Unexpected RMI problem

Question

Hi,
I have unexpected problem with RMI.
I wrote an application with several server modules and client modules.
Two server modules use RMI to expose their methods for client and reciprocal exchange. These servers are in the same directory and use the same RMI service. One server starts before other and lunch RMI service. After that it binds its methods. The second server get RMI service , search methods of first server and bind its methods.
The first time that servers started, they ran correctly for months.
When I stopped servers for maintenance of other module, without change servers, I had the problem.
First server started correctly and RMI started correctly too. When second server started, it ran correctly but first server hangs without errors from RMI. I tried to start servers for an hours but nothing changed.
After 12 hours I tried to start servers and they ran correctly at first trial.
My questions are: why the same code has this different behaviour? What was it changed in those 12 hours?
Code:
Server1: main
Registry registry = null;
try {
registry = LocateRegistry.createRegistry(Integer.valueOf(Port));
} catch (RemoteException e) {
          e.printStackTrace();
Server1MethodInterface server1RMIinterface = (server1MethodInterface) UnicastRemoteObject.exportObject(server1RMI,Integer.parseInt(portRMI));
registry.rebind("server1RMI", server1RMIinterface);
end main
Server2: constructor
try {
     registry = LocateRegistry.getRegistry(ipServer1,Integer.parseInt(Server1RegistryPort.trim()));
server1MethodInterface = (server1MethodInterface)registry.lookup("server1RMI ");
} catch (RemoteException e) {
     e.printStackTrace();
Main
Server2 server2 = new Server2 (filePath);
CheckLogin serverLogin = new CheckLogin(filePath, server2);
LoginInterface loginInterface = (LoginInterface) UnicastRemoteObject.exportObject(serverLogin, server2.getPortRMI());
server2.registry.rebind("Login", loginInterface);
Communication communications = new Communication(server2);
CommunicationsInterface communicationInterface = (CommunicationsInterface) UnicastRemoteObject.exportObject(communications, server2.getPortaRMI());
server2.registry.rebind("Communications", communicationInterface);
……….

Answer 1

Hi,
I have unexpected problem with RMI.
I wrote an application with several server modules and client modules.
Two server modules use RMI to expose their methods for client and reciprocal exchange. These servers are in the same directory and use the same RMI service. One server starts before other and lunch RMI service. After that it binds its methods. The second server get RMI service , search methods of first server and bind its methods.
The first time that servers started, they ran correctly for months.
When I stopped servers for maintenance of other module, without change servers, I had the problem.
First server started correctly and RMI started correctly too. When second server started, it ran correctly but first server hangs without errors from RMI. I tried to start servers for an hours but nothing changed.
After 12 hours I tried to start servers and they ran correctly at first trial.
My questions are: why the same code has this different behaviour? What was it changed in those 12 hours?
Code:
Server1: main
Registry registry = null;
try {
registry = LocateRegistry.createRegistry(Integer.valueOf(Port));
} catch (RemoteException e) {
          e.printStackTrace();
Server1MethodInterface server1RMIinterface = (server1MethodInterface) UnicastRemoteObject.exportObject(server1RMI,Integer.parseInt(portRMI));
registry.rebind("server1RMI", server1RMIinterface);
end main
Server2: constructor
try {
     registry = LocateRegistry.getRegistry(ipServer1,Integer.parseInt(Server1RegistryPort.trim()));
server1MethodInterface = (server1MethodInterface)registry.lookup("server1RMI ");
} catch (RemoteException e) {
     e.printStackTrace();
Main
Server2 server2 = new Server2 (filePath);
CheckLogin serverLogin = new CheckLogin(filePath, server2);
LoginInterface loginInterface = (LoginInterface) UnicastRemoteObject.exportObject(serverLogin, server2.getPortRMI());
server2.registry.rebind("Login", loginInterface);
Communication communications = new Communication(server2);
CommunicationsInterface communicationInterface = (CommunicationsInterface) UnicastRemoteObject.exportObject(communications, server2.getPortaRMI());
server2.registry.rebind("Communications", communicationInterface);
……….