A simple example of a Java-RMI setup using Maven
A simple example of a Java-RMI setup using Maven. Project Setup. There are three subprojects in this example. Run the rmiregistry program. Creating a Simple EJB Session Bean with Netbeans. Java Netbeans program assignments. Write a simple random name generator. A very simple and quick introduction to the NetBeans IDE workflow by walking you through the creation of a simple Hello World Java.
Project Setup
Simple Rmi Program Using Netbeans To Groups
There are three subprojects in this example: RMIClient, RMIServer, and RMIInterfaces. These should be self-explanatory. The server sets up a basic class to be used as a remote object. The client then connects to it. Since both the client and the server need to be able to know the definition of the interface, that is broken out into a separate project that they both have as a dependency.
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This project should build out of the box with Maven.
Running the project
Running this can be a somewhat involved task, but here's the simple way to do it:
- Run the rmiregistry program. This should be in $JAVA_HOME/bin.
rmiregistry -J-Djava.rmi.server.useCodebaseOnly=false - Run the RMIServer. Make sure that when setting the RMI server codebase, the path ends with a /, otherwise it will not work.
java -Djava.rmi.server.useCodebaseOnly=false -Djava.rmi.server.codebase=file:C:pathtoclasses com.rm5248.rmiserver.RMIServerMain - Run the RMIClient. Make sure that when setting the RMI server codebase, the path ends with a /, otherwise it will not work. Also ensure that client.policy is accessible by the application.
java -Djava.rmi.server.useCodebaseOnly=false -Djava.rmi.server.codebase=file:C:pathtoclasses -Djava.security.policy=client.policy com.rm5248.rmiclient.RMIClientMain
Rmi Program Using Java
Everything should now come up and you should see a message in the server window. The client prints out the number of characters that it sent to the server.
Other Notes
If you improve this example in any way, feel free to send a pull request.
I am trying to make a very simple chat program using RMI (no GUI's) but i am struggling for ideas.How do i register clients when they connect to the server?When i use
RemoteServer.getClientHost()
all this does is show the ip address (and they are the same for all clients that connect from the same computer (from multiple command windows).What i am trying to implement is this: when a client logs on he is shown a switch-case menu and ift they press
they get a list of connected clients.
sendMessage(client, String)
But i do not know how to identify individual clients?
And when i do, how do i show a string only on that client's window ? Cea ordenadores crack gratis.
Thanks,
Research:(i have looked at ideas on the web but a lot of them are more advanced than i want. This is a simple application and i do not want to complicate it / copy code i dont understand).There are previous questions on SO but with 0/1 answers (not very popular topic!) or not helpful!
1 Answer
Looks like i found what i was looking for:
RMI Callback
Basically making every client a server, so the server can respond as well as receive messages.
I have been directed to a resource that might help: