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Allow application developer to concentrate on business logic, instead of systems details of distributed systems, transaction logic, database access, security, scalability and integration with existing systems.
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Cross-platform capability - using Java means "write once run anywhere".
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Logical extension of JavaBeans component programming.
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Existing non-Java enterprise applications can be used as components.
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Certain behaviors such as security and transactions should be set as properties of the component, instead of hand-programmed.
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