Dynamic stub downloading question.

It turned out that I've been killing time over and over again when setting up dynamic stubs downloading for RMI implementations.
Wouldn't be it simple if RMI isolates developer from all those steps by
a) creating stubs on the fly when the remote object gets bound and
b) upload them to the client as a part of Naming.lookup() call?
No need to rmic, http-/ftp-/file--server, additional security, etc. Can somebody explain me this or I am missing something here??
Thanks.

It turned out that I've been killing time No, you havent been killing time.
over and
over again when setting up dynamic stubs downloading
for RMI implementations.
Wouldn't be it simple if RMI isolates developer from
all those steps by
a) creating stubs on the fly when the remote object
gets boundDo you know what this will ultimately mean? It means that some PROCESS, either the registry or something else, will NEED TO LOOK AT THE OBJECT THAT IT HAS ACCEPTED TO BE BOUND, OR IS JUST ABOUT TO ACCEPT TO BE BOUND and then check to see if it REALLY does extend the proper superclasses (UnicastRemoteObject for plain RMI, or PortableRemoteObject for all those RMI-IIOP lovers out there), THEN check if the service object REALLY DOES implement the remote interface TO THE LETTER, ........THEN check to see if the proper exceptions are going to be thrown if something goes wrong!!
(i'm panting right now.....)
That's simply madness. Do you have any idea how often an object can be:
1: Bound to the registry
2. REBOUND under a different name
3. Removed and later REBOUND
?????? Its sick. The JVM/registry overhead will hit the roof!!!
ok, lets go on....
and
b) upload them to the client as a part of
Naming.lookup() call?What?? IS IT FOR THE CLIENT TO TRY AND CONNECT TO THE SERVER USING STUBS IT ALREADY HAS .......or is it for the server to somehow keep TABS on its client and SEND the stubs to it, just so it can talk to the server???????
Doesnt make sense at all.
>
No need to rmic, http-/ftp-/file--server, additional
security, etc. Can somebody explain me this or I am
missing something here?Oh, buddy: you ARE missing something.

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Hi RMI Specialists,
I am experiencing a possible dynamic class loading issue when attempting to separate the client & server codes across 2 separate Windows (XP & 2000) systems. This exercise (from ch13 of Oreilly�s Learning Java) is made up
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On the Server side:
package LearningJavaServer;
import java.rmi.*;
import java.util.*;
public interface RemoteServer extends Remote {
    Date getDate( ) throws RemoteException;
    Object execute( WorkRequest work ) throws RemoteException;
package LearningJavaServer;
import java.rmi.*;
import java.util.*;
public class MyServer extends java.rmi.server.UnicastRemoteObject
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    public Object execute( WorkRequest work ) throws RemoteException {
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        } catch (java.io.IOException e) {
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package LearningJavaServer;
import java.io.*;
public class Request implements java.io.Serializable {}
package LearningJavaServer;
public abstract class WorkRequest extends Request {
    public abstract Object execute( );
}On the Client side:
package LearningJavaClient;
import java.rmi.*;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class MyClient {
    public static void main(String [] args)
      throws RemoteException {
        new MyClient( args[0] );
    public MyClient(String host) {
        try {
            RemoteServer server = (RemoteServer)
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            System.out.println( server.getDate( ) );
            System.out.println(
              server.execute( new MyCalculation(2) ) );
        } catch (java.io.IOException e) {
              // I/O Error or bad URL
                 System.out.println( e );
        } catch (NotBoundException e) {
              // NiftyServer isn't registered
           System.out.println( e );
package LearningJavaClient;
import java.rmi.*;
import java.util.*;
public interface RemoteServer extends Remote {
    Date getDate( ) throws RemoteException;
    Object execute( WorkRequest work ) throws RemoteException;
package LearningJavaClient;
public class MyCalculation extends WorkRequest {
    int n;
    public MyCalculation( int n ) {
        this.n = n;
    public Object execute( ) {
        return new Integer( n * n );
package LearningJavaClient;
import java.io.*;
public class Request implements java.io.Serializable {}
package LearningJavaClient;
public abstract class WorkRequest extends Request {
    public abstract Object execute( );
}Steps to invoke all services on the server side:
cd C:\Documents and Settings\htran\JavaRMI\build\classes on both systems;
( i ) start rmiregistry.
( ii ) java -Djava.rmi.server.codebase='http://serverhostname/LearningJavaServer/' -Djava.security.policy="C:\Documents and Settings\htran\.java.policy" -cp . LearningJavaServer.MyServer
Steps to invoke all services on the client side:
( i ) java -Djava.security.policy="C:\Documents and Settings\htran\.java.policy" -cp . LearningJavaClient.MyClient serverhostname
java.rmi.NotBoundException: NiftyServer
Or
( ii ) java -Djava.rmi.server.codebase='http://clienthostname/LearningJavaClient/' -Djava.security.policy="C:\Documents and Settings\htran\.java.policy" -cp . LearningJavaClient.MyClient serverhostname
java.rmi.UnmarshalException: Error unmarshaling return; nested exception is:
java.net.MalformedURLException: no protocol: 'http://clienthostname/LearningJavaClient/'
Is it possible that this issue could have been caused by either the Request/WorkRequest classes which are present on both system? Likewise, is the location of invoking RMI registry on the server correct?
Both systems have got their own web servers (http://serverhostname/LearningJavaServer & http://clienthostname/LearningJavaClient).
No firewalls between the two systems and the security files (C:\Document Settings\htran\.java.policy) are made up of the following 2 lines:
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C:\Documents and Settings\htran\JavaRMI\build\classes>java -Djava.rmi.se
rver.codebase='http://clienthostname/LearningJavaClient/' -Djava.security.policy="C:\
Documents and Settings\htran\.java.policy" -cp . LearningJavaClient.MyClient serverhostname
This exercise has worked fine when running all the codes on the same host.
I am running Netbeans 5.5, JDK1.5.0_11 on Windows 2000 (Server) & XP (Client).
Any assistance would be appreciated.
Many thanks,
Henry

Hi Esmond,
You still have an empty catch block for the IOException. Fix that first. I >can't possibly tell what's going on until you can at least bind the >service.OK. MyServer.java below no longer throws RemoteExceptions in both of its methods and added the print stacktrace to catch the empty IOException earlier.
public class MyServer extends java.rmi.server.UnicastRemoteObject
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    public MyServer( ) throws RemoteException { }
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        return new Date( );
    public Object execute( WorkRequest work ) {
        return work.execute( );
    public static void main(String args[]) {
        System.setSecurityManager(new RMISecurityManager());
        try {
            RemoteServer server = new MyServer( );
            Naming.rebind("NiftyServer", server);
        } catch (java.io.IOException e) {
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            e.printStackTrace();
        } catch (Exception e) {
            System.out.println("General Exception from MyServer");
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}The following error messages were produced when launching MyServer.class. I have broken it into 2 separate attempts. One with Dynamic Class Downloading & one without.
Use CodeBase when launches MyServer.
C:\Documents and Settings\abc\JavaRMI\build\classes>java -Djava.rmi.server.codebase='http://clienthostname/LearningJava/' -Djava.security.policy="C:\Documents and
Settings\abc\.java.policy" -cp . LearningJava.MyServer
IOexception from MyServer
java.rmi.UnmarshalException: Error unmarshaling return; nested exception is: java.net.MalformedURLException: no protocol: 'http://clienthostname/LearningJava/'
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at java.rmi.Naming.rebind(Unknown Source)
at LearningJava.MyServer.main(MyServer.java:28)
Caused by: java.net.MalformedURLException: no protocol: 'http://clienthostname/LearningJava/'
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at sun.rmi.server.LoaderHandler.pathToURLs(Unknown Source)
at sun.rmi.server.LoaderHandler.getDefaultCodebaseURLs(Unknown Source)
at sun.rmi.server.LoaderHandler.loadClass(Unknown Source)
at java.rmi.server.RMIClassLoader$2.loadClass(Unknown Source)
at java.rmi.server.RMIClassLoader.loadClass(Unknown Source)
at sun.rmi.server.MarshalInputStream.resolveClass(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
... 5 more
Does NOT use CodeBase when launches MyServer
C:\Documents and Settings\abc\JavaRMI\build\classes>java -Djava.security.policy="C:\Documents and Settings\abc\.java.policy" -cp . LearningJava.MyServer
IOexception from MyServer
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: LearningJava.RemoteServer
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:385)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:240)
at sun.rmi.transport.Transport$1.run(Transport.java:153)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:466)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:707)
at java.lang.Thread.run(Thread.java:595)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at java.rmi.Naming.rebind(Unknown Source)
at LearningJava.MyServer.main(MyServer.java:28)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: LearningJava.RemoteServer
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:375
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:240)
at sun.rmi.transport.Transport$1.run(Transport.java:153)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:466)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:707)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.ClassNotFoundException: LearningJava.RemoteServer
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:707)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:651)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:588)
at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:628)
at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:294
at sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:238)
at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1500)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1463)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1699)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
... 9 more
I now understand that you do want to use dynamic class loading, and >moreover that you want to do it from the client to the server, in which >case you do need java.rmi.server.codebase at the client and you do >also need a codebase server. However the client and server can both >use the same codebase server, and indeed in this situation I don't >see why the server needs a codebase server or setting at all actually. I >don't really see why you want to use it from the client either, if this is a >closed system but that's your problem not mine.I now use only one codebase server. ie the one on the Client side where MyCalculation.class resides. You are right it is not necessary to use codebase when launching MyServer since the Client side does not need to download any additional classes over to the client side. Nevertheless, neither of the above startups (with/without) codebase worked even though the error messages were slightly different.
Btw, can you explain what you mean by a "close system" compared to an "opened system"?
java.net.MalformedURLException: no >protocol: 'http://clienthostname/LearningJava/'
That doesn't make sense. Are you sure you're transcribing it correctly? >Also what line of code is throwing it?Here is the code for MyClient which explains that the line java.net.MalformedURLException: came from line 32, the printStackTrace() from IOException.
public class MyClient {
    public static void main(String [] args)
      throws RemoteException {
      System.setSecurityManager(new RMISecurityManager());
        new MyClient( args[0] );
    public MyClient(String host) {
        try {
            RemoteServer server = (RemoteServer)
                Naming.lookup("rmi://"+host+"/NiftyServer");
            System.out.println( server.getDate( ) );
            System.out.println(
            server.execute( new MyCalculation(2) ) );    // line 28
        } catch (java.io.IOException e) {
              // I/O Error or bad URL
              System.out.println("IOException from MyClient");
           e.printStackTrace();
        } catch (NotBoundException e) {
              // NiftyServer isn't registered
              System.out.println("NotBoundException from MyClient");
           e.printStackTrace();
        } catch (Exception e) {
              System.out.println("General Exception from MyClient");
              e.printStackTrace();
}I wouldn't pay much attention to this message since the MyServer has difficulty registering itself to RMI registry. As a result, MyClient could not
locate MyServer via RemoteServer interface before giving up altogether.
Unfortunately, I have not being able to create an interface (e.g. >MyCalculation.class as an interface, MyCalculationImpl.class as the >actual implementation of MyCalculation) since WorkRequest is an >abstract class, which does not allow MyClient to instanciates >MyCalculation on line 28.
I don't see why not. What error messages/exceptions are you getting?
Are you referring to the execute() method on line 13 in >RemoteServer.classNo, I am referring to line 28 of MyClient.class above after the following failed attempts to create an interface for MyCalculation.java:
public interface MyCalculation extends WorkRequest { // Got a syntax error: interface expected here in Netbeans.
} Or
public interface MyCalculation {}
public class MyCalculation extends WorkRequest extends MyCalculation { ... # Obviously cannot extend more than one class.Any suggestion?
No. I said the remote method implementation (i.e. in your xxxImpl >class) doesn't need to be declared to throw RemoteException. The >remote method definition in the remote interface certainly does. I have taken out the RemoteException from 2 methods in MyServer.java. ie implementation of the RemoteServer.java.
In short, I have used only one codebase server but puzzled whether MyCalculation.class (have split it up into interface & implementation) will be passed over to the
server side by referenced, value or Dynamic Class Downloading. I do not want it to use Dynamic Class Downloading to do this.
Thanks,
Henry

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sorry I thought you were trying to download the stubs
only...
try this:
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5. I went back into Premiere, made the editing changes (mostly increases in volume from audience questions, removing some comments, etc.)
Now... If I try and use Dynamic link again to "re-send" to Encore, my only choice is a new project... I cannot send using Dynamic link to an existing project (or if I can, I do not know how)
I know one work around is to encode from Premiere, then open a Encore project, import as a timeline.... & author away....
This way, If I go back to Premiere, make editing changes, export back out WITH THE SAME FILE NAME.... when I open the existing Encore project... everything is the same... except the timeline has the updated editing changes...
The only problem is that on all 18 DVD's, I used dynamic link to send to Encore... so does that mean, (unless I use a work-around, like stated above), I have to re-author all 18 DVDs. I would think that even when using dynamic link, if you open the timeline again in Premiere, make editing changes, that the Encore project would reflect those changes (to make sure, I set the audio volume to 0 on the first 10 seconds in Premiere, saved the project & closed it, opened Encore, did a preview, the audio was still at the regular volume (no change).....
Any suggestions...
Or should I just once again use dynamic link, start a new Encore project, re-author (& basically do the same thing over)?
Or should I do it the other way, encode from Premiere, (you know the rest), I do believe that all the editing changes have been made (according to the client)
Or, is there some way from Premiere to use Dynamic link to send to an existing Encore project?
David Kelley

I didn't read all your note carefully.
In your previous Encore project for DVD 1 (or whatever), right click on the "asset" for the timeline (the asset for a dynamic link is the Premiere sequece, not the Encore timeline that was created), and pick "revert to original." It should pick up your changes from Premiere.
Note that to update markers, you must select the video in the Encore timeline itself, right click, "update markers from source." You will lose all previous markers. If you created the markers in Encore, you must update manually.

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Environment:
ACS Express 5.0.1
C3550 running c3550-ipbasek9-mz.122-44.SE6.bin
Switch config:
aaa new-model
aaa group server radius dot1x
server-private 10.10.1.4 auth-port 1645 acct-port 1646 key 7 071C244F5C0C0D544541
aaa authentication dot1x default group dot1x
dot1x system-auth-control
dot1x guest-vlan supplicant
interface FastEthernet0/3
switchport access vlan 3
switchport mode access
speed 100
duplex full
dot1x pae authenticator
dot1x port-control auto
dot1x violation-mode protect
dot1x timeout tx-period 5
dot1x timeout supp-timeout 5
spanning-tree portfast
ip radius source-interface FastEthernet0/1 vrf default!
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It looks like "aaa authorization network default group dot1x" was the missing command I needed to get this working.
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Can you dynamically add a column to a data table at run time using JSC and JSF? I have a case where I want to add a column to a table based on a selection by the user.

Hi
I have been trying to this when I saw your question first time two days back. I tried changing the rowset's query but nothing seems to work. I will try again and I am sure that I can give you something on this if there is any straight solution to this.
Thanks
Srinivas

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I've written a servlet that will extract my file from the database and prompt the client browser with a "Save As" prompt. So far so good.
The problem I'm having is that for the file name, the browser is using the name of the servlet (say Example.do" as the file name.
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Pros : The file name will be the correct one.
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Dynamic stub downloading question.

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