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JPilot Mock Exam Question - Help Needed!

 
Seenu Reddy
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Which statements about stateful and stateless session beans are true?

A. Only stateful session beans support transactions.
B. Only stateful session beans can be passivated.
C. Only stateful session beans have a 'setSessionContext' method.
D. Both stateful and stateless session beans can support overloaded 'ejbCreate' methods.
E. Both stateful and stateless session beans can implement the 'javax.ejb.SessionSynchronization' interface.
F.Both stateful and stateless session beans can have instance variable state.

Select 2 answers

I can think only B is correct. But in the exam says B and F both are correct. How stateless session beans can have instance variable state.

Could some one can explain me about the same?

Thanks,
Seenu
 
Pranav Shukla
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Hi Seenu,

Stateless session beans can have state in their instance variables but they cannot contain state specific to a particular client.

Refer to EJB 2.0 Specification section 7.8 page #87 which says,


The term �stateless� signifies that an instance has no state for a specific client. However, the instance
variables of the instance can contain the state across client-invoked method calls. Examples of such
states include an open database connection and an object reference to an EJB object.
 
Seenu Reddy
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Pranav Shukla,

Thanks for your response. I got the point and i miss interpreted the point.

Thanks,
Seenu
 
It is sorta covered in the JavaRanch Style Guide.
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