This week's book giveaway is in the Programmer Certification forum.
We're giving away four copies of OCP Oracle Certified Professional Java SE 11 Programmer I Study Guide: Exam 1Z0-815 and have Jeanne Boyarsky & Scott Selikoff on-line!
See this thread for details.
Win a copy of OCP Oracle Certified Professional Java SE 11 Programmer I Study Guide: Exam 1Z0-815 this week in the Programmer Certification forum!

puja k

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since May 07, 2001
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Recent posts by puja k

I am currently stydying EJB.I had read that at any point in time I can have multiple instances of an Entity Bean pointing to the same Database record in the underlying datastore (i.e same primary Key).This is done by the container when there are many clients requesting for the same data simultaneously.
In the Weblogic Documents , I came across the following:-
"The EJB 1.1 container in WebLogic Server Version 5.1 uses a pessimistic locking mechanism for entity EJB instances. As clients enlist an EJB or EJB method in a transaction, WebLogic Server places an exclusive lock on the EJB instance or method for the duration of the transaction. Other clients requesting the same EJB or method block until the current transaction completes.
This method of locking provides reliable access to EJB data, and avoids unnecessary calls to ejbLoad() to refresh the EJB instance's persistent fields. However, in certain circumstances pessimistic locking may not provide the best model for concurrent access to the EJB's data. Once a client has locked an EJB instance, other clients are blocked from the EJB's data even if they intend only to read the persistent fields. ".
If that is the case, as mentioned above , then does that mean that the Weblogic container would have at any point in time only one instance of an Entity Bean pointing to a specific database record??
Thanks,
Pooja

Hi all,
I am an SCJP and I wanted to know whether this new examintaion requires one to be an SCJD as well.Also when approximately will the exam be open to everyone. Since SUN is still conducting the beta test , I guess it would take some time for them to actually make this available to everybody.I am planning to get my SCJD certification but after having read this post I was thinking if I could wait and just give this one exam. Please advice.
Thanks,
Pooja