Answer Posted / amar

The major differences i have seen between EJB 2.x and EJB
3.0 versions are as follows :-

1). Removal of home interface enabled simple lookup process
in ejb 3.0

2). EJB deployment descriptors are not required in ejb3.0

3). Annotations are used in ejb3.0

4). EJB 3.0 entity beans don’t have home and remote interfaces.

5). EJB 3.0 entity beans/JPA becomes local. Remote
annotations are not at all supported for entity beans.

6). EJB 3.0 beans don’t implement the standard interfaces
like javax.ejb.SessionBean and hence no need to implement
the container call back methods like ejbActivate() etc

7). Query is very flexible. Multiple levels of joins are
enabled through the refined EJB-QL

8). Can be used with pluggable third party persistence providers

9). Security can be provided either through annotations or
through deployment descriptors

10). POJO like EJB 3.0 entities become lightweight and easy
to convert from a DAO to Entity bean or vice versa. Since
EJB 3 entities don’t need implement any interface.

Differentiate “find a method” from “select method” in EJB ?

1048

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What is the advantage of using entity bean for database operations, over directly using jdbc api to do database operations?

1060

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What are the types of enterprise bean?

1042

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What do you mean by in-memory replication?

1110

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What is ejb container?

1201

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What is the procedure of ejb container to handle exceptions?

1022

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what is mean by OLE ? Please answer me. Advance thanks.

2801

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What is entity bean in ejb?

1180

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How many ejb objects are created for a bean?

1028

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What is the difference between Session bean and Entity bean?one?

1189

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What is the procedure for the creation of stateless ejb?

1030

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Define Clone?

1136

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Define ripple effect?

1128

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What is the difference between @requestparam and @pathvariable?

1034

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What are the differences between ejb 3.0 and ejb 2.0?

1095

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