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Session Beans implementation analysis

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implementation implementation

EJB implementation may vary from one vendor to another. The purpose of this section is to provide a session bean specific feature-to-feature comparison between JBoss and Apache Geronimo so you can clearly identify the differences and plan accordingly before migration.

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Sample application

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sampleApp sampleApp

This sample application shows how session beans are used and deployed in a container. There are two clients, one for stateless session beans and another for stateful session beans. Both client applications use the same database which contains a table that stores loan application details. An entity bean is used to connect to and operate on the loan details table. A session bean is then used by the client application to get specific details from the database using the entity bean. The first client creates a stateless session bean and displays a list of denied loan applications via a method defined in that EJB. The second client creates a stateful session bean and adds loan applications to the database.

The following figure illustrates the application flow:

Application Beans

The session bean sample application consists of the following packages:

• com.ibm.demo.entity
  • CustomerBean - contains the methods that connect to the database and operations to manipulate the data.
  • CustomerHomeRemote - the remote interface for the EJB.
  • CustomerHomeRemote - EJBHome Interface.

• com.ibm.demo.session.stateful
  • StatefulLoanManagerBean - it has the submitLoanApplication() method that saves new customer loan applications to the database as well as the getSubmitCount() method that returns the number of loans submitted; since this bean is a stateful session bean, it can remember connection details from a session so the loan application submit count is retained for every call to the submitLoanApplication() method.
  • StatefulLoanManagerRemote - the remote interface for the EJB.
  • StatefulLoanManagerHomeRemote - EJBHome Interface.

• com.ibm.demo.session.stateless
  • LoanManagerBean -it has the deniedLoans() method that is used to get a list of all customers whose loan applications are denied based on the condition that their Annual Salary to Loan Amount ratio is less than 0.1
  • LoanManagerRemote - the remote interface for the EJB.
  • LoanManagerHomeRemote - EJBHome Interface.

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The JBoss environment

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JBoss JBoss

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