Question about dynamic downloading.....please

[Ken Kirin]

Hi all,

I almost finished the assignment but I want to make sure I understand some of the assignment requirement correctly. My question is about the dynamic downloading. The assignment stated that

You must provide all classes pre-installed so that no dynamic downloading occurs

I decided to start RMI registry programmactically.A remote implementation class is trying to create the RMI registry, if it already existed, just get it

 
      String portNumber = properties.getProperty("server_port_number");
      if(portNumber == null) {
            portNumber = "1099"; // default port number.
      }
      Registry reg = null;
      try {
            reg = LocateRegistry.createRegistry(Integer.parseInt(portNumber));
      }
      catch(RemoteException ex) {
           reg = LocateRegistry.getRegistry(Integer.parseInt(portNumber));
      }
      RemoteDataManagerProxy remoteDataManager = new RemoteDataManagerProxy("network");
      reg.rebind("RemoteDataManager", remoteDataManager); 

My RemoteDataAccessFactory class at the client-side will try to get this remote object from

 
      String ip = properties.getProperty("network_ip_address");
      String portnumber = properties.getProperty("network_port_number");
      Object obj = Naming.lookup("rmi://" + ip + ":"+portnumber+
                                         "/RemoteDataManager");
      DataManager dataManager = (DataManager)obj;
      return dataManager;

So

I didn't start RMI registry using rmiregistry <port_number> command line.

I compiled my source code without using the codebase property ( -Djava.rmi.server.codebase <URL> ) , since this is the case that the dynamic loading might be allowed.

I run the test, everything is fine . In my sample client package I need to pack the remote stub into the client package, the remote implementation class could be eliminated. This protects the dynamic loading feature from the client-side. Am I understanding this correctly and still following the requirement?

Thank you inadvance

Ken Kirin
SCJP
SWCD
SCJD(B&S 2.2.1 In progress)

[Ken Kirin]

Hi all,

It's me agian. Please forget what I talked about compiling the sourcecode actually I would mean running the server without the codebase property
so I just run my server
java suncerity.gui.ApplicationLoader server
or should I better run it with this option
java -Djava.rmi.server.codebase <URL> ................ server

Thank you
Ken Kirin.

[Bridget Kennedy]

Just passed the SCJD and decided to answer at least one post.

I believe you would be in violation of the instructions if you use the -D command line option. My instructions (and everyone else's based on what I've seen on this forum) say:
"When you submit your assignment, each part (client and server) must be executable using a command of this exact form:

java -jar <path_and_filename> [<mode>]"

Further, your invocation line will not contain your main class name as noted in your example. Again, from the instructions:

"The executable JAR containing the programs. This must be called runme.jar"

[Ken Kirin]

Hi Bridget,

Now I got it. Thank you very much

Regards,
Ken Kirin
SCJP
SWCD
SCJD(B&S 2.2.1 In progress)

[David Abramowicz]

Hi!

You were also wise not to force the user to start the RMI Registry manually.

Word of warning to you all, a colleague of mine failed the assignment due to not starting the RMI registry progamatically.


/Dave