About Question enthuware.oce-ejbd.v6.2.462 :

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jszczepankiewicz

About Question enthuware.oce-ejbd.v6.2.462 :

Post by jszczepankiewicz »

In the answer (explanation) is "(...)has been designated as a Removemethod(...)",
should be:
"(...)has been designated as a Remove method(...)".

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Re: About Question enthuware.oce-ejbd.v6.2.462 :

Post by admin »

This has been fixed.
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max2fl
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Re: About Question enthuware.oce-ejbd.v6.2.462 :

Post by max2fl »

Hi,

from explanations:
An ejb acquires resources in PostCreate (and PostActivate) callback methods and it releases the same resources in PreDestroy (and PrePassivate) methods.
should be:
An ejb acquires resources in PostConstruct (and PostActivate) callback methods and it releases the same resources in PreDestroy (and PrePassivate) methods.

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Re: About Question enthuware.oce-ejbd.v6.2.462 :

Post by prakashyaji »

Hi Paul,

I need one doubt here... Please help me...
"Remember:
An ejb acquires resources in PostConstruct (and PostActivate) callback methods and it releases the same resources in PreDestroy (and PrePassivate) methods.
If a bean is passivated and if the timeout occurs, the container does not call the PreDestroy method."

Here, I remember reading somewhere that, if SystemException occurs then also PreDestroy method is not invoked. In such scenarios we have to do cleanup in lifecycle event callback interceptors. Am I correct? Please clarify.

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Re: About Question enthuware.oce-ejbd.v6.2.462 :

Post by admin »

prakashyaji wrote:Hi Paul,

I need one doubt here... Please help me...
"Remember:
An ejb acquires resources in PostConstruct (and PostActivate) callback methods and it releases the same resources in PreDestroy (and PrePassivate) methods.
If a bean is passivated and if the timeout occurs, the container does not call the PreDestroy method."

Here, I remember reading somewhere that, if SystemException occurs then also PreDestroy method is not invoked. In such scenarios we have to do cleanup in lifecycle event callback interceptors. Am I correct? Please clarify.
PreDestroy is a life cycle call back listener method and it is not called in case of system exception.
As per Section 4.6.3 of EJB 3.1 specification:
The application using the session bean should provide some clean up mechanism to periodically clean up the unreleased resources.
For example, if a shopping cart component is implemented as a session bean, and the session bean stores the shopping cart content in a database, the application should provide a program that runs periodically and removes “abandoned” shopping carts from the database.
HTH,
Paul.
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henrid
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Re: About Question enthuware.oce-ejbd.v6.2.462 :

Post by henrid »

I once read in a book that every stateful session bean should have at least one method with @Remove. But I cannot find it in the spec, so can anyone confirm that my statement is true or false?

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Re: About Question enthuware.oce-ejbd.v6.2.462 :

Post by admin »

As per section 4.3.11:
A stateful session bean written to the EJB 3.x API typically has one or more remove methods designated by means of the Remove annotation or remove-method deployment descriptor element.
So, it is not mandatory but used commonly so that the bean can do any cleanup while being removed.
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Re: About Question enthuware.oce-ejbd.v6.2.462 :

Post by henrid »

Good to know, thanks!

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