INTERVIEW QUESTIONS J2EE SPRINGS DETAILS

Question: What are the differences between EJB and Spring ?

Answer: Spring and EJB feature comparison.
Feature EJB Spring
Transaction management

* Must use a JTA transaction manager.
* Supports transactions that span remote method calls.



* Supports multiple transaction environments through its PlatformTransactionManager interface, including JTA, Hibernate, JDO, and JDBC.
* Does not natively support distributed transactions—it must be used with a JTA transaction manager.

Declarative transaction support

* Can define transactions declaratively through the deployment descriptor.
* Can define transaction behavior per method or per class by using the wildcard character *.
* Cannot declaratively define rollback behavior—this must be done programmatically.



* Can define transactions declaratively through the Spring configuration file or through class metadata.
* Can define which methods to apply transaction behavior explicitly or by using regular expressions.
* Can declaratively define rollback behavior per method and per exception type.

Persistence Supports programmatic bean-managed persistence and declarative container managed persistence. Provides a framework for integrating with several persistence technologies, including JDBC, Hibernate, JDO, and iBATIS.
Declarative security

* Supports declarative security through users and roles. The management and implementation of users and roles is container specific.
* Declarative security is configured in the deployment descriptor.



* No security implementation out-of-the box.
* Acegi, an open source security framework built on top of Spring, provides declarative security through the Spring configuration file or class metadata.

Distributed computing Provides container-managed remote method calls. Provides proxying for remote calls via RMI, JAX-RPC, and web services.

Spring and EJB feature comparison.
Feature EJB Spring
Transaction management

* Must use a JTA transaction manager.
* Supports transactions that span remote method calls.



* Supports multiple transaction environments through its PlatformTransactionManager interface, including JTA, Hibernate, JDO, and JDBC.
* Does not natively support distributed transactions—it must be used with a JTA transaction manager.

Declarative transaction support

* Can define transactions declaratively through the deployment descriptor.
* Can define transaction behavior per method or per class by using the wildcard character *.
* Cannot declaratively define rollback behavior—this must be done programmatically.



* Can define transactions declaratively through the Spring configuration file or through class metadata.
* Can define which methods to apply transaction behavior explicitly or by using regular expressions.
* Can declaratively define rollback behavior per method and per exception type.

Persistence Supports programmatic bean-managed persistence and declarative container managed persistence. Provides a framework for integrating with several persistence technologies, including JDBC, Hibernate, JDO, and iBATIS.
Declarative security

* Supports declarative security through users and roles. The management and implementation of users and roles is container specific.
* Declarative security is configured in the deployment descriptor.



* No security implementation out-of-the box.
* Acegi, an open source security framework built on top of Spring, provides declarative security through the Spring configuration file or class metadata.

Distributed computing Provides container-managed remote method calls. Provides proxying for remote calls via RMI, JAX-RPC, and web services. Source: CoolInterview.com

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