Connection Refused Exception, When trying to implement RMI between 2 ip's
I am trying to implement a simple RMI HelloWorld Program between 2 systems with different IP address, one as server and other as Client, the code is as follows:
Server ( RemoteObject.java)
import java.rmi.Naming;
import java.rmi.RMISecurityManager;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
publicclass RemoteObjectextends UnicastRemoteObjectimplements IRemoteInterface
{
String strName;
public RemoteObject(String strName)throws RemoteException
{
super();
this.strName = strName;
}
public String getMessage(String strMsg)throws RemoteException
{
String strReturn ="My Name is "+strName+", Thanks for your message "+strMsg;
System.out.println("The Return String is "+strReturn);
return strReturn;
}
publicstaticvoid main(String args[])
{
System.setSecurityManager(new RMISecurityManager());
try
{
String myName ="172.21.30.24";//"ServerTest";
RemoteObject theServer =new RemoteObject(myName);
Naming.rebind(myName,theServer);
System.out.println("Ready to continue");
}
catch(Exception e)
{
System.out.println("An Exception occured while creating server"+e);
}
}
}
Client ( RemoteClient.java)
import java.rmi.Naming;
import java.rmi.RMISecurityManager;
publicclass RemoteClient{
publicstaticvoid main(String[] args)
{
System.setSecurityManager(new RMISecurityManager());
try
{
IRemoteInterface server = (IRemoteInterface)Naming.lookup("172.21.30.20");
String strServerString = server.getMessage("Hello There from client");
System.out.println("The server says "+strServerString);
}
catch(Exception e)
{
System.out.println("Exception in RemoteClient"+e);
e.printStackTrace();
}
}
}
Interface (IRemoteInterface.java)
import java.rmi.Remote;
import java.rmi.RemoteException;
publicinterface IRemoteInterfaceextends Remote
{
String getMessage(String strMsg)throws RemoteException;
}
Exception it is giving :
Exception in RemoteClientjava.rmi.ConnectException: Connection refused to host:
172.21.30.24; nested exception is:
java.net.ConnectException: Connection refused: connect
java.rmi.ConnectException: Connection refused to host: 172.21.30.24; nested exce
ption is:
java.net.ConnectException: Connection refused: connect
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(Unknown Source)
at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown Source)
at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown Source)
at sun.rmi.server.UnicastRef.newCall(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at java.rmi.Naming.lookup(Unknown Source)
at RemoteClient.main(RemoteClient.java:25)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(Unknown S
ource)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown S
ource)
... 7 more
81-265-0044-1
start rmiregistry (optional port :default port 1099 )
The policy files in both the systems are as below:
// Standard extensions get all permissions by default
grant codeBase"file:${{java.ext.dirs}}/*"{
permission java.security.AllPermission;
};
// default permissions granted to all domains
grant{
permission java.lang.RuntimePermission"stopThread";
permission java.net.SocketPermission"*:1024-65535","listen,accept,connect";
permission java.util.PropertyPermission"*","read";
permission java.io.FilePermission"*","read,write";
permission java.lang.RuntimePermission"*";
};
Any help would be greatly appreciated.....
