Java Training Overview
This course introduces the experienced Java developer to Enterprise JavaBeans -- the Java EE standard for scalable, secure, and transactional Java components. EJB 3.0 has reinvigorated this area of Java enterprise development, with dramatic improvements in ease of use and smooth integration with servlet-based or JSF web applications. This course treats the 3.0 specification, with a few notes on 2.1 compatibility but an emphasis on doing things the 3.0 way.
Students get an overview of the EJB rationale and architecture, and then dive right into creating session beans and entities. The new dependency-injection features of EJB3 cause perhaps the most confusion, so we work through a chapter devoted explicitly to DI and JNDI, and basically how components find each other to make an application. We then study entities and the Java Persistence API more deeply, and get a look at message-driven beans as well.
Java Training Learning Objectives
- Understand the role of EJB in the broader Java EE platform.
- Describe the features that are implemented by an EJB container on behalf of application components.
- Build stateless session beans as part of a service layer or SOA.
- Build JPA entities to represent persistent data records within the Java application.
- Develop systems of entities to manage complex data models including 1:1, 1:N, and N:N associations.
- Manage transactional behavior of the application through declarative and programmatic techniques.
- Invoke EJB sessions from Java web applications.
- Use dependency injection and JNDI names to assemble complex web/EJB systems with minimal fuss and maximal flexibility.
- Implement message-driven beans to process queued messages asynchronously.
Java Training Prerequisites
- Solid Java programming skills and understanding of OO Java and Java-5.0 language features is essential. Course "Java Programming " is excellent preparation for this course.
- Experience with developing Java web applications is very helpful for this course, but not strictly required. JavaServer Faces makes an excellent one-week pairing with this course.
- Some knowledge of XML will be useful for writing the occasional deployment descriptor, but is not required. Course "Introduction to XML" is recommended for those who would like to get more familiar with XML before pursuing this course.
Java Training Course duration
3 days.
Java Training Course outline
Chapter 1. Overview
- Enterprise Applications
- Containers and Objects
- Three Containers
- Remote Connectivity
- Scalability and Availability
- Security
- Transaction Control
Chapter 2. Architecture
- What is an EJB?
- Types of Beans
- Inversion of Control
- The Bean-Type Annotations
- Dependency Injection
- The @EJB Annotation
- Development Cycle and Roles
Chapter 3. Session Beans
- Interface/Implementation Split
- Stateful vs. Stateless
- The @Stateless Annotation
- Lifecycle and State Transitions
- Session Context
- The @Stateful Annotation
- State Transitions
- Singletons and Pools
Chapter 4. Entities
- The Java Persistence API
- Persistence Annotations
- Configuration by Exception
- ORM Annotations
- The EntityManager
- Acquiring and Using the EntityManager
- persistence.xml
- @Enumerated and @Temporal Types
Chapter 5. Associations
- Associations, Cardinality, and Ownership
- Annotations
- Unidirectional vs. Bidirectional
- The @Embedded Annotation
Chapter 6. Java Persistence Query Language
- OO Query Languages
- The FROM Clause and Directionality
- The WHERE Clause
- The SELECT Clause
- Joins
- Aggregates and Grouping
- Ordering
Chapter 7. Dependency Injection
- Interdependent Systems
- The Factory Pattern
- The Service Locator Pattern
- Dependency Injection
- Injection by Magic?
- Injection by Type
- Injection by Name
- The Component Environment
- Deployment Descriptors
- Impact on Stateful Session Beans
- JNDI
- Connecting to a Remote Bean
- Using mappedName
- Who Can Declare Dependencies
Chapter 8. Message-Driven Beans (Optional)
- Asynchronous Messaging
- The Java Message Service
- Message-Driven Beans
- Message Types
- Injecting JMS Queues
Appendix A. Learning Resources
Appendix B. Quick Reference: Java EE Annotations
Hardware/Software Requirements
Hardware – minimal
1 GHz, 512 meg RAM, 1 gig disk space
Hardware – recommended
2 GHz, 1 gig RAM, 1 gig disk space
Operating system
Tested on Windows XP Professional. Course software should be viable on all systems which support the Java EE 5.0 SDK.
Software
All free downloadable tools.
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