What is Remote Object?

Hi All,
It would be great if any one can give me exact definition of "What is Remote Object"?
Thanks & Regards,
Venkat

It's programmer short hand for:
"The object of my desire is not in the same sphere as I, therefore, the oject of my desire is remote to me, therefore, a remote object."
If this is not what mean, then try searching the API or this forum.

Similar Messages

Remote Object - not able to get the returned value from java method

     Hi ,
I am developing one sample flex aplication that connects to the java code and displays the returned value from the
java method in flex client. Here I am able to invoke the java method but not able to collect the returned value.
lastResult is giving null . I am able to see the sysout messages in server console.
I am using flex 3.2 and blazeds server and java 1.5
Here is the code what I have written.
<?xml version="1.0" encoding="utf-8"?><mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" backgroundColor="#FFFFFF" initialize="initApp()">
<mx:Script><![CDATA[
import mx.controls.Alert;
import mx.binding.utils.ChangeWatcher;
import mx.rpc.events.ResultEvent;
import mx.messaging.*;
import mx.messaging.channels.*
public function initApp():void {
     var cs:ChannelSet = new ChannelSet();
     var customChannel:Channel = new AMFChannel("my-amf", "http://localhost:8400/blazeds/messagebroker/amf");     cs.addChannel(customChannel);
     remoteObj.channelSet = cs;
public function writeToConsole():void {      remoteObj.writeToConsole(
"hello from Flash client");
      var returnedVal:String = remoteObj.setName().lastResult;     Alert.show(returnedVal);
//[Bindable]
// private var returnedVal:String;
]]>
</mx:Script>
<mx:RemoteObject id="remoteObj" destination="sro" />
<mx:Form width="437" height="281">
<mx:FormItem>
</mx:FormItem>
<mx:Button label="Write To Server Console" click="writeToConsole()"/>
</mx:Form>
</mx:WindowedApplication>
Java code
public
     public SimpleRemoteObject(){
          super();     }
class SimpleRemoteObject {
     public void writeToConsole(String msg) {          System.out.println("SimpleRemoteObject.write: " + msg);     }
     public String setName(){          System.
out.println("Name changed in Java");
          return "Name changed in Java";
And I have configured destination in remote-config.xml
<destination id="sro">
   <properties>
    <source>SimpleRemoteObject</source>
    <scope>application</scope>
   </properties>
</destination>
Please help me .

You are not able to get the returned value because if you see the Remote object help you will realise you have to use result="resultfn()" and fault = "faultfn()"
In this you define what you wish to do.
More importantly in the remote object you need to define which method you wish to call using the method class like this
<mx:RemoteObject id="remoteObj" destination="sro" result="r1" fault="f1" >
     <Method name="javaMethodName" result="r2" fault="f2"/>
<mx:RemoteObject>
r2 is the function where you get the result back from java and can use it to send the alert.

Two remote objects calls on the same php class

Hi to all,
I've encountered a strange issue while developing with remote objects.
I've a mxml component with an init() method inside which is called by a menu.
When the init() method is called it makes 7 remote object calls which are bound to some components' dataprovider.
Among this calls I've got 2 remote object which refer to the same remote class. This because I have to call the class twice and the bind the result to two different combobox. Below you find the code:
<mx:RemoteObject id="myFile" source="myRemoteClass" destination="amfphp" showBusyCursor="true" makeObjectsBindable="true" fault="traceFault(event)"/>
<mx:RemoteObject id="myXls" source="myRemoteClass" destination="amfphp" showBusyCursor="true" makeObjectsBindable="true" fault="traceFault(event)"/>
in the init function I make this calls:
myFile.listDir("dir_1")
myXls.listDir("dir_2")
then in the mxml code I bound the result of myFile to combobox1 and the result of myXls on combobox2.
The problem arise when I call the myXls' listDir method. When I call it I receive the following error:
code:
Client.Error.DeliveryInDoubt
Message:
Channel disconnected
Detail:
Channel disconnected before an acknowledgement was received
The strange thing is that not only the myXls object returns this error, but also all the other 6 remote object return the same error above.
I'm not sure, but I guess that the error could be caused by the two remote object which call the same php remote class. If I comment one of the two calls everything works fine.
Do you have any suggestion about?
Thanks!!
Bye
Luke

Hi Jan.
1) We have the 2 VO, each with 3 rows to fill in data. What I mean is that when i just fill in all the fields for the first row of the first VO, and the value of one of these fields is bigger than 50, then after the exception is thrown and the message is displayed, the fields for the first VO are duplicated and shown in the second VO as if the user had inserted them.
2) We tried yesterday the validateEntity and a Method and Atributte Validator approaches after reading that white paper with the same results.
The validation is correctly done using any of the those methods.
I will try to reproduce this issue with the HR schema.
Thanks in advance once again.

PL/SQL: ORA-04052: error occurred when looking up remote object.

Hi All,
I'm getting the following error message while executing a PL/SQL Block.
PL/SQL: ORA-04052: error occurred when looking up remote object UPLDUSER.filestatushistory@FTS
ORA-00604: error occurred at recursive SQL level 1
ORA-03106: fatal two-task communication protocol error
ORA-02063: preceding line from FTSStatement
declare
v_coun number;
begin
select count(*) into v_coun
from updluser.filestatushistory@fts;
end;Back ground of the situation as follows,
My DataBase version 10.2.0.3 DB Name :DB1
Table Owner : UPLDUSER
Table Name : FILESTATUSHISTORY
I have a report user on the same database and I have grant all on the above table to report user
Report User : RPT_FTS
SQL> GRANT ALL ON FILESTATUSHISTORY_V TO RPT_FTS;Now Please find the below database details where I'm getting subjected error.
Database version : 9.2.0.8
DB Name : DB2
User Name : RPT_REPORTS
I Have create a dblink from RPT_REPORTS to RPT_FTS on DB1 and the dblink works fine. But getting the above error while running it.
but When I do the same other 10.2.0.3 db , the above PL/SQL block works fine without any problem.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Now the strange about this is that I have Created a new table on DB1 db like below;
SQL> CREATE TABLE UPLDUSER.ABC AS SELECT * FROM FILESTATUSHISTORY;and retry my code on DB2 (9.2.0.8) after changing the table to ABC and it worked. Now I don't know whats wrong with a original table(FILESTATUSHISTORY).
To over come the problem and a work-a-round method I create a view on the DB1 (RPT_FTS) like the below
SQL> CREATE VIEW FILESTATUSHISTORY AS SELECT * FROM UPLDUSER.FILESTATUSHISTORY;and was able to run the PL/SQL block Remotely.
Just wants To know what whould have been the cause for this .
Cheers
Kanchana

Hi Kanchana,
Perhaps following link of google search has answer to your query
ORA-04052. The search result contains some useful articles whose URLs I shan't post in the forums.
HTH!
*009*

Trying to create a local instance of the remote object

Hi,
I have a ClassA on which I need to be able to invoke RMI calls. Problem is the interface which ClassA implements does not throw exceptions. To get around this problem I have created a wrapper class ClassWrap which has a ClassA attribute and calls made to ClassWrap are directed to this ClassA object. A facade type design I think it's called.
ClassWrap implements Remote so it can be used as a Remote object.
When I create an instance of ClassWrap and deploy it on a server, my client has no problem communicating with the remote ClassWrap object via a remote stub ClassWrap_Stub.
Problem is I also want my client to be able to use a local instance of ClassWrap. Whan I try to create an instance of ClassWrap in my client I get a remote Exception ... but !! when I have a ClassWrap_Stub object in my classpath then there is no problem creating a ClassWrap object.
Any ideas why this happens?

What you are trying to do should work just fine. Do you have the wrapper class file in your client jar?

How does the remote object connect to the correct host

i have had a small doubt on how the remote reference manages to find the correct host to call the subsequent methods after a sucessful lookup.
given a rebind or bind to the registry, the registry only stores the alias and the remote reference, now imagine a client calling a lookup on the registry would only get the remote reference, and not in which machine the remote object is found.
what i wanted to know is how does the client or atleast the remote reference returned by the registry correctly connects to the machine where the remote object is located. i dont think its stored in the stub bcos the stub is a complie time stuff.
i would be pleased to have a comprehensive answer for this.

The membership in the group communication framework is always accurate and upto date.Up to date to the moment when you check. Not up to date to the moment when you make the RMI call.
i could basically chk if this ip is available in the membership list.Complete waste of time. It doesn't matter what you check ahead of time, you are still trying to predict the future.
And you still have to deal with ConnectException etc from the actual remote method call. And the way you will deal with that in your situation is exactly the same as what you were going to do if your ahead-of-time check failed.
So just catch the exception(s) and deal with the problem there.

Clustered Remote Object Bound To JNDI

Hello,
          I'd like to know if Weblogic 5.1 (service pack 10) supports
          clusterable remote objects.
          What I am trying to do is to implement a remote object that extends
          UnicastRemoteObject interface and bind it to JNDI. When the client
          needs the services, it will lookup that object in JNDI and call its
          methods remotely.
          What happens to my test implementation is that it all works well when
          I run Weblogic locally, but if it is run on the remote server, it
          gives me the exception to the extend that the stub for my remote
          object is not found (although it is in the classpath). I understand
          that this is because I should be using weblogic.rmic instead of
          regular rmic, is that right?
          Thanks,
          Eugene Kononov.


Hello,
          I'd like to know if Weblogic 5.1 (service pack 10) supports
          clusterable remote objects.
          What I am trying to do is to implement a remote object that extends
          UnicastRemoteObject interface and bind it to JNDI. When the client
          needs the services, it will lookup that object in JNDI and call its
          methods remotely.
          What happens to my test implementation is that it all works well when
          I run Weblogic locally, but if it is run on the remote server, it
          gives me the exception to the extend that the stub for my remote
          object is not found (although it is in the classpath). I understand
          that this is because I should be using weblogic.rmic instead of
          regular rmic, is that right?
          Thanks,
          Eugene Kononov.

Creating remote objects and passing the retrieved data to modules

I found at this Adobe tutorial a nice "RemoteService" class that creates a RemoteObject and contains the functions for handling the result and fault events. If I wanted to use this approach, how could I pass the data from the result handler to interfaces that modules from the main application could use?
I could put the RemoteService/RemoteObject in the modules, but (in my opinion- and I could be wrong) the best design seems to be using the remote calls in the main app and passing the data along to the modules.
Ultimately, I would like to know what the "best practices" are for creating remote objects and passing the retrieved data to modules
Thanks!

public void mouseClicked(MouseEvent e) {
X x = new X(e.getX(), e.getY());
}I don't see the difficulty.

Mapping: ORA-04052 Remote Object not found

Hi,
I created a source module with a table reading from an external Oracle database. I can see data so the connection seems to work.
In the target module a mapping trying to read from this table can´t be deployed with this errors message:
- ora-06550: package body, line 0, column 0: ORA 04052: Error while trying to find the remote object: <name of the object> ....... ora-02019: connection description for remote-database not found.
An equal internal mapping, not adressing an external database, works find.
Any idea?
Thanks so much.
Georg

oh, of course.
I could not find dblink, saw some source information. What section/s is /are to be checked?
I find code like
SELECT
/*+ NO_MERGE */
/* OBJSTAMM.INOUTGRP1 */
"OBJSTAMM"."OBJEKTNUMMER" "OBJEKTNUMMER"
FROM
"VMAN30M"."OBJSTAMM"@"PDORA06@QUELLE_VISMAN_LOCATION" "OBJSTAMM"
Is there a way to find out the correct "from" path?
Thanks Georg
Edited by: georgo on 02.05.2011 16:34

How to call a function/event after a Remote Object's data is loaded?

I'm making a call to a remote object that is loading a good
amount of data. I've set up a "please wait" label that is supposed
to display while the data is being loaded and then clear the label
when the data finishes loading.
At the moment I've got it set up like so...
label = 'Loading data, please wait..."
remoteObj.read.send();
label = ''
The problem with this is that the 'please wait' label doesn't
even display because the actual call to the remote object I'm
making finishes so quickly even though the data load does not. So
what I need is possibly an IF statement to check if the data has
finished loading. If it hasn't finished loading, the label stays in
the "please wait" status, or if the data does finish loading, then
the label clears out.
What would be ideal is...
remoteObj.read.send(); // gets the data
if(data is loaded){
label = '';
}else{
label = 'Please wait'
I just don't know how to form the statement for the data
loading in the IF statement.

You are seeing the difference between data loading and UI
rendereing.
Reasonable amounts of data load very fast, expecially with
RemoteObject. Bur rendering the UI is almost always the bottleneck,
event with AS3 FP8+, which is about 30 percent faster than AS2!
I have not found a perfect solution for this myself, but i
think you will want to look into the component data events, to find
one that fires after the component is actually rendered.
Tracy

Remote object taking more time to respond

I am using live cycle data services to access my remote java object. Sometimes remote object is taking a lot of time to respond (even 15 minutes). Please give
me some solution.

Can you enable LCDS logging and see if you are seeing any errors? What client (Flex, JS, iOS, Java) are you using? In general, you can bound the timeout on request. Look at the documentation for client (Flex, JS, iOS, Java) are you using, for how to do it.
Rohit

Logical model cannot refer to 'remote objects'?

Hi
Using DM 3.3.0.747.
In the relational model one can drag and drop in a table from another relational model from a separate design. This shows that table as a linked table and can be refreshed via the 'Synchronize Remote Objects' and allows that table to be referenced from your 'local' tables (i.e. used in foreign keys).
I tried the same, but for a logical model entity. This does not work/is not allowed? What is the expected behaviour?
We would like to use this for logical models as well. (So that we may develop/document the logical models separate, but use common/shared entities in the same way possible in relational models. This will help us a lot in keeping the models smaller and easier to manage and version control.)
Thank you & Regards

Hi Ed,
I presume you had some relationships in the Logical Model that you were expecting to be engineered to Foreign Key relationships in the Relational Model.
Please can you provide more detail to help resolve your problem. For example:
Was the problem on an initial engineer from the logical model? Or on a re-engineer?
Are you using Entity subtyping in your Logical Model?
Are there any relevant error messages in the log file? (This is normally file datamodeler.log in folder datamodeler\datamodeler\log.)
David

ClassCastException at Remote object although remote interface is implemented

Hi,
I want to access a remote object via T3 (on WebLogic 10) but I am
getting a ClassCastException in the client. The exception is thrown if
the generic "Remote" object is casted into a concrete remote interface.
The following works ok (client side, get remote object via JNDI):
Hashtable hashTable = new Hashtable();
hashTable.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
hashTable.put(Context.PROVIDER_URL, "t3://localhost:7001);
ic = new InitialContext(hashTable);
Remote r = (Remote) ic.lookup("...jndi bind name...");
But this cast fails:
IMyRemoteIntf i = (IMintRemoteIntf) r;
The ClassCastException has the classname of the class which implements
the remote interface - the lookup should be ok therefore. With
r.getClass().getInterfaces() I have verified that the remote object
actually implements the appropriate interface. I suppose it is a class
loader issue then and added some debug output.
Class loader parent chain of IMyRemoteIntf:
weblogic.utils.classloaders.ChangeAwareClassLoader@1715ee2
-> weblogic.utils.classloaders.GenericClassLoader@123ade0
-> weblogic.utils.classloaders.FilteringClassLoader@1312cf9
-> weblogic.utils.classloaders.GenericClassLoader@159ea8e
-> java.net.URLClassLoader@82d37
-> sun.misc.Launcher$AppClassLoader@e39a3e
-> sun.misc.Launcher$ExtClassLoader@a39137
Class loader parent chain of IMyRemoteIntf as reported by r.getInterfaces():
sun.misc.Launcher$AppClassLoader@e39a3e
-> sun.misc.Launcher$ExtClassLoader@a39137
IMyRemoteIntf is in a jar file in WEB-INF/lib of my web application. I
tried prefer-web-inf-classes = true in weblogic.xml as well as
prefer-application-packages in weblogic-application.xml (with the
respective package of the interface).
Any ideas? I don't know what more I can try. I can access the same
server with this t3 URL just fine from outside of the WebLogic server.
Regards
Werner

I meant an issue about multi-connections. Although the socket is shared by all of the connections, each connection in RMI might correspond to a separated thread, I guess. Since the socket is shared by all rmi clients, the RMI channel would be a blocking connection. I am not sure if the RMI in JDK1.4 or above also use the nonblocking new I/O technique. Thanks.

Is the Remote Object always a singleton?

Hi,
Using .Net Remoting we can export a Remote Objects in three different ways:
1. Singleton: Same instance of a Server-side object is used by all the clients for all the requests.
2. SingleCall: Whenever a new call is received, a new instance of the Server-side object is created and reference is passed to the client. Therefore, for each call to the server, the client gets a new instance of the object.
3. Client Activation: In this, the Client requests to the server for creating a new instance which can be used for multiple calls. The instance activated by a client is not used by other clients. Client-Activated objects can store state information between method calls for its specific client.
Do we have this options in RMI or the Remote Object must always be a Singleton?
What I'm looking for is a way to create one instance of the Remote Object (in the server side) to each client that connects to a server.
thx

Do we have this options in RMI1 and 3 are available. 2 is not.
or the Remote Object must always be a Singleton?No.
What I'm looking for is a way to create one instance of the Remote Object (in the server side) to each client that connects to a server.It's as simple as 'return new MyRemoteObject(...);'.
For example:
public interface Login extends Remote
public Session login(String username, ...) throws RemoteException;
public interface Session extends Remote
// your client API here
public class LoginImpl extends UnicastRemoteObject implements Login
public Session login(String username, ...) throws RemoteException
// validate username etc. If OK return a session.
return new SessionImpl();
public class SessionImpl extends UnicastRemoteObject implements Session
// your client API implementation here, also all the server-side state belonging to that client session
}Note that this is as secure as the login() method. By type safety, nobody can execute Session methods until they have logged in.
I'm deleting your two other threads.

The Remote object used on proxy server?

Hai,
Iam attended for one interview they asked me one question
could send me the answer
The Remote object used on proxy server?

That's not even a question. What did they really ask you?

What is Remote Object?

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