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Struts & Hibernate
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| | | java.rmi.ConnectionExceptionException:Connect refused to host | java.rmi.ConnectionExceptionException:Connect refused to host 2004-11-17 - By Edward King
Back
I write a rmi,when server and client runs in the same machine,it runs ok,then I
run them in two machines,server runs in 192.168.0.1,like follows:
C:\>rmiregistry -J-Djava.security.policy=registerit.policy
C:\>java -Djava.rmi.dgc.leaseValue=1000 -Djava.security.policy=registery.policy
RegisterIt
Object instantiated: HelloServer[RemoteStub [ref: [endpoint:[192.168.0.1:3120](l
ocal),objID:[0]]]]
and it ok ,client runs in 192.168.0.2, but it raise errors:
java -Djava.security.policy=registerit.policy HelloClient
HelloClient exception :java.rmi.ConnectionException:Connection refused to host
:192.168.0.2;nested exception is:java.net.ConnectException  :Connection refused
:connect
Why? how to solve it? I have puzzled with it for many days! Please help.
Any idea will be appreciated!
My code is follows:
--HelloInterface.java--
public interface HelloInterface extends java.rmi.Remote{
public String sayHello() throws java.rmi.RemoteException ;
}
--HelloServer.java--
import java.io.*;
import java.rmi.*;
import java.rmi.server.*;
import java.util.*;
public class HelloServer extends UnicastRemoteObject implements HelloInterface{
public HelloServer() throws RemoteException{
super();
}
public String sayHello() throws RemoteException{
return "Hello world, the current system time is "+new Date();
}
}
--RegisterIt.java--
import java.rmi.*;
public class RegisterIt{
public static void main(String args[]){
try{
HelloServer obj=new HelloServer();
System.out.println("Object instantiated: "+obj);
Naming.rebind("/HelloServer",obj);
System.out.println("HelloServer bound in registery");
}
catch(Exception e){
System.out.println(e);
}
}
}
--registerit.policy--
grant{
permission java.security.AllPermission ;
};
--HelloClient.java--
import java.rmi.*;
public class HelloClient{
public static void main(String args[]){
if(System.getSecurityManager()==null){
System.out.println("null");
System.setSecurityManager(new RMISecurityManager());
}
try{
HelloInterface obj=(HelloInterface)Naming.lookup("/HelloServer");
String message=obj.sayHello();
System.out.println(message);
}
catch(Exception e){
System.out.println("HelloClient exception: "+e);
}
}
}
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<META content="MSHTML 6.00.2600.0" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT size=2>I write a rmi,when server and client runs in the same
machine,it runs ok,then I run them in two machines,server runs in
192.168.0.1,like follows:<BR>C:\>rmiregistry
-J-Djava.security.policy=registerit.policy<BR>C:\>java
-Djava.rmi.dgc.leaseValue=1000 -Djava.security.policy=registery.policy
RegisterIt<BR>Object instantiated: HelloServer[RemoteStub [ref:
[endpoint:[192.168.0.1:3120](l<BR>ocal),objID:[0]]]]</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>and it ok ,client runs in 192.168.0.2, but it raise
errors:<BR>java -Djava.security.policy=registerit.policy
HelloClient<BR>HelloClient exception :java.rmi.ConnectionException:Connection
refused to host:192.168.0.2;nested exception
is:java.net.ConnectException :Connection refused:connect</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>Why? how to solve it? I have puzzled with it for many days!
Please help.<BR>Any idea will be appreciated!</FONT></DIV>
<DIV><FONT size=2> </FONT></DIV>
<DIV><FONT size=2>My code is follows:<BR>--HelloInterface.java--<BR>public
interface HelloInterface extends java.rmi.Remote{<BR>public String sayHello()
throws java.rmi.RemoteException ;<BR>}</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>--HelloServer.java--<BR>import java.io.*;<BR>import
java.rmi.*;<BR>import java.rmi.server.*;<BR>import java.util.*;<BR>public class
HelloServer extends UnicastRemoteObject implements HelloInterface{<BR>public
HelloServer() throws RemoteException{<BR>super();<BR>}</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>public String sayHello() throws RemoteException{<BR>return
"Hello world, the current system time is "+new Date();<BR>}<BR>}</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>--RegisterIt.java--<BR>import java.rmi.*;<BR>public class
RegisterIt{<BR>public static void main(String args[]){<BR>try{<BR>HelloServer
obj=new HelloServer();<BR>System.out.println("Object instantiated:
"+obj);<BR>Naming.rebind("/HelloServer",obj);<BR>System.out.println("HelloServer
bound in registery");<BR>}<BR>catch(Exception e){<BR>System.out.println(e);<BR>}
<BR>}<BR>}</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>--registerit.policy--<BR>grant{<BR>permission
java.security.AllPermission ;<BR>}; </FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>--HelloClient.java--<BR>import java.rmi.*;<BR>public class
HelloClient{<BR>public static void main(String
args[]){<BR>if(System.getSecurityManager()==null){<BR>System.out.println("null"
);<BR>System.setSecurityManager(new
RMISecurityManager());<BR>}<BR>try{<BR>HelloInterface
obj=(HelloInterface)Naming.lookup("/HelloServer");<BR>String
message=obj.sayHello();<BR>System.out.println(message);<BR>}<BR>catch(Exception
e){<BR>System.out.println("HelloClient exception:
"+e);<BR>}<BR>}<BR>}<BR></FONT></DIV></BODY></HTML>
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listserv@(protected) and include in the body of the message "help".
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