# java.rmi.registry

***

**1. Creating and Binding a Remote Object to the Registry**

```java
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;

public class Server {

    public static void main(String[] args) {
        try {
            // Create a remote object
            MyRemoteObject remoteObject = new MyRemoteObject();

            // Create and start a registry on port 1099
            Registry registry = LocateRegistry.createRegistry(1099);

            // Bind the remote object to the registry with the name "MyRemoteObject"
            registry.bind("MyRemoteObject", remoteObject);

            System.out.println("Remote object bound to the registry");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static class MyRemoteObject implements RemoteInterface {

        @Override
        public String sayHello(String name) {
            return "Hello, " + name;
        }
    }
}
```

**2. Looking Up a Remote Object from the Registry**

```java
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class Client {

    public static void main(String[] args) {
        try {
            // Create and start a registry on port 1099
            Registry registry = LocateRegistry.getRegistry(1099);

            // Look up the remote object bound to the name "MyRemoteObject"
            RemoteInterface remoteObject = (RemoteInterface) registry.lookup("MyRemoteObject");

            // Invoke a method on the remote object
            String message = remoteObject.sayHello("John");

            System.out.println("Message received from remote object: " + message);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private interface RemoteInterface extends Remote {

        String sayHello(String name) throws RemoteException;
    }
}
```

**3. Using a Server Socket Factory to Customize Server Socket Creation**

```java
import java.net.ServerSocket;
import java.net.ServerSocketFactory;
import java.rmi.registry.Registry;
import java.rmi.registry.LocateRegistry;

public class ServerWithServerSocketFactory {

    public static void main(String[] args) {
        try {
            // Create a custom server socket factory
            ServerSocketFactory socketFactory = new MyServerSocketFactory();

            // Create and start a registry using the custom socket factory
            Registry registry = LocateRegistry.createRegistry(1099, null, socketFactory);

            // Bind a remote object to the registry
            registry.bind("MyRemoteObject", new MyRemoteObject());

            System.out.println("Remote object bound to the registry");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static class MyRemoteObject implements RemoteInterface {

        @Override
        public String sayHello(String name) {
            return "Hello, " + name;
        }
    }

    private static class MyServerSocketFactory extends ServerSocketFactory {

        @Override
        public ServerSocket createServerSocket(int port) throws IOException {
            // Customize the server socket creation here
            return new ServerSocket(port);
        }
    }
}
```

**4. Using a Registry Handler to Customize Registry Behavior**

```java
import java.rmi.registry.Registry;
import java.rmi.registry.RegistryHandler;

public class CustomRegistryHandler implements RegistryHandler {

    @Override
    public Registry createRegistry(int port) throws RemoteException {
        // Customize the registry creation here
        return new MyRegistry(port);
    }

    private static class MyRegistry extends Registry {

        public MyRegistry(int port) throws RemoteException {
            super(port);
        }

        @Override
        public RemoteLookup getRegistryServer() {
            // Customize the registry server here
            return new MyRegistryServer();
        }
    }

    private static class MyRegistryServer extends RegistryServer {

        public MyRegistryServer() {
            super();
        }

        @Override
        public boolean bind(String name, Remote object, boolean rebind) {
            // Customize the binding logic here
            return super.bind(name, object, rebind);
        }
    }
}
```

**5. Using a UnicastRemoteObject Stub for Remote Object Exports**

```java
import java.rmi.server.UnicastRemoteObject;
import java.rmi.registry.Registry;
import java.rmi.registry.LocateRegistry;

public class ServerWithUnicastRemoteObjectStub {

    public static void main(String[] args) {
        try {
            // Create a registry on port 1099
            Registry registry = LocateRegistry.getRegistry(1099);

            // Create a remote object and export it using UnicastRemoteObject
            MyRemoteObject remoteObject = new MyRemoteObject();
            RemoteInterface stub = (RemoteInterface) UnicastRemoteObject.exportObject(remoteObject, 0);

            // Bind the stub to the registry
            registry.bind("MyRemoteObject", stub);

            System.out.println("Remote object exported and bound to the registry");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static class MyRemoteObject implements RemoteInterface {

        @Override
        public String sayHello(String name) {
            return "Hello, " + name;
        }
    }
}
```

**6. Using a UnicastRemoteObject Exporter for Remote Object Exports**

```java
import java.rmi.server.UnicastRemoteObject;
import java.rmi.registry.Registry;
import java.rmi.registry.LocateRegistry;

public class ServerWithUnicastRemoteObjectExporter {

    public static void main(String[] args) {
        try {
            // Create a registry on port 1099
            Registry registry = LocateRegistry.getRegistry(1099);

            // Create a remote object and export it using UnicastRemoteObject with a custom exporter
            UnicastRemoteObjectExporter exporter = new MyUnicastRemoteObjectExporter();
            MyRemoteObject remoteObject = new MyRemoteObject();
            RemoteInterface stub = (RemoteInterface) exporter.exportObject(remoteObject, 0);

            // Bind the stub to the registry
            registry.bind("MyRemoteObject", stub);

            System.out.println("Remote object exported and bound to the registry using a custom exporter");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static class MyRemoteObject implements RemoteInterface {

        @Override
        public String sayHello(String name) {
            return "Hello, " + name;
        }
    }

    private static class MyUnicastRemoteObjectExporter extends UnicastRemoteObjectExporter {

        public MyUnicastRemoteObjectExporter() {
            super();
        }

        @Override
        public Remote toStub(Remote obj) {
            // Customize the stub creation here
            return super.toStub(obj);
        }
    }
}
```

**7. Using a custom object factory for registry lookups**

```java
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.registry.RegistryHandler;

public class ServerWithCustomObjectFactory {

    public static void main(String[] args) {
        try {
            // Create a custom object factory
            MyObjectFactory factory = new MyObjectFactory();

            // Create and start a registry with the custom object factory
            RegistryHandler handler = new MyRegistryHandler(factory);
            Registry registry = LocateRegistry.createRegistry(1099, null, handler);

            // Bind a remote object to the registry
            registry.bind("MyRemoteObject", new MyRemoteObject());

            System.out.println("Remote object bound to the registry with a custom object factory");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static class MyObjectFactory implements RegistryHandler {

        @Override
        public Registry createRegistry(int port) throws RemoteException {
            // Customize the registry creation here
            return new MyRegistry(port);
        }

        private static class MyRegistry extends Registry {

            public MyRegistry(int port) throws RemoteException {
                super(port);
            }

            @Override
            public Remote lookup(String name) throws RemoteException, NotBoundException {
                // Customize the lookup logic here
                return super.lookup(name);
            }
        }
    }

    private static class MyRemoteObject implements RemoteInterface {

        @Override
        public String sayHello(String name) {
            return "Hello, " + name;
        }
    }
}
```

**8. Using a custom socket factory for registry connections**