  • PopupClientImpl_Stub.class
  • PopupClientImpl_Skel.class
  • PopupClientImpl_Stub.class

Running the application

Start the server using java ServerStarter, and access the applets through Appletviewer or HotJava. There is also a bat file for Windows users.

Applets do not have the permissions to start the registry in the browser. An AppletSecurity Exception will be thrown by the applet security manager. To use these applets with Netscape you will have to make a digitally signed jar file, incorporate the Netscape security API, and override the methods to give the applet relevant permissions.

References:

  1. RMI Specifications (Sun Microsystems Ltd,1997)
  2. Java 1.1 Developers Guide ( Jamie Jaworski, Indian Edition.1998)
  3. Core Java 1.1 (Cay Horstmann & Gary Cornell )


Sameer Tyagi is a Software Engineer with several years of programming experience in iNet application development and has conducted multiple training workshops in Java. Besides holding an Engineering degree in Electronics he is a Sun Certified Java 1.1 Programmer.
Email: sameertyagi@usa.net

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