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Java RMI Programming Steps and Instructions

Learn how to code and deploy Java RMI applications with step-by-step instructions. Includes interface definition, server and client implementation, compilation, deployment, and execution.

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Java RMI Programming Steps and Instructions

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  1. CS 584 Lecture 18 • Assignment • Glenda assignment extended to the Java RMI Deadline • No Java RMI Assignment • Test • Friday, Saturday, Monday

  2. Java RMI

  3. RMI Programming Steps • Coding the source files • Compilation and Deployment • Running

  4. Coding the Source Files • There are at least 3 source files • Interface definition • Server Implementation • Client Implementation • HTML file if applet

  5. Interface Definition • Interface must be public • Extends java.rmi.Remote • Must declare java.rmi.RemoteException in throws clause

  6. Interface Definition Example package examples.hello public interface Hello extends java.rmi.Remote { String sayHello() throws java.rmi.RemoteException; }

  7. Server Implementation • Specifies the remote interface • Defines the constructor • Implements methods • Creates and Installs a security manager • Creates instances of the remote object • Registers the remote object with the RMI remote object registry

  8. Server Implementation package examples.hello import java.rmi.*; import java.rmi.server.UnicastRemoteObject public class HelloImpl extends UnicastRemoteObject implements Hello { private String name;

  9. Server Implementation public HelloImpl(String s) throws RemoteException { super(); name = s; } public String sayHello() throws RemoteException { return "Hello World"; }

  10. Server Implementation public static void main(String[] args) { System.setSecurityManager(new RMISecurityManager()); try { HelloImpl obj = new HelloImpl("HelloServer"); Naming.rebind("//myhost/HelloServer", obj); System.out.println("Hello Server bound"); catch(Exception e) { System.out.println("Err: " + e.getMessage); e.printStackTrace(); } }

  11. Client Implementation • Obtain a reference to the "HelloServer" from the server's registry • Invoke the method on the remote object • Use the returned results

  12. Client Implementation package examples.hello import java.awt.*; import java.rmi.*; public class HelloApplet extends java.applet.Applet { String message = " ";

  13. Client Implementation public void init() { try { Hello obj = (Hello)Naming.lookup("//" + getCodeBase().getHost() + "/HelloServer"); message = obj.sayHello(); } catch (Exception e) { System.out.println("Err: " + e.getMessage); e.printStackTrace(); } }

  14. Client Implementation public void paint(Graphics g) { g.drawString(message, 25,50); }

  15. Compilation • Compile the source files using javac • Generate Stub and Skeleton files • client side and server side proxies • generated using rmic on class files

  16. Deployment • RMI is based on packages • RMI objects need to be in a visible place

  17. Execution • Start the registry on the server • start rmiregistry • Start the server using the java interpreter • Run the applet

  18. For More Information • See Sun's website for a tutorial • web3.javasoft.com:80/products/jdk/1.1/docs/guide/rmi/getstart.doc.html • Remember the test!!!!!

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