I'm doing some performance tuning on my application and would like to know a good way of measuring the size of the object that I am sending over RMI.
The aim is ... |
As I understand it, once I've set up an RMI communications link between two systems, I can pass an object that implements "Remote" into one of the remote methods that takes ... |
I have a remote object exposed through RMI, which I use to perform several things on a resource that the object holds. Right now I have method for each operation I ... |
In Java can a remote object also be a client?
So a client may call a remote object and the definition of that tat object through it's interface is a remote ... |
Could someone help on this , please?
Q: An application server registers an object in RMI Registry by calling Naming.rebind(). After a while, the server app goes down. Explain what will happen ... |
How can I test if my reference to an remote object is still alive?
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I have two applications communicating via RMI, a slave server (of which there will be multiple) and a master server.
Following good abstract design, I'd like to implement the slave in a ... |
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i am stuck in a situation, where i need to move balls in multi-user way, i m using RMI
in a distributed animation of moving BALLS .
My goal is to move multiple ... |
There are at least two ways, directly or indirectly, of suggesting that the JVM expend effort collecting garbage:
System.gc()- taking a heap dump and requesting live objects only
In the latter, I can get ... |
I have the folloving RMI server:
public static void main(String[] args) {
try{
ChatSystemImpl chatSystem = new ChatSystemImpl();
...
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Just when I thought I know how RMI works, it comes back and tell me I do not. The following situation:
I have given:
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I have been reading through the Java tutorial on RMI. I like the approach that is outlined here for implementing a remote interface:
http://download.oracle.com/javase/tutorial/rmi/implementing.html
What I would like to know are ... |
I have an RMI server export a single "Manager" class. The RMI client connects to the server, and retrieves the instance of the "Manager" class. Then, I call "Manager.createBox()", which creates ... |
How can I test whether an object is already exported? I migrate objects from host to host. Before I copy an object (with its state) to another node, I have to ... |
I have a desktop C# app that I want to split into two parts - server part and client part. My app is already split into two very independent parts that ... |
Hello everyone,
I have been banging my head really hard trying to solve this problem. I really appreciate if anyone can please have a look at my problem and help me.
I have ... |
In a dialog (window) let suppose we have some buttons and when a button is pressed a remote method invocation take place.
How it is better:
- create the remote object (registry.lookup()) one time ...
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I have an RMI client that connects to some RMI server just to let it know it can use this new client.
Can I pass directly some Remote object so that:
serverRemoteObject.registerClient(theClientRemoteObjectTheServerShouldUse);
will actually ... |
Hello Friends , I am developing a client server distributed application in RMI. I want to know how to place the Remote Objects. I want to Use HTML Client Form as RMI Client. On Server side I want to use Servlets for carring data from RMIClient to RMI Server. Write now i am working on 2 tier Application . I want ... |
I have been trying to understand how RMI works. I have been playing around with a simple example. I have: 1. A client application (HelloClient) 2. An interface (HelloInter) 3. A server implementation (HelloImpl) 4. A class that creates an object. (Person) This class is stored in a separate file from the server implementation. I am trying to get the server ... |
Hi, I plan to implement a design for a "reliable" object transfer system using Java RMI. Since reliable, thus I had thought of the following algorithm: 1. Client sends the object to the server 2. server sends the object back to the client to check if the client had indeed sent the same object 3. client sends a message of confirmation ... |
hi all, 2.6.3 Referential Integrity If two references to an object are passed from one JVM to another JVM in parameters (or in the return value) in a single remote method call and those references refer to the same object in the sending JVM, those references will refer to a single copy of the object in the receiving JVM. More generally ... |
Originally posted by jawwad ahmed: Well i was practicing rmi.I can't find the reason what is the benefit of passing object as value and what is disadvantage of passing by reference if there would be a support in rmi. Thanks. Jawwad Ahmed In short, if the return type of a remote method happens to be a serializable, the client gets a ... |
My question is when you implement a RMI server, how could the server guarantee the response can be sent back to client? If the network is broken after the call has been sent out by client , the client will get an exception. However the server remote method implementation code dose not know that the network is broken. So it will ... |
I want to send a file to server with,at first I use the file object with rmi ,but failed.now I read the file to a byte array like "byte[] file" and invocate a remote method like "public void upload(byte[] file)" with rmi, but failed when the file is big.what can i do? only do it with socket? |
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Lo folks, A while ago I posted a question on sending objects over CORBA, and was advised to use RMI. I've eventually come around, and am now considering using RMI. So... I have a few questions: 1) How would I send an object (containnig sub-objects) across RMI to my server? 2) How can I keep track of multiple servers? At the ... |
Well, yer question honestly does not necessarily pertain to RMI. RMI Server objects are "stateful" if they are implemented as such. If you lookup the same server from two different clients then they will both be making calls back to the same process that is running. So if you call incrementValue() from one and then getValue() from another, then assuming that ... |
Hi, I have App A that has one remote object. When app A starts, it will regiser the remote object with RMI registry. App will also start multiple instances of another application (lets say App B). App A is more like a server, but it also has GUI. So my actual problem here is, I should not allow the user to ... |
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Hi, This is my situation. I have an java app that creates an remote object(lets call this app as Server).This RMI object will be called by some other applications. The server app will launch other JVMs(client apps) which in turn will talk to the server app(meaning talk to the remote object). I leave the server and client application running for a ... |
hi every body as soon as am starting my applications and which creates remote references through rmi it is giving that the server object is not having any remote reference. i found no references >by implementing the unreferenced interface my dbts are: >java.rmi.dg.leaseValue is 10 mins by default i increased this value and tried hold references but no use >but when ... |
Hello sir, madam and my dear friends I read in book that if you want to send any objects from client to server in RMI then they must satisfy the following conditions 1. It must be a serializable object 2. It must be either a primitive type 3. Array or collection of primitive type or serializable object 4. Remote Object I ... |
Hi, I have the following sample code to bind a test remote object to the RMI registry public class RemoteSetup { private static Remote remoteStub; static void callMe() throws Exception { Registry registry; registry = LocateRegistry.createRegistry(1098); TestRemote testRemote = new TestRemoteImpl(); remoteStub = UnicastRemoteObject.exportObject(testRemote, 0); registry.rebind("nitesh", remoteStub); } public static void main(String[] args) throws Exception { callMe(); while(true) { try { ... |
Each client request uses a separate thread on the RMI Server. Any objects created by the threads will be garbage collected at some time. You can share Class variables between threads as long as you protect access. You can use Singleton Classes etc. Just about anything you can do with a non-RMI environment you can do with an RMI Server. The ... |
public class HelloWorldServer implements HelloWorldInterface { public String echo(String input) { return input.toUpperCase(); } /** * @param args */ public static void main(String[] args) { HelloWorldServer server = new HelloWorldServer(); try { HelloWorldInterface stub = (HelloWorldInterface) UnicastRemoteObject .exportObject(server); LocateRegistry.getRegistry().bind("EchoService", stub); System.out.println("Server binded object successfully"); } catch (RemoteException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (AlreadyBoundException e) { // ... |
Hello to all, I have a problem while registering the call back object. I am developing an application in which I use RMI to connect the client with server while client logs in. When client logs in, it registers a call back object to it so that server can communicate with client. At localhost it works fine and server replies to ... |
I read in a book "All networking code you write is applied to interfaces, not implementations. In fact, you must use this paradigm in RMI-IIOPyou do not have a choice. It is impossible to perform a remote invocation directly on an object implementation. You can operate solely on the interface to that objects class." Why is that we can do it ... |
Hi, I have gotten an RMI server and client to limp along. But, my client is getting a not serialized exception on an object when I try to run it. I am pretty sure this is a problem of my design and hope that someone can enlighten me on how to make sure this problem is solved. I have several objects ... |
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Hi, I have made a RMI server and client Software that works if the one calls remote methods that have as parameters simple Objects. More precisely: by simple objects I mean the parameters passed to the remote methods are made of classes where the members are all simple primitive data types. for example: ArrayList arrlst = new ArrayList(); Registry registry = ... |
When I use RMI, are the only objects passed over the network ( and hence need to have a serialID specified ) the ones that you bind to your RMI registry, or are other classes - like exceptions throw in your binded objects also serialized and passed around? so say I have a Car class, and I bind it to my ... |
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Since I have utterly no idea about the structure of your data it is impossible to give you anything but vague suggestions. One of the Java "collection" classes in the java.util package might be suitable, for example an ArrayList will be Serializable and can store a number of objects assuming the client is using Java in the same version as the ... |
$ java -jar project_Client.jar java.lang.IllegalArgumentException: argument type mismatch at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source) at java.lang.reflect.Method.invoke(Unknown Source) at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source) at sun.rmi.transport.Transport$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Unknown Source) at sun.rmi.transport.tcp.TCPTransport.handleMessages( Unknown Source) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandl er.run0(Unknown Source) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandl er.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run Task(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run (Unknown Source) at java.lang.Thread.run(Unknown Source) at sun.rmi.transport.StreamRemoteCall.exceptionReceiv edFromServer(Unknown ... |
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I use UnicastRemoteObject.exportObject(this); to export an object that implements java.rmi.Remote. Then I send this object (wrapped in a MarshalledObject) via an ObjectOutputStream to an application in another JVM (i.e. give it a callback to call my application's methods). In case there are several network adapters there may be need to setup java.rmi.server.hostname property to ensure that the socket given for backward ... |
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