How to make an arraylist remotely accessible

Question

I have a project where I am using Java RMI to make objects remotely accessible to other objects. I need to make the following class remote:

public interface MarketBB extends Remote
{
   public ArrayList<CloudEntry> getMarketBB() throws RemoteException; 
   public void moveAMP(int fromCloud, int toCloud) throws RemoteException;
}

The problem that I have is that because the ArrayList is holding CloudEntry objects, when the getMarketBB method is called from another object, nothing is returned.

Is there a way of making the ArrayList of CloudEntry classes remotely accessible?

Here is the code for the CloudEntry class:

public class CloudEntryImpl implements CloudEntry {

    int cloudId;
    String cloudName;
    double speedGHz;
    double costPerGhzH;
    double commsCost;
    double commsTime;
    int noAMPs;

    //constructor, get and set methods for fields

}

And the CloudEntry interface:

public interface CloudEntry extends Remote {

    public void setNoAmps(int noAmps) throws RemoteException;

    public String getCloudName() throws RemoteException;

    public String getCloudDetails() throws RemoteException;

}

Answer 1

Your CloudEntryImpl is not serializable. Try changing it to:

public class CloudEntryImpl extends UnicastRemoteObject implements CloudEntry {
    //...
}