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How beans in EJB3.0 are threadsafe?

 
pradeep singh
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posted 16 years ago
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Hi
How beans in EJB3.0 are threadsafe?

SCJP 5.0(75%), SCWCD 5.0(88%)

 
Joe San
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posted 16 years ago
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Can you say how your servlets are thread safe?

SCJP 1.4, SCWCD 1.4 - Hints for you, Certified Scrum Master
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pradeep singh
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posted 16 years ago
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Servlets are thread safe because web-container creates only one instance of each servlets but when a client requests then container creates a thread to access this servlet instance.

SCJP 5.0(75%), SCWCD 5.0(88%)

 
Ulf Dittmer
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posted 16 years ago
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Servlets are thread safe because web-container creates only one instance of each servlets but when a client requests then container creates a thread to access this servlet instance.


In other words, servlets are not thread-safe, unless the developer takes care to make them so.
 
E Lievaart
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posted 16 years ago
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The EJB container ensures that there is always only 1 Thread accessing an EJB.
Different threads may be directed to an EJB, but not simultaneously.
This is why you are not allowed to create threads or use synchronization.
It is the turf of the container.
Basically EJB's are similar to the Servlet single thread model.

Of course this doesn't relieve the programmer of any concurrent considerations.
For example:
Don't use instance variables (except resources) in stateless session beans.
 
pradeep singh
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posted 16 years ago
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Hi
Thankx
It was my misunderstanding .I know servlets by default are not threadsafe but developer can make it if require.

SCJP 5.0(75%), SCWCD 5.0(88%)

 
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