Rmi connection refused with localhost

Question

I have a problem using java rmi   When I m trying to run my server  I get a connectException  see below    Exception happens when executing the rebind method   Runtime getRuntime   exec  rmiregistry 2020    MyServer server   new MyServer    Naming rebind    localhost 2020 RemoteDataPointHandler   server     when using rmi   localhost 2020 RemoteDataPointHandler instead  it doesn t work either  Also using the default port does not work  I also tried using the 127 0 0 1 ip-address  but with the same effect   my runtime args   -Djava security policy java security AllPermission    Exception in thread  main  java rmi ConnectException  Connection refused to host  localhost  nested exception is       java net ConnectException  Connection refused     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 rebind Unknown Source      at java rmi Naming rebind Naming java 160      at be fortega knx server Main  Main java 25      at be fortega knx server Main main Main java 16  Caused by  java net ConnectException  Connection refused     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 433      at java net Socket connect Socket java 524      at java net Socket connect Socket java 474      at java net Socket  Socket java 371      at java net Socket  Socket java 184      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          7 more

User · Answer

it seems that you should set your command as an String[],for example:

String[] command = new String[]{"rmiregistry","2020"};
Runtime.getRuntime().exec(command);

it just like the style of main(String[] args).

User · Answer

One difference we can note in Windows is   If you use Runtime getRuntime   exec  rmiregistry 1024     you can see rmiregistry exe process will run in your Task Manager  whereas if you use Registry registry   LocateRegistry createRegistry 1024    you can not see the process running in Task Manager   I think Java handles it in a different way   and this is my server policy file  Before running the the application  make sure that you killed all your existing  javaw exe and rmiregistry exe corresponds to your rmi programs which are already running   The following code works for me by using Registry LocateRegistry   or  Runtime getRuntime exec           Standard extensions get all permissions by default  grant       permission java security AllPermission       VM argument  -Djava rmi server codebase file  C  Users Durai workspace RMI2 src    Code   package server       import java rmi Naming  import java rmi RMISecurityManager  import java rmi Remote  import java rmi registry LocateRegistry  import java rmi registry Registry   public class HelloServer      public static void main  String   argv           try            if System getSecurityManager    null               System setProperty  java security policy   C   Users  Durai  workspace  RMI  src  server  server policy                System setSecurityManager new RMISecurityManager                 Runtime getRuntime   exec  rmiregistry 1024             Registry registry   LocateRegistry createRegistry 1024           registry rebind   Hello   new Hello   Hello From Roseindia net pvt ltd           Process process   Runtime getRuntime   exec  C   Users  Durai  workspace  RMI  src  server  rmi registry start bat             Naming rebind     localhost 1024 Hello  new Hello   Hello From Roseindia net pvt ltd             System out println   Server is connected and ready for operation                catch  Exception e          System out println   Server not connected      e         e printStackTrace

User · Answer

You need to have a rmiregistry running before attempting to connect  register  a RMI service with it    The LocateRegistry createRegistry 2020  method call creates and exports a registry on the specified port number    See the documentation for LocateRegistry

User · Answer

had a simliar problem with that connection exception  it is thrown either when the registry is not started yet  like in your case  or when the registry is already unexported  like in my case    but a short comment to the difference between the 2 ways to start the registry   Runtime getRuntime   exec  rmiregistry 2020      runs the rmiregistry exe in javas bin-directory in a new process and continues parallel with your java code   LocateRegistry createRegistry 2020     the rmi method call starts the registry  returns the reference to that registry remote object and then continues with the next statement   in your case the registry is not started in time when you try to bind your object

User · Answer

It seems to work when I replace the  Runtime getRuntime   exec  rmiregistry 2020      by  LocateRegistry createRegistry 2020     anyone an idea why  What s the difference

[java] Rmi connection refused with localhost

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