What are the benefits of using RMI over TCP/IP? I mean, if I want to merely pass some data to a server(it is not a web application) and get the response back, should I go for RMI with remote calls? Or it is more efficient to stick to TCP/IP sockets? Please advice. |
Hi, I am new to Java and would like to write a robust multi-tier client server application and is not certain whether RMI is the best approach to use. As a result, here are the following questions on this topic: ( i ) Basically, I need to be able to initiate some native commands (e.g. ls -al > /tmp/junk...) on both ... |
I don't have any real trouble (apparently) but I am curious: Why, after settings my remote object reference in my client to null, does my client and server continue to communicate actively? In fact, it only stops when the remote object will be effectively clean on the server. I am running the client and server on the same machine and I ... |
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5. Java RMI coderanch.com |
6. Java RMI coderanch.com |
7. RMI help coderanch.com |
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Hi all, My question is about context passing from client to server using RMI. Here is my situation : I am using spring as framework on client and server in non-J2EE application. I am planning to use RMI to expose a number of services on the server side, using I guess RmiServiceExporter in Spring. The services need authorization but I don't ... |
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Hello, Do you know if there is a way to stop the RMI service on the server side programatically? I started RMI by creating a Registry with LocateRegistry.createRegistry(). I traced the program with jconsole. It seems like whatever I do (unbinding the service, unexporting the exported service object, even unexporting the registry itself), the RMI Accept- thread(s) don't stop. Do I ... |
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hi, i am going nuts right now. i implemented a registry as a singleton. the module containing the registry is offering remote functions with rmi. my problem ist: if the server calls the singleton it has got a different identity as when it gets called from client code accessing offered rmi methods. because to be sure, i checked this by printing ... |
Hi. If I was creating a client-server application using RMI, I have a couple of questions. My main issue deals with how a server sends responses back to client requests. First, let's start with client to server messages though. My assumption is that the client would lookup the server via RMI and put a message on its queue to be processed ... |
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16. RMI coderanch.comjava is the application. The application starts the JVM. -D -jar etc are parameters that you pass to the application which in turn is what is used to configure the JVM and invoke your main class. Double clicking a jar file does none of the above. You can set properties within the main class, but then the values are hard coded. ... |
I'm going to create a networked application that is going to support 1000+ users and I'm wondering if RMI is adequate for this situation. I was thinking about it at first but then I read something about the threading on the RMI server side that it can create a lot of them. If RMI is not suitable for this kind of ... |
Hello, I am using a class that has an RMI call in it. When I attempt to debug everything executes as expected until the object is returned. When the contract object returns, I recieve an error like this: java.io.InvalidClassException: com.dn.lca.dataobjects.Contract; local class incompatible: stream classdesc serialVersionUID = -7475071795924394977, local class serialVersionUID = -3554625892121869643> org.springframework.remoting.RemoteConnectFailureException: Cannot connect to remote service [rmi://localhost:1199/RemoteService]; nested ... |
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when a client invokes a remote call to the server. When the server executes that function, lets say fn1; is fn1 running on the registry process or does the registry process implicitly spawn off another thread for fn1. I am thinking the later, for what if the client, through its stub, invokes fn1 twice before the first fn1 finishes. |
// mathclient import javax.naming.InitialContext; import javax.naming .Context; import java.util.Hashtable; public class mathclient { public static void main(String as[]) { try { System.out.println("starting client "); Hashtable env = new Hashtable(); env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory"); env.put(Context.PROVIDER_URL, "rmi://127.1.1.14:1099"); Context ctx = new InitialContext(env); mathserverinf mathser=(mathserverinf)Naming.lookup("mathser"); System.out.println(" this is "+ mathser.add(1,2)); } catch(Exception ex) { ex.printStackTrace(); } } } |
23. RMI coderanch.comHI I am trying to implement a time syncronization algorithm in distributed systems. I have multiple machine on LAN which run time daemon. One of them is configured to be time master. Others are slave. Master asks all other for their current time. It calculates the average time and sends back the time to all others. All then adjust their time. ... |
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26. RMI coderanch.comhi to all, dont mistake me. i'm new to this forum and rmi.can you any body give me a suggestion or guidline or refer material or website to study RMI.i'm very beginner to rmi,please kindly refer beginners stage/step by step thanks n regards Gopi R. [ May 10, 2008: Message edited by: gopinathr ] |
Yes; but as long as you start applications separately, they will run under different JVMs. A system can have numerous JVMs running on it. If you start these via a command line, just open two separate command lines to start them (or start each as a background task). [ May 15, 2008: Message edited by: Mark Vedder ] |
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Hello, I have run such a configuration of example RMI application: Host1: server.jar - it server application http://host1.local/classes/library.jar - interface of remote object Host2: client.jar - client application Server runs properly only with such options: java -cp d:\interface\library.jar;d:\server\server.jar -Djava.rmi.server.codebase=http://host1/classes/library.jar -Djava.security.policy=d:\server\server.policy app.Server And client with following options (on another host - host2): java -cp c:\interface\library.jar;c:\client\client.jar -Djava.security.policy=c:\client\client.policy app.Client With other combinations of options ... |
Hmm, in retrospect I think I'm being unclear as to what I want to do. I have a server that has to deal with several clients at any given time, and performance & concurrency is an issue. I am hoping that I can use RMI to use function calls to communicate, rather than my own protocol over sockets. I know how ... |
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So, you are asking: If the server and rmi registry are in different machines (different IP addresses) can I register an object from the server in the rmi registry? If this is the question, then the answer is no. RMI registry does not allow bind/rebind from any other IP but the ip of the machine on which it is running. I ... |
Is it possible to have the new I/O ServerSocketChannel class servicing RMI clients ? I'm trying to avoid using threads in my code and , with my limited understanding of the new I/O , think there may be something here I could use. If anyone knows this please help. [ July 19, 2002: Message edited by: HS Thomas ] |
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The whole idea with RMI is that you pass parameters to a method just like you would if the object was local. It is the responsibility of the RMI stub and skeleton to convert these parameters to a serial form and transmit them. And then to get back the result the same way. |
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38. Java RMI coderanch.com |
Hey folks. I was reading the RMI tutorial at java site when I encountered the following : I must create something like : file:/c:/home/user/public_html/classes/ but I am using RMI inside the localhost, so should I create this dirs ? String name = "//host/Compute"; to use the rmi inside my system (localhost), should I change this string to : name = "//localhost:1099/Compute" ... |
Hola all. these days , I am focusing on RMI, so I need your help. assume I have the following files : RemoteInterface.class RemoteServer.class // implements the previous interface Client.class RemoteSrver_stub.class RemoteServer_skel.class which of these files the client should have ? I think they are : client, RemoteInterface and the stub, right ? and the server should contain every thing except ... |
Hi All, I would really like you to help me with this problem which i am facing, as soon as possible. I am new to the SSl world. I have a rmi Client and server which uses connections through SslRMIServerSocketFactory and SslRMIClientSocketFactory. The server that i have created starts fine. When i start the client using the same truststore, policy and ... |
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Which technology suits best here? I want to start\shutdown tomcat server deployed in another(Remote) system .Now ,I am not able to decide which concept will suits best in this environment . AS per my knowledge ,we can use servlet,RMI concept to access remote machine.In this scenario I cannot use servlet because ,if tomcat is shutdown by using our one servlet program ... |
Hi. If I was creating a client-server application using RMI, I have a couple of questions. My main issue deals with how a server sends responses back to client requests. First, let's start with client to server messages though. My assumption is that the client would lookup the server via RMI and put a message on its queue to be processed ... |
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Hi everyone, I'm faily new to java and I don't have any formal training in Software Engineering so here's my question to you. I'm looking into designing a modular application (nothing complex). How extreme would you recommend in modularizing the app? For instance, if I had the following components within an app: InventoryManager.java DeliveryManager.java SiteManager.java OrderManager.java If one class required the ... |
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Looks like you are trying to run the client without putting the stub class in the classpath of client program as the stack trace indicates java.lang.ClassNotFoundException: MyServer_Stub . When you have an RMI server class you need to create the stub and skeleton for the same. JDK tool rmic will help you in doing that.Upon doing rmic you'll get two classes ... |
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - ... |
I'm new to this forum so excuse me if my post is in the wrong place. My problem is the following. I tried RMI for the first time with a small HelloWorld example but when I run the command rmic or rmiregistry in the terminal it just returns me the commandline endlessly. I tried this at home and at work with ... |
I have JSE6 installed. Trying very basic RMI with an interface, a server class and a client class. What are the steps to execute?import java.rmi.Remote; import java.rmi.RemoteException; public interface Echo extends Remote { public void echo(String s4) throws RemoteException; } import java.rmi.registry.LocateRegistry; import java.rmi.registry.Registry; import java.rmi.*; import javax.naming.*; public class EchoClient { private EchoClient() {} public static void main(String[] args) { ... |
i have been assigned a project. which includes controlling operations of other computers in Lan (controlle includes-- usb, drive, registry, restart/shutdown, kill process, run our .exe, resource access, etc) is it feasible with RMI and JNI. [ December 31, 2008: Message edited by: zius oram ] [ December 31, 2008: Message edited by: zius oram ] [ December 31, 2008: Message ... |
Is there a way to create a page whereby you can validate fields on the web server without having to re-request a page to do so (like a CGI app does)? I'd like my app to take advantage of the capabilities available from the browser but still have the application act seamless like one created using VB on the desktop (i.e. ... |
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I am trying to run this example program using Neatbeans 6.1 but I am getting errors when I use the Security Manager. I am attaching the file so could someone give me an idea how to use the Security Manager in Netbeans? This is the Security Policy file I am using: Policy file: grant { permission java.security.AllPermission; }; The Server: package ... |
I have a requirement to built a RMI-Application. Requirement is: A Client/Administrator will execute/start a particular executable on a Remote Machine. Initially I thought RMI can help and started working on the same, I thought that I need multiple RMI-Server side files on Remote Machine to open the service. But doing this will reduced or rather completely Omit the Multiple client ... |
Hi, I've been learning RMI in a class at school. I wrote an app that works on my lan using two computers (server on Ubuntu, client on Windows XP). My DSL connection has a static IP address, and my teacher would like to show the class how this assignment (midterm) works using a remote server. I'm wondering if having the open ... |
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Hi all, I have two machines behind TCP load balancer. Each machine hosts RMI registry on port A, and remote object server on port B. Client sees hostname rmi and ports A and B. When trying to connect, the hostname will be resolved to load balancer and load balancer will route request to one of the machines. The problem is that ... |
I'm writing a Java server application, which I have decided to make use an extra fancy distributed model using Remote Method Invocation so the different parts can talk to each other. I read a tutorial on it, wrote an application, and compiled it. Everything worked up until I ran the part of the server that contained the RMI server code. It ... |
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I have 2 processes (lets name them A and B) in different JVMs, but on the same host. Each of these processes creates an RMI registry (let's call them RegistryA and RegistryB) using LocateRegistry.createRegistry( int port ). RegistryA listens on the default 1099 port, and RegistryB listens on a different port. When I try to get a reference to RegistryB from ... |
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Hi All, I have read about the concepts of RMI. I have understood its concepts and the program. If I want to run it in a standalone computer then its fine, but I want to run it in a networked environment then please do let me know how to deploy the RMI application. I would like to know how to transport ... |
public class MyRemoteImpl extends UnicastRemoteObject implements MyRemote { public MyRemoteImpl() throws RemoteException{ } public String sayHello(){ return "Server says, 'Hello'"; } public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("Setting policy file"); // System.setProperty("java.security.policy", "client.policy"); System.out.println("After setting policy file"); // Create and install a security manager /*if (System.getSecurityManager() == null) { System.setSecurityManager(new RMISecurityManager()); }*/ try{ System.out.println("1"); MyRemote service ... |
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I'm trying to write a four-in-a-row game in java with RMI. I am just currently stuck on the bit when the user selects the column to enter their play coin. I am trying to model this game on this: Connect 4 Thanks for any help you can give me. My Code --------- Client import java.rmi.*; import java.net.*; import java.io.*; import java.util.*; ... |
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Hi! I want to implement a project which will be on the basis of RMI. I have one server and a couple of clients. When one client sends a screen to a server - server forwards it to other client. I think that both client and server have to register their services in rmiregistry. 1). client invokes server's method to send ... |
Hi. According to this: http://java.sun.com/javase/6/docs/platform/rmi/spec/rmi-arch4.html if there is no client connection to the remote object, it might be GC-ed. So, in essence, starting a new RMI server application and exporting some remote object, and then waiting for connections is wrong, isn't it? If GC runs in the time window after the server start and before the first client (which may take ... |
For a class project, groups were asked to implement our own version of RMI and surprisingly, I'm not asking how to do that. Project is finished, submitted, and the final exam has been written, it is only my morbid curiosity that pushes me to learn how it is actually done. I went poking through the source folder provided with the JDK ... |
80. Java RMI coderanch.comPlease excuse me if i am asking the obvious or something which has been previously discussed. I searched a little for this.... but i didnot know what exactly to search. I will keep searching on google to find out if I get an answer. I have been exposed to RMI for the first time after learning Languages. One thing felt a ... |
I try to run RMI over Internet. Locally it is working fine, but when I try to contact the server from my client machine over internet I get a NoPassToRouteException. I searched the Internet for hours but didn't find the apropriate answer. I have a server machine (Linux with Apache web server) where I connect to over SSH. I have a ... |
without seeing you code , I can only assume you are trying to bind your servant on a naming service. what I would normally do, is to always use "rebind(......)" method(even for the first time) instead of "bind(........)" method. if you use bind()... then try to bind() again, it will give you alreadyBind error if you use rebind() initially, then rebind() ... |
Guys, I have an environment wherein there are two non clustered Weblogic instances with each having a couple of EJB's (primarily stateless) deployed. There is a ESB server before the Weblogic stack (also non clustered). Each ESB server communicates to its respective Weblogic. There is a load balancer that sits on top of these two ESB server instances and routes the ... |
I am having a RMI server which invokes an class say X which needs separate Jar to be included. I will return this object of X to the RMI client. To get the object of type X, should RMI client also have jar for class X. I guess it is needed.. Are there any ways to avoid using jar files in ... |
I am not a programmer... I had a guy write a program for me years ago in Java he gave me the code that posts on my server and I know it works I also have the virtual terminal that drives the code. I learned I have a RMI and I got this info from another site. Sounds like an RMI ... |
Hello all, I am trying to implement a distributed Java Web application with Apache installed on machine as a load balancer and 2 other machines having Tomcat to which requests are forwarded. When ever I try to access any applets/Java applications from a client machine, I get the below error which is logged in either of the Slave tomcat . I ... |
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I'd start by asking yourself *why* you want to learn RMI. Although it has some advantages in specific areas, these are in my view outweighed by its disadvantages, especially given the ready availability of solid web services stacks these days. What kind of problem do you envision tackling with RMI that couldn't be handled at least as well using via web ... |
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In RMI we follow many steps . RMI stands for remote method invocation.RMI is a part of JDK(java development kit).It is used for developing distributed application in java.Because java is a plateform independent language.This application develop objects and these objects communicate to each other through an interface.which is stored in a package JAVA.RMI. Java consist of four layer: a.Application layer b.Proxy ... |
Ok, I got the sample code from site : FileServer.java RemoteFileServer.java TestClient.java TestServer.java And the error message I write under NetBeans. Exception in thread "main" java.rmi.ServerError: Error occurred in server thread; nested exception is: java.lang.NoClassDefFoundError: com/healthmarketscience/rmiio/RemoteInputStream at sun.rmi.server.UnicastServerRef.oldDispatch(Unicas tServerRef.java:393) at sun.rmi.server.UnicastServerRef.dispatch(UnicastSe rverRef.java:250) at sun.rmi.transport.Transport$1.run(Transport.java:1 59) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport. java:155) at sun.rmi.transport.tcp.TCPTransport.handleMessages( TCPTransport.java:535) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandl er.run0(TCPTransport.java:790) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandl er.run(TCPTransport.java:649) at ... |
Can some1 tell whats mistake with my code.. import java.rmi.*; import java.net.*; import java.rmi.server.*; public interface AddServerIntf extends Remote { double add(double d1, double d2) throws RemoteException; } public class AddServerImpl extends UnicastRemoteObject implements AddServerIntf { public AddServerImpl() throws RemoteException { } public double add(double d1, double d2) throws RemoteException { return d1 + d2; } } public class AddServer { ... |
93. Rmi java-forums.orgAPPCLIENT non responsive after the deployment and execution of the following(have resolved all previous exceptions): package JVA.remote; import java.util.*; import java.rmi.*; import javax.ejb.spi.*; import javax.*; import javax.ejb.embeddable.EJBContainer; import javax.naming.*; import javax.ejb.*; import javax.naming.Context; import javax.naming.InitialContext; public class MainRemote { public static Context ctx; public static BookEJB bookejb; public static void main(String[] args) { Book book= new Book(); System.setProperty("java.security.policy", "client.policy"); if (System.getSecurityManager() ... |
94. more rmi java-forums.org |
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96. Rmi java-forums.orgwhat is the proper lookup string needed to access this Remote interface for an EJB? 4 INFO FirstFOO was successfully deployed in 751 milliseconds.(details) javax.enterprise.system.tools.admin.org.glassfish. deployment.admin Oct 4, 2011 17:58:54.170 _ThreadID=324;_ThreadName=Thread-2; 3 INFO Glassfish-specific (Non-portable) JNDI names for EJB FooBean : [foo1.FooRemote1#foo1.FooRemote1, foo... (details) javax.enterprise.system.container.ejb.com.sun.ejb. containers Oct 4, 2011 17:58:54.060 _ThreadID=324;_ThreadName=Thread-2; --------------------------------------- Hashtable envHash = new Hashtable(); //envHash.put("java.naming.factory.initial","com.eve rmind.server.ApplicationClientInitialContextFactor y"); envHash.put("java.naming.provider.url","http://0.0.0.0:8080"); ... |
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98. RMI forums.oracle.comHi I am reading about java RMI through some of the books and tutorials over net, but all these tutorials just give an outer view or code examples but nobody exactly tells deep inside what happens at the network level like session maintainance,socket behavior,JVM process etc. during remote calls. Can any body suggest me any resource where I can get the ... |
99. RMI forums.oracle.com |
100. rmi forums.oracle.comCould anyone help me to start and create a e-mail system using rmi. I want it to be able to send attachments like sounds, images and documents. I have coding Frame, Client, Client Implementation, Server and Server Implementation.. I just want to be able recieve and send e-mails with attachments.. If you could point me in the right direction could be ... |