Enterprise JavaBeans Architecture

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Enterprise JavaBeansArchitecture

• Vlada Matena
• Sun Microsystems Inc.

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Enterprise JavaBeans Architecture Goals

• Simplify and standardize development and
  deployment of enterprise applications
• Achieve broad industry acceptance
• Embrace and extend vendors existing platforms
• Enable development of portable components
• Allow multi-vendor interoperability

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Enterprise bean component
enterprise bean class
Container
home and remote interfaces
Services (transaction, security, etc.)
AccountHome
AccountBean
DBMS
Client
Business logic
Account
Data access
Deployment descriptor
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Division of responsibilities

• Container provides
• Distribution protocol
• Instance life cycle
• Process and thread mgt.
• Concurrency (multi-user)
• Transaction management
• Security management
• State management
• Data access logic for CMP
• Support for administration
• Support for high-availability
• Support for clustering
• Non-Java systems integration

• Enterprise bean contains
• Business logic
• Data access logic

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Enterprise JavaBeans advantages

• Higher-level business component model
• Performance scalability
• Clean transaction demarcation API
• Transaction synchronization
• Robust Java business components
• Portability of binary business components
• Enterprise application integration
• Available today on proven TP platforms