Ganesh Krishnan

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Recent posts by Ganesh Krishnan

Hi Jack / Pradip,

It doesnt matter whether the client exists in same jvm or not, if u access a ejb remote component interface, its still a remote call.

As Peer rightly said, the local client is one which uses local home and component interfaces of an enterprise bean.

- Ganesh.
SCJP,SBCD,SCEA,BEA Certified Weblogic Administrator.
Hi Shalu,

EJB being part of J2EE spec, does support inheritance... by saying that when u inherit the one bean CLASS in another, you can inherit the functionality, but not the 'UNDERLYING BEANESS' provided by it...

- Ganesh.
SCJP,SBCD,SCEA,BEA Certified Weblogic Administrator.
Congrats Charu
14 years ago
Hi AC,

Please remember that for each stateful session object, the container assigns a unique identity, since they are specific to each client.

Thus in the case of statful SB, the isidentical() method will always evaluate to false for diff. ejb objects, though both of them are from the same home...

hope this clarifies your question.

- Ganesh.
SCJP,SCBCD,SCEA,BEA Certified Weblogic Administrator.
Hi Tom,

As Peer said, it doesn't matter where the client and the EJBObject are running on the same jvm, the call will be still REMOTE.

For ejb's using remote component interface, if you want to still make use of call-by-ref., then you may need to tune the application server to optimize the call to pass as ref rather than by-value.. if everything resides on same jvm.

This may lead to problems like portability and also you need to make sure that the state of the objects being paased by reference are maintained preoperly...

- Ganesh.
SCJP,SCBCD,SCEA,BEA Certified Weblogic Administrator.
B is correct because A being local client cannot get its reference passed to a remote client....


- Ganesh.
SCJP,SCBCD,SCEA,BEA Certified Weblogic Administrator.
Hi AC,

To put things simply, the Stateless session bean is not client specific, and the EJBObjects generated by the same home would evaluate to true... thus for all stateless session beans the isIdentical() method will return true...

- Ganesh.
SCJP,SCBCD,SCEA,BEA Certified Weblogic Administrator.
Hi San,

The topics which i found difficult were CMP/CMR Component Contract. Also, in EJBQL there were different scenarios given and asked to write queries based on them..

Frankly with a sql background, it found some of the questions in EJB QL a bit wierd, because the exam expects the queries to be formed in a specific format... I think SUN should accept any possible answer to the queries, as long as it is correct... which could be btw simpler than what they expect...
just a thought...

Ganesh.
Oracle India Pvt Ltd.
SCJP,SBCD,SCEA,BEA Certified Weblogic Administrator.
14 years ago
Hi All,

I have cleared the SCBD exam with a score of 90%.

It took a week to prepare for this exam and I followed the books HF EJB, SBCD Exam Kit from Paul and the EJB Spec....

The exam was comparitively simpler than i thought and gives you ample time to think ....

I would like to thank all of you for providing so much resources and information regarding this exam.

All the very best.

Ganesh.
Oracle India Pvt Ltd.
SCJP,SBCD,SCEA,BEA Certified Weblogic Administrator.
14 years ago
Hello Saravanan....

Congrats on your acheivement.

Since being a novice, I would advice you to first learn the web-tier technologies like JSP,Servlets and then give a shot at the business-tier technologies(EJBs)...

Regarding the certifications you can take both SCWCD as well as SCBCD, since both has good market value and boost your career.

Regards
- Ganesh
Rashmi,
Pls find my answers below :

Ganesh thanks and no problem I dont expect you to give me full soln wrt it, and I got your reply anyway.
=>

And would you please give some basic info related to SSL requiremnt of Proj, any links or book ref would be appreciated.
does it come in digs , or will have to be put conceptually.

=> I would say, it is just enough to specify in the document and the diagram that, the mode of communication is via SSL.

Ciya,
- Ganesh.
Shogo,

congratulations !!! . Its party time

- Ganesh
Rashmi,

Yes, equipment can be thought as read - only entity, but i didnt takeout any classes that are already part of the original BDM. If you are removing any, you may have to justify it in the assumption document.

I can't really divulge how I had handled the signon case, but you may want to check the servlet filters pattern.

Hope this help, or else please let me know.

- Ganesh
Prasad,

Yep, I did.

- Ganesh.
Rashmi,

Thanks for your wishes.

1) did u consider 'Equipment' on BDM, I dont understand how to relate it with the system.

Equipment can be attributed to the 'physical aircraft' which would be attached to the flight.

2)Did u handle seat booking, as there isnt any specific use case for that?
Yes I did. It comes as part of the specified use cases which involves reservations.

3)did u justify in ur notes why u were going for the Distributed or n tier architecutre than just 2 tier.?

Hmm... Not really , because the main requirement of the assignment is the solution should be j2ee. But i did gave a section in the document stating how j2ee address the func/non-functional requirements.

4)n last one ...When it comes to authentication, can u provide some pros and cons of handling it at webserver or appserver level.So that I can choose which one fits best. Or any links please.

Sorry, I am not clearly understanding the point(web/app server level) here.. Can u elaborate it more


Thanks,
Ganesh.