RMI connection to registry refused

[Eileen Wilson]

Hi,

I'm having issues getting my rmi server to connect to the registry this the the code:

 
import java.rmi.*;
import java.rmi.server.*;
 
public class SimServiceServer extends UnicastRemoteObject implements SimService{

public SimServiceServer () throws RemoteException
{
super();
}

public String printHelloWorld () throws RemoteException
{
System.out.println("Hello World ... Server side");
return "Hello World ... Client side";
}



public static void main( String args[] ) throws Exception
{
        // Assign a security manager, in the event that dynamic
// classes are loaded
        if (System.getSecurityManager() == null)
            System.setSecurityManager ( new RMISecurityManager() );
 
        // Create an instance of our simulator service server ...
        SimServiceServer svr = new SimServiceServer();
 
        // ... and bind it with the RMI Registry
        try{
        Naming.bind ("rmi://localhost/PowerService", svr);
        }catch(java.security.AccessControlException e){
        System.out.println("EON: AccessControlException: "+e+"\n\n");
        e.printStackTrace();
        }catch(Exception e2){
        System.out.println("EON: Exception: "+e2+"\n\n");
        e2.printStackTrace();
        }
}
}
 
 

And this is the exception trace:

java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused: connect
        at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:574)
        at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185)
        at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:171)
        at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:306)
        at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source)
        at java.rmi.Naming.bind(Naming.java:111)
        at ie.tcd.mzones.RMISimulatorService.SimServiceServer.main(SimServiceServer.java:34)
Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:364)
        at java.net.Socket.connect(Socket.java:507)
        at java.net.Socket.connect(Socket.java:457)
        at java.net.Socket.<init>(Socket.java:365)
        at java.net.Socket.<init>(Socket.java:178)
        at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
        at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
        at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:569)
        ... 6 more  

I do have a firewall running however I have switched it off and the exception remains the same.

I've tried each of the following: my own static IP address, localhost and 127.0.0.1

I'm starting the registry with the following .bat file

 
 
set myjava="C:\Program Files\Java\jdk1.5.0_03\bin"
 
start %myjava%\rmiregistry.exe
 
REM Compile the RMI Simulator Server
 
%myjava%\javac ie\tcd\mzones\RMISimulatorService\*.java
 
%myjava%\rmic.exe ie.tcd.mzones.RMISimulatorService.SimServiceServer
 
REM Start the server
 
%myjava%\java.exe -Djava.rmi.server.hostname=localhost -Djava.security.policy="java.policy" ie.tcd.mzones.RMISimulatorService.SimServiceServer
 
pause
 
 

I'd appreciate any suggestions,
Many thanks
[ August 25, 2005: Message edited by: Eileen Wilson ]

[Nathan Pruett]

Nothing wrong is jumping out at me from what you've posted so far...

Just to make sure, when you run your batch file - a new blank command prompt window pops up and stays up for rmiregistry, right?

Are you setting the "java.rmi.server.hostname" property on your server to see if this fixes the problem you are having, or have you always been setting it? I'd leave it off... I don't see a need to explicitly set it. You'd only need to set this property if you were trying to get around a NAT firewall or something - (as referred to in this post on Sun's forums...)

[Sudha Rams]

Hello,

I too agree with Nathan. I'm a newbie to RMI and I had a similar piece of code working okay.

Just a suggestion: Using localhost works fine only in the same physical host. I had to give the IP address when I executed the client from a different machine from that of the server.

I've given below the details of the batch files that I use:

Here is how I start the registry:

  
cls
 
cd \
 
REM *** Set an empty CLASSPATH ***
 
SET CLASSPATH=
 
echo CLASSPATH is set to %CLASSPATH%
 
REM *** Start the rmiregistry ***
 
rmiregistry

I start the RMI service like this:

 
cls
 
REM *** Compile the common source and business service components ***
 
cd C:\Sudha\Workspace\CommonSources\src
javac -d C:\Sudha\RMIRoot\RMIServerComponents\bin com\mytry\common\data\SunSignPrediction.java
cd \
 
cd C:\Sudha\Workspace\BusinessServices\src
javac -classpath C:\Sudha\RMIRoot\RMIServerComponents\bin -d C:\Sudha\RMIRoot\RMIServerComponents\bin com\mytry\common\services\EntertainmentServices.java
cd \
 
REM *** Compile the remote server components ***
 
cd C:\Sudha\Workspace\RemoteServers\src
javac -classpath C:\Sudha\RMIRoot\RMIServerComponents\bin -d C:\Sudha\RMIRoot\RMIServerComponents\bin com\mytry\learn\rmiandserialization\server\*.java
cd \
 
cd C:\Sudha\Workspace\RemoteServers\src
rmic -classpath C:\Sudha\RMIRoot\RMIServerComponents\bin -d C:\Sudha\RMIRoot\RMIServerComponents\bin com.mytry.learn.rmiandserialization.server.RemoteEntertainmentServicesImpl
cd \
 
REM *** Start the remote service ***
 
cd C:\Sudha\RMIRoot\RMIServerComponents\bin
REM java  -Djava.security.policy=\Sudha\RMIRoot\GeneralRMIComponents\security\policy com.mytry.learn.rmiandserialization.server.RemoteEntertainmentServiceStarter
java  -Djava.rmi.server.codebase=http://172.25.42.23:7001/  -Djava.security.policy=\Sudha\RMIRoot\GeneralRMIComponents\security\policy com.mytry.learn.rmiandserialization.server.RemoteEntertainmentServiceStarter
 

I execute the RMI client like this:

cls
 
REM *** Compile the remote clients components ***
 
cd C:\Sudha\Workspace\RemoteClients\src\com\mytry\learn\rmiandserialization\client
javac -classpath C:\Sudha\RMIRoot\RMIServerComponents\bin -d C:\Sudha\RMIRoot\RMIClientComponents\bin *.java
cd \
 
REM *** Jar the remote client components ***
 
cd C:\Sudha\RMIRoot\RMIClientComponents\bin
jar -cvf C:\Sudha\RMIRoot\RMIClientComponents\lib\ClientCPReference.jar com\mytry\learn\rmiandserialization\client\*.*
 
REM *** Update the jar with the components that are required for successful execution of remote client code ***
 
cd C:\Sudha\RMIRoot\RMIServerComponents\bin
jar -uvf C:\Sudha\RMIRoot\RMIClientComponents\lib\ClientCPReference.jar com\mytry\learn\rmiandserialization\server\RemoteEntertainmentServices.class com\mytry\common\data\*.class
 
REM *** Execute client to use remote service ***
cd \
REM java -classpath C:\Sudha\RMIRoot\RMIClientComponents\lib\ClientCPReference.jar;C:\Sudha\RMIRoot\RMIClientComponents\util;C:\Sudha\RMIRoot\RMIClientComponents\util\rmiapp.properties -Djava.rmi.server.codebase=http://172.25.42.23:7001/ -Djava.security.policy=\Sudha\RMIRoot\GeneralRMIComponents\security\policy com.mytry.learn.rmiandserialization.client.EntertainmentServicesClient
java -classpath C:\Sudha\RMIRoot\RMIClientComponents\lib\ClientCPReference.jar;C:\Sudha\RMIRoot\RMIClientComponents\util;C:\Sudha\RMIRoot\RMIClientComponents\util\rmiapp.properties -Djava.security.policy=\Sudha\RMIRoot\GeneralRMIComponents\security\policy com.mytry.learn.rmiandserialization.client.EntertainmentServicesClient