I meet a RMI Exception ,Can you help me!!

Question

This is the main Method:
public static void main(String[] args) throws IOException, ActivationException, NamingException, NotBoundException
          System.out.println("Construting activiton description...");
          Properties pro=new Properties();
          pro.put("java.security.policy", new File("server.policy").getCanonicalPath());
          ActivationGroupDesc groupDesc=new ActivationGroupDesc(pro,null);
          ActivationGroupID id=ActivationGroup.getSystem().registerGroup(groupDesc);
          MarshalledObject paPara1=new MarshalledObject("This book is for Student");
          MarshalledObject paPara2=new MarshalledObject("This book is for Teacher");
          ActivationDesc desc1=new ActivationDesc(id,"BookImpl","http://localhost/download/",paPara1);
          ActivationDesc desc2=new ActivationDesc(id,"BookImpl","http://localhost/download/",paPara2);
          Product pa1=(Product) Activatable.register(desc1);
          Product pa2=(Product) Activatable.register(desc2);
          Context context=new InitialContext();
          context.bind("rmi://product1", pa1);
          context.bind("rmi://product2", pa2);
This is error Mesage:
Exception in thread "main" java.rmi.activation.ActivationException: unable to obtain ActivationSystem; nested exception is:
     java.rmi.ConnectException: Connection refused to host: 125.220.9.55; nested exception is:
     java.net.ConnectException: Connection refused: connect
     at java.rmi.activation.ActivationGroup.getSystem(ActivationGroup.java:453)
     at ProductActivtor.main(ProductActivtor.java:27)
Caused by: java.rmi.ConnectException: Connection refused to host: 125.220.9.55; 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.lookup(Unknown Source)
     at java.rmi.Naming.lookup(Naming.java:84)
     at java.rmi.activation.ActivationGroup.getSystem(ActivationGroup.java:449)
     ... 1 more
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)
     ... 7 more
Can you help me? Thank you very much!!

Answer 1

start rmid
Also you need to do something better with your activatable references than just bind them. You need to serialize them to a file so that you can restart the system without redoing the registration.