Simple RMI question

I have completed reading tutorial...... i have understood How to code in RMI ?
How you can interact with other JVM and call remote methods....basically you need to write code for RMIServer { // it will have interface and classes which implemets those interfaces } and also a RMIClient .
Client will look for rmiregistry and from the naming look up it will find out the remote object and then it calls the remote method.
I have got some question after reading the tutorial
Question 1:
in the binding
// implemented class in RMI server
public class PowerServiceServer extends UnicastRemoteObject
implements PowerService
// blah blah
Naming.bind ("PowerService", svr); // can i give any name instead of the Server name "PowerService" ?
bcoz i saw another tutorial where they have coded like below ....
Naming.bind ("rmi://john/ServerName", svr); // note "rmi :// " ? its different than above. why "rmi://" ? Ho many convention !!so It is misleading to me ......... can i give any name whatever i wish ( may not be SERVER name as well ) for Naming.bind ? like below
Naming.bind ("abcdefghijklmnop", svr); // IS IT LEGAL ?
or is there any convention or standard to follow ?
OR do i need to write the path localtion of my server in that string ?
like below...
Naming.bind ("c:/packagename/RMIServer", svr); ?
Plz correct me
thank you

You can use any name.yea......freedommmmmm............i like.
//host:port/namewell , if i use this convention then it will be like...
//CompName:1099/AnythingULike......right ?
thanks ?kaj i am happy .
I have some more queries.
Question 2 :
If you noticed my earlier post on "Stub and Skeleton" where ceil has given a fantastic explanation of what does this phrase means in programming point of view.
In fact while reading RMI tutorial i came across these two words . But after reading the tutorial it seems to me Author is misusing these 2 words.
see a comment from A CBT . i copied it in a notebook
The server generates the stub and the skeleton. THE STUB resides on the client side and the skeleton on the server. In the recent version the generating skeleton are not required unless compatibality is required.
To Generate stub and skeleton you can follow the command
rmic myserver ( ???)
plz note the statements which starts Capitalized . Its confusing .
THE STUB resides on the client side and the skeleton on the server.No.
Interfaces are there in the server code to make happy the compiler. so those are stubs and skeletons ( group of stubs) in the server.
there is NO STUB in the client side. its wrong.
To Generate stub and skeleton you can follow the command
rmic myserver ( ???)wow ...what is this ? some tutorials dont tell about this at all !!
i read a tutorial where they said the shortcut tips
(compile all source files + start rmiregistry + run server + run client )....thats it !!
tutorials are varryingggggggg.

Similar Messages

Simple/silly question: how do I set/change default font/color for outgoing mail messages?

Simple/silly question: how do I set/change default font/color for outgoing mail messages?

Just a suggestion..........
Download Thunderbird. Easier to use when it comes to what you want to do w/your emails.

4 Simple Flash Questions that Are Stumping Me!

What is the Frame Rate for Web Animations
Q1. I am making an animation which will be played on the web. What is the default frame rate (fps) of Flash CS5? And what is the frame rate of for web?
Q2. My animation needs to be 30 seconds long. So at 15 fps that would mean I need to use 600 frames in Flash?
How Do I Mask everything so all I see is the Content on the Stage?
I have a wide image that extends past my movies stage size so when I preview my movie the image is visible. How do I mask out anything that extends past my movies window size? I believe I can create a layer named "mask" and place it above all other layers, but I forget how to make the mask. Any help is appreciated.
How to Fade a Graphic
I have a graphic element (some type) and I want it to fade from 0% to 100%. In older versions of Flash I could just select the symbol and then set it's alpha value to 0%, move a few keyframes and then set the alpha to 100%. Voila! but now it doesn't seem to work that way. How can I do this in CS5?

Ned, it says 24 fps which means there is 24 frames per second so each 24 frames is 1 second.
Date: Fri, 4 Nov 2011 05:35:16 -0600
From: [email protected]
To: [email protected]
Subject: 4 Simple Flash Questions that Are Stumping Me!
    Re: 4 Simple Flash Questions that Are Stumping Me!
    created by Ned Murphy in Flash Pro - General - View the full discussion
1 You can create your character as a movieclip and copy/paste that movieclip from one file to another. 2. One way to create a movieclip is to copy all the frame of the animation's timeline (select them all, right click the selection, choose Copy Frames), then create a new movieclip symbol (Insert -> New Symbol...etc) right click on its only keyframe and chhose Paste Frames. THat will put all the layers and frames you copied into the movieclip The only way to come close to being certain about the timing of you animation is to use code to keep track of the time, something like getTimer().. The frame rate that a file plays at is not a reliable means of dictating the time it takes due to a variety of factors which include the amount of content you are trying to process and performance limits of the user's machine.
     Replies to this message go to everyone subscribed to this thread, not directly to the person who posted the message. To post a reply, either reply to this email or visit the message page: http://forums.adobe.com/message/4007420#4007420
     To unsubscribe from this thread, please visit the message page at http://forums.adobe.com/message/4007420#4007420. In the Actions box on the right, click the Stop Email Notifications link.
     Start a new discussion in Flash Pro - General by email or at Adobe Forums
For more information about maintaining your forum email notifications please go to http://forums.adobe.com/message/2936746#2936746.

Simple performance question

Simple performance question. the simplest way possible, assume
I have a int[][][][][] matrix, and a boolean add. The array is several dimensions long.
When add is true, I must add a constant value to each element in the array.
When add is false, I must subtract a constant value to each element in the array.
Assume this is very hot code, i.e. it is called very often. How expensive is the condition checking? I present the two scenarios.
private void process(){
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
         if (add)
         matrix[i][ii][iii][...] += constant;
         else
         matrix[i][ii][iii][...] -= constant;
private void process(){
if (add)
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
         matrix[i][ii][iii][...] += constant;
else
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
    for (int iiii=0;iiii<dimension1;iiii++)
       matrix[i][ii][iii][...] -= constant;
}Is the second scenario worth a significant performance boost? Without understanding how the compilers generates executable code, it seems that in the first case, n^d conditions are checked, whereas in the second, only 1. It is however, less elegant, but I am willing to do it for a significant improvement.

erjoalgo wrote:
I guess my real question is, will the compiler optimize the condition check out when it realizes the boolean value will not change through these iterations, and if it does not, is it worth doing that micro optimization?Almost certainly not; the main reason being that
matrix[i][ii][iii][...] +/-= constantis liable to take many times longer than the condition check, and you can't avoid it. That said, Mel's suggestion is probably the best.
but I will follow amickr advice and not worry about it.Good idea. Saves you getting flamed with all the quotes about premature optimization.
Winston

Simple RMI application

Hi all
I've wrote a simple RMI application; I've made a stub and a skeleton and I've started a rmiregistry; when I'm execute a server, I have this exception:
java.rmi.UnmarshalException: error unmarshalling arguments; ecc.
Where is the problem?

Ok, but I'm a student and my teacher wants ....I'm 49 years old and have blond, long hair (other call it grey, but they are
loonies) and I drive a Ford that doens't want to start when it's freezing
but that's still no excuse for the RMI mechanism not to work properly ;-)
Anyway, the problem was an sub-directory; now I catch a
ConnectException: connection refused (to 127.0.0.1);
any ideas?Yep, you have to start the server part first and then start your client. I also
suspect that you don't have the 'rmiregistry' running ... (we can talk about
that later).
kind regards,
Jos

SIMPLE RMI PROB

I have created a very simple rmi test class passing a bk obkect to a remote library class - the code is below but i keep getting the oops error as specified in the client class - any ideas would be appreciated.
public class bk{
String st;
public bk(String s){
st=s;
import java.rmi.*;
public interface libint extends Remote{
public void addbook(bk b)throws RemoteException;
import java.rmi.*;
import java.rmi.server.*;
import java.util.*;
public class lib extends UnicastRemoteObject implements libint{
Vector v;
public lib()throws RemoteException{
Vector v = new Vector();
System.out.println("lib created");
public void addbook(bk b){
v.add(b);
System.out.println("BOOK ADDED");
import java.rmi.Naming;
public class Server{
public static void main(String args[]){
try{
Naming.rebind("libs", new lib());
System.out.println("System ready");
catch(Exception e){}
import java.rmi.Naming;
public class client{
public static void main(String args[]){
try{
bk b = new bk("john");
libint li = (libint)Naming.lookup("//127.0.0.1/libs");
li.addbook(b);
}catch(Exception e){System.out.println("oops2");}

I kind of guessed it was something to do with the addbook method but i have no idea why - any suggestions would again be welcome - cheers
java.lang.NullPointerException
at lib.addbook(lib.java:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
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 lib_Stub.addbook(Unknown Source)
at client.main(client.java:8)

Problem with a simple RMI program

I'm trying to get a simple RMI program to work, by following the instructions in this link:
http://developer.java.sun.com/developer/technicalArticles/RMI/CreatingApps/index.html#dro
When it gets to this line:
Lookup look_obj = (Lookup)Naming.lookup(name);this exception is generated:
java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:1099 connect,resolve)
What's wrong, eh?

Canadian, eh?
Looks like your security settings on you computer are set to not allow a socket connection.
Specifically is is saying that access to port 1099 on your local machine (127.0.0.1 is the loopback address) is being denied.
There are two main reasons this could happen (off the top of my head), though someone else might know from the message exaclty which one.
1. Your java security permissions do not allow an out going socket connection (are you writing an applet?)
2. Your computer protects access to port 1099.

A few simple Logic questions...please help.

I have a few probably simple Logic questions, that are nonetheless frustrating me, wondering if someone could help me out.
1. I run Logic 8, all of the sounds that came with logic seem to work except organ sounds. I can't trigger any organ sounds (MIDI) on Logic, they won't play. I have a Yamaha Motif as my midi controller.
Any idea why?
2. I've starting running into a situation where I will record a MIDI track, the notes are recorded but they won't playback. The only track effected is the one that was just recorded. All other midi tracks playback.
I have to cut the track, usually go out of Logic and back in, re record for it to playback properly. Any idea why this may be happening?
3. How important is it to update to Logic 9. Are there any disadvantages down the road if I don't upgrade. If I purchase the $200 upgrade, do I get a package of discs and material, or it just a web download.
Any help is appreciated!
Colin

seeren wrote:
Data Stream Studio wrote:
3) You get a full set of disks and manuals.
They're including manuals now?
I think his referring to the booklets ...on how to install etc
It would be great to see printed manuals though ...I love books especially Logic/Audio related !!
A

Simple RMI error

Hello,
I'm trying to compile and execute a simple RMI example. The compilation is OK.
The rmiregistry is running.
I'm using windows and java 1.5
I have the files:
Server <== the Server
myStudentImpl <== remote object
myStudent <== interface
myStudentImpl_Stub <== the Stub of myStudentImpl (generated by rmic)
When I'm trying to execute the command from the Server file
Naming.rebind("john",student);
I'm getting an error.
Error:RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: myStudentImpl_Stub
Then I executed
C:\myrmi2>java -Djava.rmi.server.codebase=c:/myrmic2 Server
.... and I got the below error
Error:Error unmarshaling return; nested exception is:
java.net.MalformedURLException: unknown protocol: c
Probably, I have a mistake with the environment variables.
Can anybody help me, please?
Thanks

Now I'm getting
Error(2):error marshalling arguments; nested exception is:
java.io.NotSerializableException: testprovider.DS.DS_TicketImpl
This is my interface
public interface DS_Ticket extends Remote
public EncryptedTicket RequestTicket(RequestForTicket req) throws RemoteException;
This is my return object
public class EncryptedTicket implements java.io.Serializable
public byte[] cipherToken2;
public byte[] cipherSignToken2;
public byte[] cipherSignature;
public String Description;
This is the parameter object
public class RequestForTicket implements java.io.Serializable
public PublicKey pubKey;
public byte[] e_s_Token2;
public byte[] e_Token2;
public byte[] BeKey;
public byte[] BeToken;
public byte[] signature;
Any idea what I'm doing wrong?
Thank you very much

How to deploy simple RMI server WLS 7

Hi,
I understand that if I write a simple RMI server - not
extending UnicastRemoteObject, no clustering or IIOP
issues - I don't need to run an rmic program. I'm not
clear, however, on what then gets deployed. Does the
client get the interface or implementation class? And, in
this simple case, no deployment descriptor configuration
for RMI is required, correct? I seem to be making this
harder than it's supposed to be ...
Thanks, Garry

Garry, WLS itself is a server , you dont need an additional RMI server. All you need is create an RMI object and bind it to the server JNDI (from the server side) , then your clients can lookup the RMI object via the JNDI and they will get the stubs to make method invocations on the RMI object.
Check out documentation at :
http://e-docs.bea.com/wls/docs81/rmi/rmi_api.html#1000008693

Simple Quick Question

wrong section, post was moved.
Message was edited by:
Rob17

you titled "simple quick question"...
.. complicated to answer..
a) the TermsOfUse of the iTS don't allow any processing of purchased files, these are "copy protected"..
b) iM has a voice-over function..
c) iM is a video-edit app.. easy to use... just learn to handle it...
d) iM allows to "extract" audio (=muting the original audio, adding your own..)
e) to learn iM, spend some time here: http://www.apple.com/ilife/tutorials/imovie/index.html
f) use pencil and paper first! WRITE and scribble, what shall happen when in your movie/parody... make a script, draw a storyboard .. THEN launch iM.. in other words: think first, then edit.. iM is just a tool, it does not "create"... Picasso needed a papertowel and half a stencil to create art....
g) to get comfortable with iM, start with your own, small, short (3min!) project... import some stills, edit them, add a funny voice-over, add sounds, add music... good? make a bigger one...
h) .. in our Lecture II, we teach you how to import shows from TV, youtube, wherever..
standard disclaimer:
be nice to ©opyrights ...

Simple query question

hi all,
I have a XMLType table with one column - I have presently one row, in my column xmlsitedata I have stored one large xml file.The schema definition is given below:
<?xml version="1.0" encoding="UTF-8" ?>
- <xs:schema elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
- <xs:element name="siteList">
- <xs:complexType>
- <xs:sequence>
<xs:element name="site" type="siteType" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
- <xs:complexType name="siteType">
- <xs:sequence>
<xs:element name="nameEn" type="xs:string" />
<xs:element name="nameFr" type="xs:string" />
</xs:sequence>
<xs:attribute name="code" type="xs:string" />
</xs:complexType>
</xs:schema>
I have executed the query below:
select x.XMLSITEDATA.extract('/siteList/site/nameEn/text()').getCLOBVal() "stName" from wsitelist x;
and I get all english names of some 200 locations, however, there is 1 row selected and all names show up on one row. How do I split them into 200 or whatever rows?
Thanks,
Kowalsky

Have a look at the answer provided in the following thread.
very simple XML question
This may solve your problem.
use xmlsequence.
Alvinder

Simple rmi-ejb question

Hi all!
I'm a new to ejb, just started, for the beginning got an exception:
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
     at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:640)
     at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243)
     at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:280)
     at javax.naming.InitialContext.lookup(InitialContext.java:347)
     at SimpleEjbTest.main(SimpleEjbTest.java:19)when trying to
private static Context getInitialContext(String url, String user, String password) throws
      NamingException {
    Hashtable h = new Hashtable();
//    h.put(Context.INITIAL_CONTEXT_FACTORY,
//          "WHAT IS HERE?????");
    h.put(Context.PROVIDER_URL, url);
    h.put(Context.SECURITY_PRINCIPAL, user);
    h.put(Context.SECURITY_CREDENTIALS, password);
    return new InitialContext(h);
}What to put into INITIAL_CONTEXT_FACTORY?
Or you know easier way to make an InitialContext?
Using jndi.properties? But what should it be then??
Please help!
Thanks a lot to alL!!
Best regards, Boris.

well, since you don't specify your app server, how's this?
weblogic.jndi.WLInitialContextFactory
if that doesn't work, try this
com.inprise.j2ee.jndi.CtxFactory
if that doesn't work, try this
com.evermind.server.rmi.RMIInitialContextFactory
if that doesn't work, try this
org.jnp.interfaces.NamingContextFactory
if that doesn't work, try this
com.ibm.websphere.naming.WsnInitialContextFactory
And if that doesn't work, look through your docs again, or maybe try google. Note that whatever you do, you have to have the appropriate jars on your classpath.
Good Luck
Lee

Help me to run this simple RMI example

When i m running this example in standalone pc it works but while running on to different pc it gives error though I m giving the IP address from client of server.. If anyone can help me out plz help.
Code:
ReceiveMessageInterface
import java.rmi.*;
public interface ReceiveMessageInterface extends Remote
void receiveMessage(String x) throws RemoteException;
Server code:
import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.*;
import java.net.*;
public class RmiServer extends java.rmi.server.UnicastRemoteObject
implements ReceiveMessageInterface
int thisPort;
String thisAddress;
Registry registry; // rmi registry for lookup the remote objects.
// This method is called from the remote client by the RMI.
// This is the implementation of the �ReceiveMessageInterface�.
public void receiveMessage(String x) throws RemoteException
System.out.println(x);
public RmiServer() throws RemoteException
try{
// get the address of this host.
thisAddress= (InetAddress.getLocalHost()).toString();
catch(Exception e){
throw new RemoteException("can't get inet address.");
thisPort=3232; // this port(registry�s port)
System.out.println("this address="+thisAddress+",port="+thisPort);
try{
// create the registry and bind the name and object.
registry = LocateRegistry.createRegistry( thisPort );
registry.rebind("rmiServer", this);
catch(RemoteException e){
throw e;
static public void main(String args[])
try{
RmiServer s=new RmiServer();
catch (Exception e) {
e.printStackTrace();
System.exit(1);
Client code:
import java.rmi.*;
import java.rmi.registry.*;
import java.net.*;
public class RmiClient
static public void main(String args[])
ReceiveMessageInterface rmiServer;
Registry registry;
String serverAddress=args[0];
String serverPort=args[1];
String text=args[2];
System.out.println("sending "+text+" to "+serverAddress+":"+serverPort);
try{
// get the �registry�
registry=LocateRegistry.getRegistry(
serverAddress,
(new Integer(serverPort)).intValue()
// look up the remote object
rmiServer=
(ReceiveMessageInterface)(registry.lookup("rmiServer"));
// call the remote method
rmiServer.receiveMessage(text);
catch(RemoteException e){
e.printStackTrace();
catch(NotBoundException e){
e.printStackTrace();
}

When we compile with rmic skeleton and stub get created then we hav to place stub at each client ???Your remote client applcation need only _Stub.class fiels.
Is there way by which we can know how many clients are connected to the
server and there IP address, can anyone give the code... I guess that you should use a RMI login/logout method to register/unregister your client connection information into a databse or a simple static Hashtable(Vector) object.

Simple Report Question

Post Author: scott123
CA Forum: General
I want to take the information in a simple excel table and recreate it 3 times, each time sorting/grouping on a different columnHere is the tableAnd here is the report that I'm trying to generate (first sorted by name, alphabetically, then grouped by rank, then grouped by size) I'm comfortable working with excel tables in Crystal, but I'm running into a problem repeating the information and then sorting each group separately. I also have no problem doing each group in a single report (without repeating any records), but I'd like to include all 3 groups in a single report. My apologies for how remedial this question is- I thought for sure that Crystal could do this easily but I've spent a couple of days on this and am running into a brick wall.

Post Author: pandabear
CA Forum: General
That's right Scott, and maybe make them "on demand"
sub reports so the user only has to see the data they
really want at the moment. Gives the report a nice clean look too.
PB

Simple RMI question

Similar Messages

Maybe you are looking for