EJB Interview Questions and Answers
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Ques 46. What is a Clone?
The copies of a server group are called Clones. But unlike a Server Group Clones are associated with a node and are real server process running in that node.
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Ques 47. What are the types of Scaling?
There are two types of scaling: Vertical Scaling and Horizontal Scaling.
Vertical Scaling - When multiple server clones of an application server are defined on the same physical m/c, it is called Vertical Scaling. The objective is to use the processing power of that m/c more efficiently.
Horizontal Scaling - When Clones of an application server are defined on multiple physical m/c, it is called Horizontal Scaling. The objective is to use more than one less powerful m/c more efficiently.
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Ques 48. What is a Server Group?
A server group is a template of an Application Server(and its contents) i.e, it is a logical representation of the application server. It has the same structure and attributes as the real Application Server, but it is not associated with any node, and does not correspond to any real server process running on any node.
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Ques 49. What’s new in the EJB 2.0 specification?
Following are some of the main features supported in EJB 2.0:
1. Integration of EJB with JMS,
2. Message Driven Beans,
3. Implement additional Business methods in Home interface which are not specific for bean instance, EJB QL.
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Ques 50. How can I access EJB from ASP?
We can use the Java 2 Platform, Enterprise Edition Client Access Services (J2EETM CAS) COM Bridge 1.0, currently downloadable from Sun.
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