VTU Distributed Computing Lab - Program 2 (EJB)

2. Design and implement EJB (Enterprise Java Beans) session bean business logic to calculate income tax and invoke the service using stub, i.e., client side proxy object.

Categories -> java and select Java Class Library and click on next

Provide name it-remote click on finish

Then screen window appears:

Create new Project:

In categories select Java EE and select Enterprise Application in Projects  

Click on next

Unselect the Create web Application Module and click on finish

Then the following project will be created in the work space…

Right click on it-sb-eap2-ejb -> new Session Bean

Provide EJB Name:

Do the following:

EJB Name: ITService

Package: ejb

Session Type:

Select only: Stateless

Create Interface:

Select only: Remote in Project

Click on Finish

Then following screen appears:

Right click on “ITService” class and click Insert Code

Select Add Business Method

Provide:

Name: calculateTax

Return Type: double

Click on Add 3 times

Change the name, type of the parameters and mark all variables as final

Note: you may get error, if it happens click on Save button

Give the implementation for “calculateTax( )” method.

Add new method to get slabRates:

Write your logic to return tax percentage based on given input.

Finally the class “ITService”  looks:

We are done with Server side.

Client Project:

Create new Project ->  Java EE -> Enterprise Application Client

Click on Next

Click on Next

Click on Finish

Right click -> Insert Code

Select Call To Enterprise Bean

Select the Project

Click on OK

Create inner class in Main:

Create constructor TaxInformation class

Right-click -> insert code ( TaxInformation class)-> Constructor…

Select all the fields

Click on Generate.

Then inner class looks

Invoke the it calculateTax method by using itService (main method)

To display information:

We are done with client.

To Run the application:

Rght-click on “it-sb-eap2” and run

Application is deployed successful, now run the client class

Right-click on “it-sb-client” and run:

Then output on the console looks: