Activatable object must provide an activation constructor error

Question

Hi everybody,
while I'm trying to calling a simple activatable object, I got this error
rmi://localhost:1099/MyActivatableServer
Found a reference to the object that extend IMyRemoteInterface and Activatable
Invoking the remote method of this object
RemoteException
java.rmi.activation.ActivateFailedException: activation failed; nested exception is:
     java.rmi.activation.ActivationException: Activatable object must provide an activation constructor; nested exception is:
     java.lang.NoSuchMethodException: Progetto3.MyActivatableServer.<init>(java.rmi.activation.ActivationID, java.rmi.MarshalledObject)
     at sun.rmi.server.ActivatableRef.activate(ActivatableRef.java:285)
     at sun.rmi.server.ActivatableRef.invoke(ActivatableRef.java:114)
     at Progetto3.MyActivatableServer_Stub.chiamamiInRemoto(Unknown Source)
     at Progetto3.Client.run(Client.java:52)
     at Progetto3.Client.main(Client.java:78)
Caused by: java.rmi.activation.ActivationException: Activatable object must provide an activation constructor; nested exception is:
     java.lang.NoSuchMethodException: Progetto3.MyActivatableServer.<init>(java.rmi.activation.ActivationID, java.rmi.MarshalledObject)
     at sun.rmi.server.ActivationGroupImpl.newInstance(ActivationGroupImpl.java:273)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
     at sun.rmi.transport.Transport$1.run(Transport.java:153)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
     at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
     at java.lang.Thread.run(Thread.java:595)
     at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
     at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)
     at java.rmi.activation.ActivationGroup_Stub.newInstance(Unknown Source)
     at sun.rmi.server.Activation$ObjectEntry.activate(Activation.java:1277)
     at sun.rmi.server.Activation$GroupEntry.activate(Activation.java:972)
     at sun.rmi.server.Activation$ActivatorImpl.activate(Activation.java:243)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
     at sun.rmi.transport.Transport$1.run(Transport.java:153)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
     at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
     at java.lang.Thread.run(Thread.java:595)
     at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
     at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:126)
     at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:179)
     at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:132)
     at $Proxy0.activate(Unknown Source)
     at java.rmi.activation.ActivationID.activate(ActivationID.java:96)
     at sun.rmi.server.ActivatableRef.activate(ActivatableRef.java:258)
     ... 4 more
Caused by: java.lang.NoSuchMethodException: Progetto3.MyActivatableServer.<init>(java.rmi.activation.ActivationID, java.rmi.MarshalledObject)
     at java.lang.Class.getConstructor0(Class.java:2647)
     at java.lang.Class.getDeclaredConstructor(Class.java:1953)
     at sun.rmi.server.ActivationGroupImpl$1.run(ActivationGroupImpl.java:228)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.server.ActivationGroupImpl.newInstance(ActivationGroupImpl.java:222)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
     at sun.rmi.transport.Transport$1.run(Transport.java:153)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
     at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
     at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
     at java.lang.Thread.run(Thread.java:595)
I can't figure out what constructor it need, because there is already a default constructor in the remote object implementation.
do anybody have an idea?
I'm going to post the program code in the reply.

Answer 1

here is the client code
public class Client implements Runnable {
     private String server;
     private long ms;
     private String msg;
     public Client(String server, long ms, String msg) {
          //server address
          this.server = server;
          //time in ms need for the activatable object
          this.ms = ms;
          //the message to print out
          this.msg = msg;
          public void run() {
          //create a securitymanager
          System.setSecurityManager(new RMISecurityManager());
         try {
               String location = "rmi://" + server + "/MyActivatableServer";
               System.out.println(location);
               //lookup on server
               IMyRemoteInterface mri = (IMyRemoteInterface)Naming.lookup(location);
               System.out.println("Found a reference to the object that extend IMyRemoteInterface and Activatable ");
               int risultato = 0;
               System.out.println("Invoking the remote method of this object");
                //call the method "chiamamiInRemoto" of the remote activatable object
               risultato = mri.chiamamiInRemoto(ms, msg);
               System.out.println("Fine dell'invocazione remota");
               if (risultato != 0)
                    System.out.println("ok");
               else
                    System.out.println("no ok");
          } catch (MalformedURLException e) {
               System.out.println("MalformedUrlException");
               e.printStackTrace();
          } catch (RemoteException e) {
               System.out.println("RemoteException");
               e.printStackTrace();
          } catch (NotBoundException e) {
               System.out.println("NotBoundException");
               e.printStackTrace();
          } catch (AccessControlException e){
               System.out.println("AccessControlException");
               e.printStackTrace();
          } catch (Exception e){
               System.out.println("Other Exception");
               e.printStackTrace();
     public static void main(String[] args) {
          Client cliente = new Client("localhost:1099",150,"hello");
          cliente.run();
}the server interface that the activatable implements is simply
public interface IMyRemoteInterface extends Remote {
     public int chiamamiInRemoto(long ms, String msg) throws RemoteException;
}and the activatable object's implementation is
public class MyActivatableServer extends Activatable implements IMyRemoteInterface {
     //il threadpool per gestire le chiamate arrivate
     private final ExecutorService pool;
     //per accedere al variabile indice, bisogna prima sincronizzarsi su questo lock
     private Object objLock;
     //un indice che tiene conto di quanti thread sono stati creati per gestire l'invocazione del client
     private int indice;
     public MyActivatableServer(ActivationID id, int data)
               throws RemoteException {
          super(id, data);
          objLock = new Object();
          indice = 1;
          //il pool creato � di tipo CachedThreadPool, che aggiunge un nuovo thread al pool
          //nel caso in cui i thread presenti non siano disponibili per una nuova chiamata.
          pool = Executors.newCachedThreadPool();
     public int chiamamiInRemoto(long ms, String msg)
          throws RemoteException {
//doing something here and return an Integer number
}the setup java file is
public class MyActivatableServerSetup {
     public static void main(String[] args) {
          System.setSecurityManager(new RMISecurityManager());
          //create an instance of ActivationGroup
          Properties props = new Properties();
          props.put("java.security.policy","d:\\policy");
          System.out.println(props.getProperty("java.security.policy"));
          ActivationGroupDesc.CommandEnvironment ace = null;
          ActivationGroupDesc ActivationGruppo = new ActivationGroupDesc(props, ace);
          try {
               //registration
               ActivationGroupID agID = ActivationGroup.getSystem().registerGroup(ActivationGruppo);
               //location define l'URL where class are
               String location = "file:///d:\\progetti\\Progetto\\bin\\";
               //Other parameters need for the constructor of ActivationDesc
               MarshalledObject data = null;
               ActivationDesc desc = new ActivationDesc(agID,"Progetto3.MyActivatableServer",location,data);
               //Registration to rmid
               IMyRemoteInterface mri = (IMyRemoteInterface)Activatable.register(desc);
               System.out.println("obtain stub for MyActivatableServer");
               //Bind the stub
               Naming.rebind("MyActivatableServer", mri);
               System.out.println("Esportato MyActivatableServer");
          } catch (RemoteException e) {
               System.out.println("RemoteException al Setup");
               e.printStackTrace();
          } catch (UnknownGroupException e) {
               System.out.println("UnknownGroupException al Setup");
               e.printStackTrace();
          } catch (MalformedURLException e) {
               System.out.println("MalformedURLException al Setup");
               e.printStackTrace();
          } catch (ActivationException e) {
               System.out.println("ActivationException al Setup");
               e.printStackTrace();
          System.exit(0);
}I can start the rmiregistry and rmid without problem, I can't esecute the setup of activatable object without problem, but when I try esecuting the client, the activation constructor error appear.
I really can't figure out what is this constructor, doesn't I already implemented in my activatableServer yet? with public MyActivatableServer(ActivationID id, int data)
               throws RemoteException {thanks in advance for everybody.