	CS 696 Emerging Technologies: Java Distributed Computing Spring Semester, 1999 Activation & rohan
	Previous Lecture Notes Index Next © 1999, All Rights Reserved, SDSU & Roger Whitney San Diego State University -- This page last updated 11-Mar-99

Contents of Doc 14, Activation & rohan

References

rmid & Port Number

References

Java Remote Method Invocation Specification, chapter 7 & pp. 122

Local HTML Copy: http://www-rohan.sdsu.edu/java/jdk1.2/docs/guide/rmi/spec/rmiTOC.doc.html
Sun HTML Site: http://java.sun.com/products/jdk/1.2/docs/guide/rmi/spec/rmiTOC.doc.html

rmid documentation

Sun Copy: http://java.sun.com/products/jdk/1.2/docs/tooldocs/solaris/rmid.html

Private communication & rmi mailing list


Doc 14, Activation & rohan Slide # 2

rmid & Port Number

Server Side
How does your Server registration program find rmid if it is not on the standard port?

Solution 1 Set the system property java.rmi.activation.port in the JVM what registers the server


Doc 14, Activation & rohan Slide # 3

Solution 2 Use the rmid registry

package whitney.rmi.examples.activation;
import java.rmi.*;
import java.rmi.activation.*;
import java.util.Properties;
public class RegisterHelloServer 
   {
   public static void main(String[] args) throws Exception 
      {
      System.setSecurityManager(new RMISecurityManager());
      Properties policyFileLocation = new Properties(); 
      policyFileLocation.put("java.security.policy", 
         "/export/home/whitney/.java.policy");
      ActivationGroupDesc.CommandEnvironment ace = null; 
      ActivationGroupDesc exampleGroup = 
         new ActivationGroupDesc(policyFileLocation, ace);
 
       ActivationSystem localActivationSystem;
       localActivationSystem = (ActivationSystem)
           Naming.lookup("//:6753/java.rmi.activation.ActivationSystem");
      ActivationGroupID agi = 
         localActivationSystem.registerGroup(exampleGroup);
Doc 14, Activation & rohan Slide # 4

RegisterHelloServer Continued

      System.out.println( "after register group" );
      ActivationGroup.createGroup(agi, exampleGroup, 0);
      String classLocation = "file:/export/home/whitney/java/classes/";
      String serverClass = 
         "whitney.rmi.examples.activation.HelloServer";
      MarshalledObject data = null;
      ActivationDesc desc = 
         new ActivationDesc(serverClass, classLocation, data);
      
      Hello mri = (Hello)Activatable.register(desc);
      System.out.println("Got the stub for the HelloServer");
         
      Naming.rebind("//:6754/HelloServer", mri);
      System.out.println("Exported HelloServer");
      System.exit(0);
      }
   }
Doc 14, Activation & rohan Slide # 5

rmid & Port NumberClient Side
The hostname and port number of rmid is part of the stub downloaded to the client when it contacts the rmiregistry.

rmid is responsible for setting this information in the stub

On rohan this information is not set correctly.

You can use the –C-D and –J-D flags to set the correct value.

rmid -C-Djava.rmi.server.hostname=rohan.sdsu.edu -J-Djava .rmi.server.hostname=rohan.sdsu.edu -port 6753 &

However, there is still a problem on rohan.

At this time on rohan or moria

Do not use the above flags
Do not test your clients remotely on servers implementing the Activatable interface

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