This question already has an answer here:
RMI connection refused on localhost
(1 answer)
Closed 5 years ago.
Doing a course, and I am trying to wrap my head around RMI. I cant seem to get it right. Link to unmodified source code: https://drive.google.com/open?id=0B7NQABLlsgGWbXNhb0JHall4NXM
package helloworld;
import java.rmi.Naming;
public class HelloRMIServer {
// TODO 08. Set the OBJECT_NAME to the same value used by the client.
private static String OBJECT_NAME = "TEST";
public static void main(String[] args) {
try {
// TODO 09. Create a new instance of the remote object.
MessageInterface message = new MessageInterface();
// TODO 10. Re-bind the object in the registry.
Naming.rebind("rmi://" + "127.0.0.1" + "/" + OBJECT_NAME, message);
System.out.println("Server object message bound into registry.");
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("Server done creating and binding objects.");
}
}
What am I doing wrong?
You haven't started the rmiregistry.
Related
I've just started RMI programming recently and had complete most of the parts for the assignment requirements. But there was this question in my head where one of the requirements is supporting multiple threads. Basically in which part should the multi thread be implemented?
Should I make the Server class Runnable or make the objects that are being created in the Server class Runnable?
Here's the code of my Server class:
public class Server {
public static void main(String args[]) {
String portNum = "4444";
try {
Account_Server_Controller accountController = new Account_Server_Controller();
BookCategory_Server_Controller categoryController = new BookCategory_Server_Controller();
Book_Server_Controller bookController = new Book_Server_Controller();
BookActivity_Server_Controller bookActivityController = new BookActivity_Server_Controller();
startRegistry(Integer.parseInt(portNum));
Naming.rebind(ServerLocater.getAccountRegistryURL(), accountController);
Naming.rebind(ServerLocater.getBookRegistryURL(), bookController);
Naming.rebind(ServerLocater.getCategoryRegistryURL(), categoryController);
Naming.rebind(ServerLocater.getBookActivityRegistryURL(), bookActivityController);
System.out.println("Server is Ready.");
} catch (NumberFormatException | MalformedURLException | RemoteException e) {
System.out.println("Exception in Server.main: " + e);
}
}
private static void startRegistry(int rmiPortNum) throws RemoteException {
try {
Registry registry = LocateRegistry.getRegistry(rmiPortNum);
registry.list();
} catch (RemoteException ex) {
System.out.println("RMI registry is not located at port " + rmiPortNum);
Registry registry = LocateRegistry.createRegistry(rmiPortNum);
System.out.println("RMI registry created at port " + rmiPortNum);
}
}
}
No. You don't have to start any threads or implement any Runnables.
You just have to make sure that your remote method implementations are thread-safe.
I've implemented an RMI interface with these current files;
MyClient.java - Clientside code
MyServer.java - Serverside code
Adder.java - Interface
AdderRemote.java - Remote _implements Adder_
DataAccess.java - Contains all the methods to interveen between server and client
I have a vps which contains all files except the Client file in the directory
vps:~/rmi#
When testing this on it's own, ie: compiling on the server, doing
rmic AdderRemote
rmiregistry 5000&
(the port I have chosen)
java -classpath .:mysql-connector... MyServer
and then locally doing the same process but running the MyClient java instead, it works. The problem I am facing is now implementing this into a project I have running in eclipse as a part of this;
I have an instance of MyClient in the main file which is then passed as parameters to the certain classes (This project implements the MVC pattern and is passed to fellow model class'), and I am now getting the error
java.rmi.NotBoundException: xox
after googling, the only response I could find was "Attempt to look up a name that is not bound.", But I'm not really sure what this means? I'll attach my code, and any help would be much appreciated.
MyClient.java
public class MyClient
{
public Adder stub;
public MyClient ()
{
try
{
stub = (Adder)Naming.lookup("rmi://92.222.2.96:5000/xox");
}
catch (Exception e)
{
System.out.println(e.toString());
}
}
public static void connect(Adder stub) throws RemoteException
{
System.out.println(stub.connect());
}
Adder.java
public interface Adder extends Remote
{
public String connect() throws RemoteException;
}
AdderRemote.java
public class AdderRemote extends UnicastRemoteObject implements Adder
{
public AdderRemote() throws RemoteException
{
super();
da = new DataAccess();
}
DataAccess da;
public String connect() throws RemoteException
{
return da.connect();
}
DataAccess.java
public class DataAccess
{
// Connection info
static final String URL = "jdbc:mysql://92.222.2.96:3306/groupproj";
static final String DRIVER = "com.mysql.jdbc.Driver";
static final String USERNAME = "root";
static final String PASSWORD = "*****";
Connection c = null;
public String connect()
{
try
{
Class.forName(DRIVER).newInstance(); //Load DB driver
c = DriverManager.getConnection(URL, USERNAME, PASSWORD); //Establish connection to DB2
return "Connected.";
}
catch(Exception e)
{
return e.toString();
}
}
MyServer.java
public class MyServer
{
public static void main ( String args[] )
{
try
{
Adder stub = new AdderRemote();
Naming.rebind("rmi://92.222.2.96:5000/xox", stub);
}
catch ( Exception e )
{
System.out.println(e);
}
}
public static void connect(Adder stub) throws RemoteException
{
try
{
stub.connect();
}
catch(Exception e)
{
System.out.println("Could not connect to the DB.");
}
}
I gathered that because the files on the server are located in the directory "rmi" I renamed the xox to this, but this did not solve the problem, so I reverted it back to xox, which it worked before putting it into a java project.
Thank you
You must have got an exception doing the bind.
If you got a NotBoundException when looking up the same name in the same Registry you're supposed to have bound it to, you didn't bind it at all.
Notes:
You can only bind to a Registry that is running in the same host as yourself. For that reason it is convenient to always use "localhost" as the hostname when calling bind(), rebind(), or unbind().
You'd be better off letting the RemoteException and NotBoundException be thrown from the constructor of MyClient.
MyClient.connect() should not be static. In fact it cannot be static. Ergo this cannot be the real code.
From what we can see so far, your system isn't correctly designed. Your server should get a DBMS connection when it needs one, inside a remote method, on behalf of the client that is calling that method, and release it before exiting the method. Opening a new connection every time a client asks for one explicity and storing it into an instance variable of the remote object (a) will leak connections and (b) won't work when concurrent clients come to execute a query or update on the same connection.
Hi all I have question related with Pyro4 and Java. My question is how can I send information between RMI server in Java and clients RMI in Python?.
This is my code, I don't have any errors but I can't send anything.
Java Code:
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 �gReceiveMessageInterface�h.
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�fs 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);
}
}
}
And this is my code in Python:
import Pyro4
proxy=Pyro4.core.Proxy("PYRONAME:PhDJara/127.0.1.1")
print("5*11=%d" % proxy.multiply(5,11)) print("'x'*10=%s" %
proxy.multiply('x',10))
Thanks for your help.
jarain78
What makes you think that you should be able to connect these two?
Pyro4 is only conceptually similar to Java's RMI, but they're two totally different protocols. You cannot connect them directly.
If you want to write a Python client using Pyro and talk to a server, that server has to be a Pyro server. The only way to create one in Java is by using Jython + Pyro.
I'm trying to get a RMI program to work. So far, the server starts up correctly but the client fails casting the remote object to the interface.
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException:
com.sun.proxy.$Proxy0 cannot be cast to MonitorClient.InterfaceMonitor
All other answers I've found are for cases where the end user has cast the equivalent of InterfaceMonitorImpl (unknown to the client) instead of the Interface instead. This is not my case and I'm really at a loss here — RMI is nightmare-ish.
Server side
Main:
InterfaceMonitor obj;
try {
LocateRegistry.createRegistry(1099);
InterfaceMonitor stub = (InterfaceMonitor) UnicastRemoteObject.exportObject(new InterfaceMonitorImpl(), 0);
Registry registry = LocateRegistry.getRegistry();
registry.bind("imon", stub);
System.out.println("Server ready");
} catch (RemoteException | AlreadyBoundException ex) {
System.out.println("Server error: " + ex.toString());
}
InterfaceMonitor.java:
public interface InterfaceMonitor extends Remote {
int checkAge() throws RemoteException;
}
InterfaceMonitorImpl.java:
public class InterfaceMonitorImpl implements InterfaceMonitor {
public InterfaceMonitorImpl() throws RemoteException {
}
#Override
public int counter() throws RemoteException {
return 10;
}
}
Client side
try {
Registry reg = LocateRegistry.getRegistry(null);
InterfaceMonitor im = (InterfaceMonitor) reg.lookup("imon");
int counter = im.counter();
System.out.println("Counter: " + counter);
} catch (NotBoundException | RemoteException ex) {
Logger.getLogger(MonitorGUI.class.getName()).log(Level.SEVERE, null, ex);
}
The InterfaceMonitor.java is also on the client side.
Thanks for your time!
Obviously you must have two copies of InterfaceMonitor: one in MonitorClient and one in what may be something like MonitorServer. That makes two different classes. Not two copies of the same class. The class name, package, method declarations, inheritance, ... all have to be the same.
This question already has answers here:
java.rmi.NoSuchObjectException: no such object in table
(7 answers)
Closed 3 years ago.
My goal is to create a Distributed computing program that launches a server and client at the same time. I need it to be able to install on a couple of machines and have all the machines communicating with each other, i.e. Master node and 5 slave nodes all from one application.
My problem is that I cannot properly use unicastRef, I'm thinking that it is a problem with launching everything on the same port, is there a better way I am overlooking?
this is part of my code (the part that matters)
try {
RMIServer obj = new RMIServer();
obj.start(5225);
} catch (Exception e) {
e.printStackTrace();
}
try {
System.out.println("We are slave's ");
Registry rr = LocateRegistry.getRegistry("127.0.0.1", Store.PORT, new RClient());
Call ss = (Call) rr.lookup("FILLER");
System.out.println(ss.getHello());
} catch (Exception e) {
e.printStackTrace();
}
}
this is my main class (above)
this is the server class (below)
public RMIServer() {
}
public void start(int port) throws Exception {
try {
Registry registry = LocateRegistry.createRegistry(port, new RClient(), new RServer());
Call stuff = new Call();
registry.bind("FILLER", stuff);
System.out.println("Server ready");
} catch (Exception e) {
System.err.println("Server exception: " + e.toString());
e.printStackTrace();
}
}
I don't know what I am missing or what I am overlooking but the output looks like this.
Listen on 5225
Listen on 8776
Server ready
We are slave's
Listen on 8776
java.rmi.NoSuchObjectException: no such object in table
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:359)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at Main.main(Main.java:62)
line 62 is this ::: Call ss = (Call) rr.lookup("FILLER");
Maybe it's because your reference to the stub in your server class is local to the try block and the reference is immediately garbage collected after. Try making stuff a class variable instead.