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enterprise javabeans (ejb) is a server-side software component that encapsulates business logic of an application. ejb is a part of the java ee (enterprise edition) platform and is used to build scalable, distributed, and transactional applications. in this tutorial, we will cover the basics of ejbs, explain the different types of ejbs, and provide code examples for each.

types of ejbs
1. **session beans**: these are used to perform business logic. session beans can be further categorized into:
**stateless session beans**: do not maintain any state between method calls.
**stateful session beans**: maintain state across multiple method calls from the same client.
**singleton session beans**: there is only one instance of this bean per application, and it is shared across all clients.

2. **message-driven beans (mdbs)**: these are used for asynchronous processing and can respond to messages from a message queue.

setting up ejb
to set up an ejb project, you typically need an application server that supports ejb, such as wildfly, glassfish, or payara. you can create an ejb module using maven.

here’s how you can create a simple ejb example using a stateless session bean.

maven project structure
create a maven project with the following structure:


pom.xml
this is a minimal maven configuration file to include dependencies for ejb:


helloservice interface
define the remote interface for the ejb:


helloservicebean implementation
implement the ejb as a stateless session bean:


beans.xml
this file is used to configure the ejb container:


deploying the ejb
to deploy the ejb, you need to package it as a `.jar` file and deploy it to an application server. you can use maven to build the project:


using the ejb
you can access the ejb from a java client application. here's a simple example:


conclusion
in this tutorial, we have covered the basics of ejbs, the different types of ejbs, and provided a simple example of a stateless session bean. you ...

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