EJB 3.0 Tutorials

This tutorial gradually takes a new comer to master EJB along with learning the updated JEE specifications using glass-fish server. Tutorials provided are easy to grasp and subsequently shift onto the practical implementations. 

1. Introduction to Application Server
   Application server was developed to support for developing the enterprise applications for security and state maintenance with the data base and persistence.
      
2. What is EJB-Container?
   Transaction Management
   Security
   Resource and life cycle management
   Remote Accessibility 
   Concurrency control
   Clustering and load-balancing 
     
3. Enterprise Beans
   What is an enterprise bean
   Benefits of enterprise beans
   When to use enterprise beans
   Types of enterprise beans
    
4. Features of EJB 3.0
   Elimination of Home and Remote Interfaces
   Elimination of Component Interface
   Simplified Access to Environment
   Dependency Injection
   EJB Context
   Enhanced Lifecycle Methods and Callback Listener Classes
   Interceptors
   Simple JNDI lookup of EJB
     
5. Annotations
   To make the development easier and execution of the programs fast and efficient sun micro system added the features like annotation in jdk 5. The main objectives behind the development of annotations is to make the development easier. Annotations behaves like the meta
     
6. Session Beans
   What is a session bean
   Types of session beans
   Stateless Session Bean
   Stateful session bean
   When to use session bean
   Life Cycle of Stateless session
   Life Cycle of Stateful session bean
    
7. Getting Started Examples with Enterprise Session Beans
   
   • Stateless Session Bean Example
   • Statelful Session Bean Example
       
8. Message Driven Beans
   Motivations for messaging
   Non blocking request processing
   Decoupling
   Reliability
   Support for multiple senders and receivers
   Java Message Services (JMS)
   JMS API
   JMS Architecture
   Integrating JMS with EJB
   Using a Java Object that receives the JMS messages to call EJB client
   Reuse an existing type of EJB component somehow to receive JMS messages
   Message driven bean
      
9. A Message-Driven Bean Example
   To receive messages asynchronously,  a Message-driven bean is used. Message driven beans are the light weight components used for communication via messages (e.g., email or IM messages).
     
10. Introduction to POJO (Plain Old Java Object) 
    One of the new features of added by Sun Microsystems in EJB 3.0 is POJO (Plain Old Java Object). It is a Java object that doesn't implement any special interfaces require by the EJB framework.  
      
11. Java Persistence API
    Java Persistence API is the standard API used for the management of the persistent data and object/relational mapping. Java Persistence API is added in Java EE 5 platform. Every application server compatible with Java EE 5 supports the Java Persistent APIs.
     
    Features of JPA
    Advantages of JPA
    Domain Model:
    The Basics of EJB3 JPA and O-R Framework:
    Metedata Annotation in Action
    Entities
    Requirements of Entity Classes
    Persistence Fields and Properties in Entity Classes
    Persistence Fields
    Persistent Properties
    Primary Keys in Entities
    Primary Key Classes
    Multiplicity in Entity Relationships
    Direction in Entity Relationships
    Queries and Relationship Direction
    Cascade Deletes and Relationships
    Entity Inheritance
    Abstract Entities
    Mapped Superclasses
    Non-Entity Superclasses
    Entity Inheritance Mapping Strategies
    Single Table per Class Hierarchy Strategy
      
12. A Java Persistence Example
    In the Book catalog example, we define a Book entity bean class. The bean has three properties (title, author and price) to model a Book product. The id property is used to uniquely identify the Book bean instance by the EJB3 container. The id value is automatically generated when the bean is saved to the database.  
      
13. Web Services
    Web services are the mechanism to develop a Service-Oriented-Architecture (SOA). SOA is an architectural approach for designing large scale distributed systems to integrate heterogeneous application on the service interfaces. 
     
    WSDL
    SOAP
    Implementing Web Services
    Packaging and Deploying a Web Service Session Bean
    Implementing a Web Service Client
     
14. EJB remote interface
    The program given below describes  the way of creating a remote interface in EJB. The meaning of Remote interface in terms of Ejb is the java source file which contain the bean implementation logic.
      
15. Ejb message driven bean
    This tutorial explains you the process which are involved in making a message driven bean using EJB.
     
16. EJB lookup example
    Bean30Remote.java:-This  is the Remote interface which extends javax.ejb.EJBObject package. These are similar to RMI Remote interface.
      
17. EJB life cycle method
    The various stages through which an enterprise bean go through its lifetime is known as the life cycle of EJB. Each type of enterprise bean has different life cycle.
      
18. EJB Interfaces
    Remote interface are the interface that has the methods that relate to a particular bean instance. In the Remote interface we have all get methods as given below in the program.
      
19. EJB Insert data
    This is the Remote Interface for the Bean. Here we have used  @Remote annotation to declare the class as a Remote Interface.
     
20. EJB deployment descriptor
    Deployment descriptor is the file which tells the EJB server that which classes make up the bean implementation, the home interface and the remote interface.
     
21. EJB create method
    In this tutorial we are describing you about the EJB create method. The create() method is used for creating the EJBean.
     
22. EJB container services
    The EJB container is a container that deploys EJB automatically when Web Server is started. All of the entity objects live in container during its creation to removal.
      
23. EJB Hello world example
    Creating and testing the "Hello World" Example is the very first step towards learning of any application or programming language.
      
24. EJB directory structure
    The tutorial is going to explain the standard directory structure of an EJB application. The figure given below is taken of Netbeans IDE. Here in the  given figure NewsApp is the application name of the project which we have created.
      
25. Deleting a Row from SQL Table Using EJB
    In the given example of Enterprise Java Bean, we are going to delete a row from the SQL Table. Find out the steps given below that describes how to delete a particular row from the database table using EJB.
      
26. Accessing Database using EJB
    This is a simple EJB Application that access the database. Just go through the EJB example given below to find out the steps involved in accessing Database.

EJB 2.0 Tutorials

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Comments

Ajinkya
September 28, 2011
J2EE

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The most awesomest explanation ever for a beginner..I am the founder of a club where we learn new concepts and teach them to college students..i am gonna recommend every1 in the club to join this site..

sivakumar
September 29, 2011
how to connect

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how to connect java file to jsp file (or) how to link java file into jsp file

renu
November 10, 2011
how to combine ejb with jsf

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hello, i want to know how we can combine ejb3 with jsf2

Henri SHABANI
November 24, 2011
Java

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Good

Nikhil
March 12, 2013
tp

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hin whats your name?

suman
January 2, 2012
ejb

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Im unble to compile client prg in ejb app .even after setting path to jar file , folder in which inerfaces are present i am still not able to compile client prg.plz tell me how to rectify this problem

waseem
March 21, 2012
EJB 3.0 Tutorials : Contents missing

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Hi, In EJB 3.0 Tutorials there is many hyper-link. when ever i am clicking on link. I can only see the ad's actual content is missing. I have tried on IE and chrome but no luck. Thanks, Waseem

vipin
May 28, 2012
elimination of component and home interface

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Hi, I am new to EJB and in my process of learning i learn't that the whole interaction between application client and EJB happens in the below format. Application client -> Home Interface(EJB Home) -> Component Interface(EJB Object) -> Business methods of EJB. Now yesterday while i was going through one of the forum i could see the below statement: Elimination of Home and Remote Interfaces in EJB 3.o and replaced by business interface. Does this mean in EJB 3.o there is no Home Interface and Component Interface at all in the whole flow of interaction or anywhere. How does the new flow of interaction between application client and EJB happen in EJB 3.o Thanks in Advance, Vipin.