Sorin Ciolofan

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Recent posts by Sorin Ciolofan

Faiz A Chachiya wrote:
I have two application which point to same database but run under different JVM.

1. Admin application - The admin application is responsible for adding some entites, reporting....., runs under Tomcat6.
2. Service application - The service application does some processing, running outside Tomcat6.

There is table called as DTR, when a new DTR is added through the Service application and when someone does the reporting through the Admin application, the newly added DTR does not showup. I think it only shows up the data that had been cached earlier by admin application.


Is there anyone who has faced similar problem in past or anyone who has any solution


Regards,
Faiz.



Hello all!

We have a similar problem but we are using OpenJPA and not Hibernate.
We do a search by ID using an EntityManager object. The application worked fine when it was deployed on a single JVM server, but when it was deployed to another server that has 3 JVM's the data we retrieve by doing a search by ID is not the latest data available in the DB (so if the user changes that data via the UI and the data is stored in the DB what we retrieve when we want to fetch the data by ID is not what the user has just set but the older version).
We did not set any type of caching in the persistence.xml file. Do you have any idea what could be wrong here?

Thank you
Best regards,
Sorin

Krishna Jonnalagadda wrote:Congrat !!


Thanks
11 years ago

Sharma Ashutosh wrote:Congrats!!!



Thanks
11 years ago

Yegor Bugayenko wrote:Congratulations!



Thank you very much!

Best regards,
Sorin
11 years ago

Hello all!

Today I just received the email from Oracle that I've passed the Architect certifications. It was a great experience for me and I'd like to share with you some thoughts.

- I'm also a SCJP and SCWCD. All the study was Self-Study for all the Sun certifications. So the path that I would recommend to any person to get to SCEA is the natural one: programmer -> developer -> architect. Get certififed first as SCJP. Then get certified as a developer (SCWCD,SCBCD, etc). Then learn for SCEA.That would help you to understand things better. Just being a person without a few years of Java real programming experience and trying to certify as an Architect won't help.

- The Sun exams in general are a great experience - you learn something very useful, you structure your information when you learn; you have a global view - and for all the effort you are rewarded at the end! The exams never ask you to memorize things.

- For the specific Architect exam:

- part1 is the most difficult one. The questions are difficult and time is very limited.
- part2 was the most enjoyable for me. It was a real pleasure to work on the design for the assignment. The problem is not difficult, the types of diagrams you are asked to provide are basic diagrams (classes, component, deployment, sequence). There is nothing sophisticated required to model. Just keep it simple and clean. Document all logical assumptions you made when deciding associations between classes (1..n; n..n, etc). I did not chose any framework such as Struts/Hibernate/Spring; just standard J2EE components (JSP's, EJB's) and it was OK.
- part3 - do not underestimate it. Focus on the questions, try to write as much as possible (do not write 1 sentence per question!) and always think at your problem solution when answering. Justify your design in your answers.

The books I've used to certify are:
- Sun Certified Enterprise Architect for Java EE Study Guide (Exam 310-051) (Certification Press) [Paperback]
Paul Allen (Author), Joseph Bambara (Author) http://www.amazon.com/Certified-Enterprise-Architect-310-051-Certification/dp/0071488618/ref=pd_bxgy_b_img_c
- Sun Certified Enterprise Architect for Java EE Study Guide (2nd Edition) [Paperback]
Mark Cade(Author), Humphrey Sheil (Author) http://www.amazon.com/Certified-Enterprise-Architect-Study-Guide/dp/0131482033/ref=pd_bxgy_b_img_b
- Read EJB 3.0 specifications from Sun
- Read J2EE 5 tutorial from Sun/Oracle (especially the Web Services part III) http://download.oracle.com/javaee/5/tutorial/doc/gexaf.html

All the best and good luck!

Sorin


11 years ago

Hello!

I'd like to ask if one should include in the Class diagram also the jsp's needed for the admin component such as user/roles/permissions admin, admin for different things that needs to be created, edited etc. Also the question is about the need for an AdminManager. For example, to refer to Cade's example described in the book for JustBuildIt company, there will be needed pages where the admin can create new materials apart of Wood, Steel, Concrete and also should be able to add new characteristics for these materials, etc.
I noticed that in Cade's book these are not included.
To include all these will make the diagram heavier and less easy to follow.
What is your opinion?

Thank you
Sorin

durgesh tiwari wrote:Hello Friends,

Today , I gave my Part 3 exam , I gave all the best possible answers for 8 questions , based on my designed architecture (Which I yet to submit). I got confuse over the Mark-sheet of Part 3 , which I got just after giving part 3 , it says Test Status "Failed" .

How come mark-sheet can show status as "Failed" where still I need to submit my Part2 .

Friends , Please let me know , is it expected case ??? or did I do anything wrong while finishing part 3 exam.


I am extremely nervous on this.

Please reply.



Thanks & Regards
Durgesh Tiwari



Hi!

I'm just wondering, if one submits part2 before taking part3, after part3 is done at the test center, the same 0 score will be printed?

Thanks
Sorin

Ajay Singh Rathore wrote:Hip Hip Hurray,

Received mail from Oracle today that i have passed Oracle Certified Master, Java EE 5 Enterprise Architect certification. Now i am among the elite 1%(as per Oracle) of certified Java Enterprise Architect. Thanks all here for your help and guidance.
Mail doesnt show the scores though.

Ajay
SCJP, SCDJWS, SCEA/OCMJEA



Congratulations!
What is that 1% meaning? Is 1% from what?

Thanks
Sorin
11 years ago
Hello!

I'd like to refer to Cade's book for preparation of the SCEA exam and also to the tackling of Part 2.
In the mentioned book there is an example for the JustBuildIt company. For the text that is given for the assignment one can infer that a web service application needs to be done. There is nothing in the requirements of the problem about the fact that a web application with presentation layer in the form of jsp's would be required.
My impression is that the proposed solution though is about how to build a web application in the MVC paradigm rather than how to solve the problem of the web services. Did anyone else have the same impression?
I'm wondering why it was proposed a solution with JSP's, Controllers, etc when the text of the problem does not require that? The solution presents jsp's on how to search for bids, orders etc, while from the text of the problem we can infer that the clients of the application will use web services and not jsp's.

Any comments on this will be highly appreciated, since my impression is that the same kind of confusion could exist in REAL Part2 assignments.

Thank you
With best regards,
Sorin

Jakub Adelka wrote:I have skimmed the considerably part of the forum, and I really did not find out, an answer to this question, what class diagrams should be made of?
In the various UML articles, I did not find, that .jsp files, are part of it, but in Cade's book, it is. Since they will, after all, grade my worked solution, should I follow the patter of the diagrams they use their book?
Thanks



Hi!

I think in Cade's book is not so complete and accurate.
Personally I'm not a supporter of including the jsp's in the class diagram. First of all they are part of the presentation layer and not of the model that has to be designed in the class diagram.
Secondly, when those jsp's were included, no attribute or method was mentioned, but just a class name - this does not make too much sense either I suppose...

Also in the Cade's book I saw in the class diagram some helper classes such as "Money" which are not defined anymore, but they are used when the attributes of other classes are defined.
I'm wondering if a complete class diagram should not include these helper classes as well?
For example saying that Money contains a currency and an amount field, etc, etc...

Yegor Bugayenko wrote:One of NFRs in my SCEA-2 assignment says that the SuD shall process all transactions in less than 5 seconds.

What are the possible objective (!) mechanisms that can guarantee/ensure such an NFR? I'm a bit stuck. Thanks in advance!



I do not think that there is any specific way in the UML diagrams to achieve this NFR. They put it there maybe for the risk/mitigation section.
Some patterns should be applied as caching, as mentioned earlier, but I'd have in mind also vertical scaling and DB tuning. If you have a DB2 system running on a less powerful old dusty PC with 1GB of RAM and not tuned accordingly, also having not normalized tables, the transactions could complete in minutes and not in less than 5 seconds! :-)

With best regards,
Sorin

Anil Chowdary wrote: Your part 2 exam evaluation will being only after you take the part 3 exam. So its advicable to take part 3 and submit part 2 assignment.
Regards,
Anil Chowdary K



Hi Anil!

Thank you for your reply. I have to admit that I'm a little bit confused since I've read on the Oracle Certifications web page that

The essay consists of 8 questions in reference to your assignment submission.

So this is ambiguous, but does that mean that the 8 questions are strictly related to the content of part2, in other words, they are meant to verify that you are the author of the solution and not someone else?

If this would not be the rational of part3, I'm wondering then why Oracle did not include the essay in the part2 assignment and let only 2 parts?

Hello!

I've passed in the mid December 2010 part1. Because of a problem I've with my credit card I need to postpone the purchasing of part2.
I'd like to ask if there is any time window / deadline I should purchase part2 or I can purchase part2 at any moment (since part1 remains valid) ?

Thank you
With best regards
Sorin

Henry Naftulin wrote:It looks like the thread for Horizontal scaling got side conversation on what is Reliability is, so I figured this topic deserves its own thread.

So is reliability = correctness + availability or is it something else?

Any thoughts,

Heading to part 3 exam tomorrow, so it would be great to hear your thoughts and any tips on part 3

Henry



This formula is great!
Reliability is the ability of a system to provide correclty its functions in a specified time.

Rahul Mishra wrote:
About a week ago, i got the much anticipated mail from Oracle informing me that i have been certified

Didnt find time to post my experience earlier... But here it is now :

My SCEA/OCMJEA Experience

Part 2 and 3
Part 1

HTH



Hello Rahul!

First of all Congratulations!
I'd have one question: Did you receive your score for Part2 before taking Part3? Or you receive a total score for part2 and part 3 considered together?

Thank you
With best regards
Sorin