km 6 mar

*Software Requirements:*

1. Java Development Kit (JDK) 8 or later
2. Eclipse or NetBeans IDE (optional)
3. JacORB or TAO CORBA implementation
4. Linux operating system (e.g., Ubuntu, Fedora, CentOS)

*Step 1: Install Java Development Kit (JDK)*

Install JDK 8 or later on your Linux system:

```
bash
sudo apt-get install default-jdk (for Ubuntu-based systems)
sudo yum install java-1.8.0-openjdk-devel (for RPM-based systems)
```

*Step 2: Install JacORB or TAO CORBA implementation*

Download and install JacORB or TAO CORBA implementation:

- JacORB: `wget http://www.jacorb.org/download/jacorb-3.9.jar`
- TAO: `wget https://download.dre.vanderbilt.edu/tao/tao-2.2.0.tar.gz`

*Step 3: Create the IDL file*

Create a file called `Hello.idl` with the following content:

```
idl
module HelloApp
{
  interface Hello
  {
    string sayHello();
  };
};
```

*Step 4: Compile the IDL file*

Use the `idlj` compiler to generate the stubs and skeletons:

```
bash
idlj -fclient -fserver Hello.idl
```

*Step 5: Implement the server*

Create a file called `HelloImpl.java` with the following content:

```
import HelloApp.*;
import org.omg.CORBA.*;

public class HelloImpl extends HelloPOA
{
  public String sayHello()
  {
    return "Hello, world!";
  }
}
```

*Step 6: Create the server*

Create a file called `HelloServer.java` with the following content:

```
import HelloApp.*;
import org.omg.CORBA.*;

public class HelloServer
{
  public static void main(String[] args)
  {
    try
    {
      ORB orb = ORB.init(args, null);
      HelloImpl helloImpl = new HelloImpl();
      orb.connect(helloImpl);
      String[] args2 = new String[] {"-ORBInitialPort", "1050"};
      NamingContextExt namingContext = NamingContextExtHelper.narrow(orb.resolve_initial_references("NameService"));
      namingContext.bind("Hello", helloImpl._this());
      System.out.println("Hello server ready...");
      orb.run();
    }
    catch (Exception e)
    {
      System.out.println("Error: " + e.getMessage());
    }
  }
}
```

*Step 7: Implement the client*

Create a file called `HelloClient.java` with the following content:

```
import HelloApp.*;
import org.omg.CORBA.*;

public class HelloClient
{
  public static void main(String[] args)
  {
    try
    {
      ORB orb = ORB.init(args, null);
      String[] args2 = new String[] {"-ORBInitialPort", "1050"};
      NamingContextExt namingContext = NamingContextExtHelper.narrow(orb.resolve_initial_references("NameService"));
      Hello hello = HelloHelper.narrow(namingContext.resolve_str("Hello"));
      System.out.println(hello.sayHello());
    }
    catch (Exception e)
    {
      System.out.println("Error: " + e.getMessage());
    }
  }
}
```

*Step 8: Compile and run the application*

Compile the server and client files:

```
bash
javac *.java
```

Run the server:

```
bash
java HelloServer -ORBInitialPort 1050
```

Run the client:

```
bash
java HelloClient -ORBInitialPort 1050
```

The client should print "Hello, world!" to the console.