# org.omg.CORBA\_2\_3

***

**1. Create and Initialize an ORB**

```java
import org.omg.CORBA.ORB;

public class ORBExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        // Use the ORB to perform operations...
        // ...

        // Shutdown the ORB when done
        orb.shutdown(false);
    }
}
```

**2. Create and Register an Object Reference**

```java
import org.omg.CORBA.ORB;
import org.omg.CORBA.Object;

public class ObjectReferenceExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        // Create an object reference
        Object objRef = orb.string_to_object("MyObject");

        // Register the object reference with the ORB
        orb.register_initial_reference("MyObject", objRef);

        // Use the object reference to perform operations...
        // ...

        // Release the object reference
        objRef.release();
    }
}
```

**3. Create and Invoke a Method on a Remote Object**

```java
import org.omg.CORBA.ORB;
import org.omg.CORBA.Object;

public class MethodInvocationExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        // Create an object reference
        Object objRef = orb.string_to_object("MyObject");

        // Invoke a method on the remote object
        String result = (String) objRef.invoke("myMethod", new Any[0], new Any[0]);

        // Print the result
        System.out.println(result);
    }
}
```

**4. Handle Exceptions in CORBA**

```java
import org.omg.CORBA.ORB;
import org.omg.CORBA.ExceptionList;

public class ExceptionHandlingExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        try {
            // Perform operations using the ORB...
            // ...
        } catch (Exception e) {
            // Handle the exception
            ExceptionList exceptions = e.exception_list();
            for (int i = 0; i < exceptions.count(); i++) {
                System.out.println(exceptions.item(i).id());
            }
        } finally {
            // Shutdown the ORB
            orb.shutdown(false);
        }
    }
}
```

**5. Use the IDL Compiler to Generate Java Stubs and Skeletons**

```java
import org.omg.CosNaming.NameComponent;
import org.omg.CosNaming.NamingContext;
import org.omg.CosNaming.NamingContextHelper;
import org.omg.CORBA.ORB;
import org.omg.CORBA.Object;

public class IDLCompilerExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        // Get the root naming context
        NameComponent[] name = new NameComponent[1];
        name[0] = new NameComponent("root", "");
        Object obj = orb.resolve_initial_references("NameService");
        NamingContext rootCtx = NamingContextHelper.narrow(obj);

        // Create a new object
        MyObjectImpl myObjectImpl = new MyObjectImpl();

        // Register the object with the naming service
        NameComponent[] objName = new NameComponent[1];
        objName[0] = new NameComponent("MyObject", "");
        rootCtx.rebind(objName, myObjectImpl);

        // Wait for clients to connect
        orb.run();
    }
}
```

**6. Use the ORB to Create a Client**

```java
import org.omg.CosNaming.NameComponent;
import org.omg.CosNaming.NamingContext;
import org.omg.CosNaming.NamingContextHelper;
import org.omg.CORBA.ORB;
import org.omg.CORBA.Object;

public class ORBClientExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        // Get the root naming context
        NameComponent[] name = new NameComponent[1];
        name[0] = new NameComponent("root", "");
        Object obj = orb.resolve_initial_references("NameService");
        NamingContext rootCtx = NamingContextHelper.narrow(obj);

        // Look up the object in the naming service
        NameComponent[] objName = new NameComponent[1];
        objName[0] = new NameComponent("MyObject", "");
        Object objRef = rootCtx.resolve(objName);

        // Use the object reference to perform operations
        MyObject myObject = MyObjectHelper.narrow(objRef);
        myObject.myMethod();
    }
}
```

**7. Use the ORB to Create a Server**

```java
import org.omg.CosNaming.NameComponent;
import org.omg.CosNaming.NamingContext;
import org.omg.CosNaming.NamingContextHelper;
import org.omg.CORBA.ORB;
import org.omg.CORBA.Object;

public class ORBServerExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        // Create a new object
        MyObjectImpl myObjectImpl = new MyObjectImpl();

        // Get the root naming context
        NameComponent[] name = new NameComponent[1];
        name[0] = new NameComponent("root", "");
        Object obj = orb.resolve_initial_references("NameService");
        NamingContext rootCtx = NamingContextHelper.narrow(obj);

        // Register the object with the naming service
        NameComponent[] objName = new NameComponent[1];
        objName[0] = new NameComponent("MyObject", "");
        rootCtx.rebind(objName, myObjectImpl);

        // Wait for clients to connect
        orb.run();
    }
}
```

**8. Use the Portable Object Adapter (POA)**

```java
import org.omg.PortableServer.POA;
import org.omg.PortableServer.POAHelper;
import org.omg.PortableServer.Servant;
import org.omg.CORBA.ORB;

public class POAExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        // Create a root POA
        POA rootPOA = POAHelper.narrow(orb.resolve_initial_references("RootPOA"));

        // Create a servant
        MyServant myServant = new MyServant();

        // Activate the servant with the root POA
        byte[] oid = rootPOA.activate_object(myServant);

        // Get the object reference for the servant
        Object objRef = rootPOA.id_to_reference(oid);

        // Use the object reference to perform operations
        // ...

        // Deactivate the servant
        rootPOA.deactivate_object(oid);
    }
}
```

**9. Use the Dynamic Invocation Interface (DII)**

```java
import org.omg.CORBA.ORB;
import org.omg.CORBA.Object;
import org.omg.Dynamic.Parameter;
import org.omg.Dynamic.ParameterList;
import org.omg.Dynamic.Request;
import org.omg.Dynamic.Response;
import org.omg.Dynamic.InvocationDescription;

public class DIIExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        // Create an object reference
        Object objRef = orb.string_to_object("MyObject");

        // Get the invocation description for the method
        String methodName = "myMethod";
        InvocationDescription invDesc = objRef._get_interface().get_description().lookup(methodName);

        // Create a request object
        Request req = objRef._request(methodName, invDesc);

        // Set the parameters for the request
        ParameterList paramList = req.arguments();
        Parameter param = paramList.item(0);
        param.value(new Any(42));

        // Invoke the method
        Response resp = objRef._invoke(methodName, invDesc, req);

        // Get the result from the response
        ParameterList resultParamList = resp.arguments();
        Parameter resultParam = resultParamList.item(0);
        int result = ((Integer) resultParam.value()).intValue();

        // Print the result
        System.out.println(result);
    }
}
```

**10. Use the Asynchronous Messaging Service (AMS)**

```java
import org.omg.CORBA.ORB;
import org.omg.Messaging.Message;
import org.omg.Messaging.MessageHelper;
import org.omg.Messaging.ReplyHandler;
import org.omg.Messaging.ReplyHandlerHelper;

public class AMSExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        // Create an asynchronous request
        Message req = MessageHelper.create();
        req.source(orb.resolve_initial_references("AMS"));
        req.reply_to(ReplyHandlerHelper.create(orb.resolve_initial_references("IOP:ReplyHandler")));

        // Set the message body
        Any[] params = new Any[1];
        params[0] = new Any("Hello world!");
        req.params(params);

        // Send the message
        byte[] id = orb.send_message(req);

        // Create a reply handler
        ReplyHandler replyHandler = ReplyHandlerHelper.narrow(req.reply_to());

        // Wait for the reply
        Message reply = replyHandler.get_reply(id);

        // Get the result from the reply
        Any[] results = reply.params();
        String result = (String) results[0].value();

        // Print the result
        System.out.println(result);
    }
}
```

**11. Use the CORBA Event Service (CES)**

```java
import org.omg.CORBA.ORB;
import org.omg.CosEventChannelAdmin.EventChannel;
import org.omg.CosEventChannelAdmin.EventChannelHelper;
import org.omg.CosEventComm.PushSupplier;
import org.omg.CosEventComm.PushSupplierHelper;
import org.omg.CosEventComm.Disconnected;

public class CESExample {

    public static void main(String[] args) {
        // Create an ORB instance
        ORB orb = ORB.init(args, null);

        // Get the event channel
        EventChannel eventChannel = EventChannelHelper.narrow(orb.resolve_initial_references("EventChannel"));

        // Create a push supplier
        PushSupplier pushSupplier = PushSupplierHelper.narrow(eventChannel.for_consumers(null, null, null, null));

        // Connect the push supplier to the event channel
        pushSupplier.connect_push_supplier();

        // Create an event
        Event event = new Event();
        event.data(new Any("Hello world!"));

        // Send the event

```