Java/J2EE Project Name proposal.

Choices of names proposed:

1. William Wallace
2. Great Alexander
3. Gladiator
4. Big Boss
5. Ashoka (Why not Indian Names?)
6. Sivaji

I like to choose any one from the list. I would be happy if you could pick up one name and vote it!
Or I can go about choosing one name to separate dev/build release cycles.

So, for whom this name?

I have planned to evaluate Light Weight J2EE Architecture. I am planning to re-engineer SAB with LW J2EE. Or, I am planning to build a biggest sample application that will cover all application life cycle scenarios. I have sent a re-engineering architecture proposal to some of my friends. They wanted me to think about a new one to start from scratch.

I might work on coming up with a new application architecture that will cover

• Complex persistence scenarios
• Complex Integration Scenarios
• Commonly used architectural patterns
• Light Weight J2EE Components trade off over Heave weight Components to satisfy Non-functional requirements.
• A complete product development life cycle (including development guide, source control, various testing process, build maintenance, releases, patch releases, bug tracking, etc)
• Comparing and contrasting different stacks of J2EE/Generic Enterprise application.

Let me work on it for some times.

Java: Collest bug, ever seen!

Recently, I was a fixing a bug (which was introduced by me!). The bug is very silly, you may never catch it!

Issue is, a there is a java bean factory class with factory methods. In one of the factory method, a recursive call was there (which was not supposed to be), it was causing a stack overflow exception.

The factory method is supposed to be like this,

(I am providing a sample code, not actual code)

public Employee newEmployeeImpl()
{
return (Employee)new EmployeeImpl();
}

Instead of this, the code was mistakenly written as,

public Employee newEmployeeImpl()
{
return (Employee)newEmployeeImpl(); //there is no space in between new and EmployeeImpl!
}

It was accidentally typed without leaving a space between new and EmployeeImpl class. It is syntactically correct. So, the compiler didnt crip for the expression. But, at runtime, it goes as a recursive call!

So, the newEmployeeImpl() factory is getting called at infinite number of times and results in Stack Overflow Exception...

I laughed out to myself when I found this issue!

I am a J2EE Architect! – Says Sun Microsystems.

Now, it is mid-night 12:33 AM. A windy night and rain is pouring heavily outside. Weather is so cool, and my heart is too. Though I am feeling like running outside and shout louder in the rain…, I can not do that now. Because, I am 24, and yet, the time is mid night 12.

The much awaited result is out..! I have been waiting for this result, since last 3 to 4 weeks. My Architect exam result. Why I am so excited about this is, I am only 23.7 years old – too young to have Architect Certified! :-)

Out of all my learnings till date, I consider this exam is pretty worth. The perspective of looking at software systems has changed, after looking them through the architect view. I don’t see software as a program or piece of code; I see software is assembled of components and constructs. They are like bricks and stones that give the infrastructure (I am more or less has become as a mechanic!)

I will cherish this great moment till life long. Let me recall, what I have done, lost, tried and given up to get this Architect Exam.

The Exam has 3 parts. In Part-I, we need to answer for multiple-choice questions. In Part-II, we need to workout a J2EE based architectural solution, for the problem given by Sun Microsystems. In Part-III, questions will be asked from our Part-II solution. Part-III is an essay type exam. We need to answer their questions in paragraphs.

Sun Certified Enterprise Architect – Part I

Date : 25^th Sept 2007

I have already published a post about this Part I exam, here: http://manivannan57.blogspot.com/2007_09_01_archive.html

Sun Certified Enterprise Architect – Part II (Assignment)

Date: 28t^h Feb 2008

Here is the stage, you host your skills! I registered for the part II – Assignment exam. I received the assignment, and started reading the requirements about a week. I understood what the requirements were, but did not find even a single clue about how to derive solution

I started reading advises from saloon forum http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=forum&f=26 at my free times. Needless to say, more we listen to people’s advice, the more we get confused. So, I gave up reading the forum, as it had ‘N’ number of views, arguments, advises, approaches and etc. (But, one should really read through the forum, just to see how different people mind can think to derive a solution for a given single problem! :-) )

I was helpless to bring solution and to verify my solution is correct. Because, I have not met any real world architects so far. Also, I had a fear that, they can misguide me to give a Design Solution instead of the required Architectural solution. Because, most of the techies do not distinguish a ‘Design’ and an ‘Architecture’. (And there are cases, where people have failed in the exam, as they submitted a design kind of solution rather than the architectural solution).

I’ve decided to keep my architectural solution very simple and straight-forward. I have strongly decided not to use any Framework (that is not a part of J2EE) in my solution. I did so.

The difficult part in my assignment, which I feel is, session handling decision. I needed to give a session handling solution for JSP and Swing based clients. First, I have decided an approach. I went out for coffee and cam back, and then changed the approach. I went out, looked at the children playing in the street, cam back then, and changed the approach. Likewise, it got changed many times, that I cannot even remember.

I was very strong in one thing – the examiner should be able to understand my architectural solution without any difficulties. Keeping that in mind, I put lot of details in supporting documents. I explained the approach over several pages; also, clarified the reason why I opted that approach over others.

Also, I have presented a Traceability Matrix for Functional and Non Functional requirements. That might be impressive. But, that is dangerous too. If I forget to add any requirement in the Matrix, then he will catch me. I spent lot of time to make sure that all the requirements are addressed in the Matrix table.

That’s all.

One early morning I submitted the assignment to Sun.

Sun Certified Enterprise Architect – Part III (Theory Exam)

This exam was an interesting one. We need to write the answers as paragraphs. No! we cant fill the paragraphs with some legacy stories; the answer we provide here will have to match with the architectural solution submitted for Part-II. So, I reloaded all the assignment requirements and my solution into my memory, before taking up this exam.

All of the questions were about Non Functional requirements. That’s, about performance scalability and the kind of stuffs. I gave only valid points to fill up the paragraph. I repeated most of the lines from my Part-II supporting documents. Because, it should match right.

Finally

Part II & Part III Score: 88% (Pass)

Part I Score: 95% (Pass)

Overall Grade: Pass

That’s it!

I am so excited to get passed in this exam. I am happy that I have passed in the top most level of J2EE exam, in this young age. Many people advised me that one should have minimum 6 to 8 years of experience in designing and architecting software applications to give such exams. But, me poor guy has only 2 and half years. But, I have endless passions to do.

This is the last level of the exam. So, I have decided to not to take any more certification exams in the future.

Maximus - The Gladiator. (NOT A MOVIE REVIEW)

Maximus:

I have chosen this name (Maximus) for the next release of my pet project.. , to be more frank, mini product. Yes, it has grown as a product, with all such composite eligibilities. Personally, I would like to call it as a platform, not a project or product. Because, it is ‘programmable’ rather than ‘usable’.

People usually consider birds, trees, and pet animals for naming their company/product/children. I like choosing brave names. A fighter or War hero or brave man ever lived. I chose ‘Archer’ as the name for the first release. Now, I am half the way to release next version. I was looking for a name, and hardly satisfied. I chose ‘Ajax’, which is a brave king name, but dropped the idea later, as it may conflict with the existing ‘Ajax’ language.

And, I am satisfied with ‘Maximus’ – Gladiator hero. Gladiator means, a continuous fighter; a fighter who fights for survival. It makes lots of sense to me personally. So, I chose this name ‘Maximus’.

This second drop may happen before Jan-2008. Currently, I am trying to complete business logic coding. Once it is done, I will refactor the whole code against various standards.

Then, I’ll expose the whole project platform as a service, so that it can constitute to SOA.

I am not sure how much time I can spend on this project daily. I have millions of other works going ahead in parallel. I will be the single and only developer in this Maximus release. I don’t find people joining in and I am not going to ask anybody to join, anymore :-)

I have spent so much of time on this SAB (Stock Analysis Base). It has helped me than the level of my expectation. I don’t know anything about stocks or investment earlier. I am techie; hardcore techie; if I had been into investment earlier, then this might be a killer combination. :-)

I enjoy architecting SAB! My first architecture assignment! :-)

-- Manivannan.P(@) gmail.com, SAB Architecture.

6 years after....

Few weeks back I went to my college, where I was 'educated'. There was going a faculty training program, sponsored by ISTE. They were looking for a guy to give a presentation on Networking & Webservices in J2ME and also to talk about J2EE in general. I agreed to speak, only because the audience would not be students; because I know, what the student’s mentality would be. The audience was mainly lecturers, few professors, and some M.E students from various colleges.

I reached Erode at morning 5.30. By 6'o clock, there was car to pick me up. I was dropped in Guest House, served breakfast and told that there would be a pick up to the venue at morning 8.30. A car dropped me in front of IT-Park! Some unknown fear and unknown silence started waving in heart. Because, that was the feeling I always had, when I was there 2 years back. History repeats itself!

I met few of my lecturers and professors whom I knew or who remembered me. Lots of people left the campus; hence most of the faces were quite new to me.

The venue was ITP - Seminar Hall 2. After briefing my self introduction, I just started the session….

“Java is yet another cancer (after Linux), it starts spreading everywhere today; Java runs in computer, laptop, big fat servers, my mobile, Tv, Smart Cards, Mars Rovar...and etc”

I gradually landed in J2ME. And discussed the architecture of J2ME and explained how stuffs are programmed in J2ME, with lots of sample snippets. After discussing various networking connections in J2ME, we went into SOA, and Web Services.

I don’t like to listen continuously and also don’t like to speak continuously in front of others; so I broke the session in every 20 minutes. I think it went around 3 hours. Later, we had a Q&A session on J2EE. Really, very curious people they are, they asked lots of interesting questions. I encountered lots of questions on EJB3.0, WEB 2.0, OR Mapping, J2EE Design Patterns scenarios – it is really a healthy situation that those people had spent time to know latest stuffs.

I extended the time to separately discuss J2EE architecture and what components to use at what situations. And also, discussed some architectural design patterns, like Middleware Oriented Architecture, SOA and etc.

After noon, I showed some demos, by loading the J2ME applications into my mobile and running some GUI, Networking applications in my mobile. They felt happy to see the theory was working!


I didn’t go and meet any students. I met some second year students, a month back. They were plain, without having any idea of what to do. But, I told them they would have very bright future than anyone else. Because, opportunities are hell a lot today, you can find another one as soon as you miss one. Getting a job won’t matter any more; But getting a job in your dream company, with fat pay, and interested technology will be tough, unless you work hard – this is what nowadays I say to whomever I meet.

In the evening, a car arrived to IT-Park for pick up. I was picked and the car started running towards Erode. I was filled up with lots of old memories on the way. I first stepped into the college by Aug 10th 2001; On that day, I was clueless, shy, and filled up with lots of questions about everything. I had only a blind confidence towards future. To be frank, I never thought I would live a life, that I am living today. 6 years gone now! I am happy with whatever I have done till today, and whatever the position I am in today.

I am no more connected to this college; but, I can’t deny the memories of those days, that often put me in an unknown silence.

The Architect Dream :-)

In the recent days I became crazy about architecture; better design; better code; As a chain effect,I decided to take up J2EE Architect exam. Sun itself recommends (not mandates) that the candidate should have minimum of 6 to 8 years Java/J2EE experience to appear for this exam. Last Saturday, I decided to take up this exam. I am not sure how dare I was, at the point of time, to take such decision. I booked the exam within 6 days.

My background is: I know EJB concepts/UML/Networking layouts/Server architecture basics. But, this skill is really poor to take up such an exam. I was left with no clue. Sometimes, some strange things happen right! I got a mad curiosity towards architecture and started reading books so fast. I've never read a book that fast in my lifetime, and never had such a capability to understand/interpret/memorize the stuffs. But, it happened. Within 4 days I grabbed the confidence to pass the exam. In the last two days, I went through lots of mock exams, short notes.

I have myself created many Thumb rules for my understanding, from various sources of books, and sites.

Exam questions were really simple and I was able to score more.My score is 95%, missing two questions, on the whole. (good number, isnt it? ;-) )

I don't remember exactly why I choose this exam; I probably would have thought putting a full-stop to the certification hierarchy, because this certification is the highest level of Sun's Java Certification hierarchy. But one thing is for sue -- I like Sun's java exams. They are very good learning aids for Java/J2EE. The syllabus for every exam is designed with great care that the candidate should know the hardcore stuffs in the specific technology.

Refer the exam objectives here:

http://www.sun.com/training/catalog/courses/CX-310-051.xml

Best of ever written, in 4 years :-)

Programs as poems:

If you look at some body’s code, you will see it as a poem, not merely a software program. That’s how they write it. Impressed by those cool programmers, I tend to follow lots and lots of code tricks and style in whatever I write. Recently, I was developing a java based application for my personal use. If you are interested to listen, I could continue telling the best I have don’t in it,

1. No use of Class level (or global) variables. (Because they confuse programmers to trace the parts, where they are initialized & modified.)
2. No hard-coding. (Because, tough to change later)
3. No bad smells in code. (no big methods, no big expressions, no big conditions, no complex loops)
4. Standard, naming conventions (I use some times underscore too, in java. why dont you ask 'why'? )
5. Exception handling – (Anti pattern imitated)
6. Large scale of reusable code. (Seriously)
7. Use of Design Patterns – (that’s a sign of great future)
8. Proper (styled) Java doc comments, (you will be impressed if you see it.)
9. Code refactoring, using tools.(one should really do)
10. Code inspection, using tools. (rare tools)
    

I couldn’t post the code here; I would post the code somewhere & give the link here.

SCBCD (EJB 3.0) The Exam!

I was thinking of taking J2EE/EJB certifications. But, luckily, Sun offered latest EJB exam for free of cost, as it is Beta version. So, was glad, and registered for the Beta exam. But, I didn’t know that the exam was going to bring me ache.

Thousand or more times, I thought of dropping the exam plan later! Since, there are no books into market yet, there are no proper docs, there are no guides, there are many such ‘no’s…

At last (taking it as a big challenge!), today, I sat for the exam. The exam duration was about 5:15 Hrs. I’ve never taken such a long-lasting exam in my life before. I was eager in first hour… then, was boring… then, loosing focus… then…. seriously I vexed at the 5th Hour!

My eyes were paining like anything when I came out of the exam center. I felt dead-tired, and
wherever I looked around, it was ejb, ejb and ejb... nothing else.

The exam was not tough actually. It needs strong understanding of concepts, and a serious preparation. There were damn good questions at which I was stuck, and yanking. How come one can expect some one to study the programming stuffs on a new-year day? But, I studied until the last moment, (seriously.. I was two hours late to the exam hall! :-) )

Result? It will come after some 6 to 8 weeks!

So, I think I’ve done my side well. God, now it’s your turn! ;-)

Tip #3: Difference: Jvm, JRE, JDK, J2SDK, HotSpot...

JVM, JRE, JDK, J2SDK, HotSpot... : These terms are often parts of Java programmers communication. But, it seems.. all such terms sound to mean a same thing – no, they just seem, not really. Let’s discuss and distinguish the terms in detail.

JVM- Otherwise called as 'Java virtual machine' that actually takes the .class file as input, interprets it and executes it. JVM is platform dependent. The java.exe, found in your J2SDK/bin folder is called as JVM!

JRE - JRE includes a JVM and standard libraries (which are imported by default during execution). Note, JRE doesn't include other tools like jdb, javac, javap and etc. It includes only the jvm (java.exe) and default packages. JVM can be thought as a proper subset of JRE.

JDK - JDK is a box in which everything is put together. JDK includes JRE as well as other necessary tools and libraries. You have JRE, JVM and all the standard & extended libraries.

Important differences:

1. The important difference between JRE and JDK is that, Java License allows any one to re-distribute the JRE along with his product. But, it is illegal to re-distribute the JDK with your product!

2. JDK and J2SDK exactly refer to a same thing. But, what is difference? The term ‘JDK’ is just re-branded (re-named) to ‘J2SDK’ to bring a Standard (guts?) to Java. Seriously! :-)

The following simple formulas can help you to understand easily what were said above:

JVM = java.exe
JRE = JVM + Standard Libraries – Other java tools like jdb, javac.
JDK = JRE + Other java tools + all core libraries and packages.
J2SDK = rename (JDK)

Exercise:

The term ‘HotSpot’ is left unexplained. If you are curious to know, Pl, spare some minutes to find out yourself and post the answer as comment.
Or, let me post the answer in next tip.

Java/JDBC Questions

I have prepared set of questions for Java/J2EE (may be helpful to test one's knowledge). Here, first comes the questions from JDBC.

I don't have time to type the answers here:-) Pl, find yourself by reading books or googling or by asking someone who had lost his life in java.

If unable to find answers anywhere, you can directly mail ( or scold) me via: manivannan.p (at) gmail.com

JDBC – Questions: Manivannan.P (at) gmail.com, 14th Aug, 2006.

[For Beginner/Advanced/A bit experts]


1. What are all the available types of JDBC drivers? Give example for each type.
2. Which one of the available drivers is better?
3. Give sample scenarios where you would choose each one.
4. Write a sample JDBC code to connect to any database.
5. What do you understand by Class.forName(“drivername”).newInstance() ? (give alternative syntax for this)
6. What is a Statement and a PreparedStatement?
7. What is the difference between Statement and PreparedStatement. Which one is advisable to use?
8. How will you execute a DML statement using JDBC?
9. How will you traverse the ResultSet?
10. What exception will you probably get when you have no data in Resultset?
11. How will you print Meta data of Resultset like column count, column names and etc.
12. How will you execute a stored procedure using JDBC?
13. How will you pass parameters to stored procedure using JDBC?
14. Can you give example code for using IN, OUT and INOUT parameters stored procedure using JDBC?
15. How will you capture the return value of a function using JDBC?
16. How will you print the warning message, error code, status generated by the database (while using JDBC)?
17. How will you catch/escalate the exception generated by the database?
18. How will you manage the concurrency while using JDBC? (Just write down a sample code)
19. Give example for managing transaction using JTA.
20. How will you make the Resultset become scrollable by back and forth?
20.a) Can you move the Resultset to a particular row absolutely or relatively?
21.b) Can you give an example for inserting/updating/deleting a specified row on ResultSet?
21. How will you apply concurrency for Resultset?
22. How will you refresh the Resultset, without repeating the code?
23. How will you send sql statements in bulk? [Batchupdates]
23.a) How will you capture & analyze the return value of BtachUpdate?
23.b) What is the limitation of BatchUpdate ?
23.c) What is the difference in using Stored procedure and BatchUpdate
24. Can you explain what is connection pooling & how it is implemented? [provide sample code for connection pooling and a client that uses it]
25. What are all the parameters you need to pass while configuring connection pooling?
26. Do you know about two-phase and three-phase commit, can you explain it?
27. How will you handle blob, clob fields using JDBC?
28. Can you write code for storing and retrieving an image file/ text file using JDBC? [hint: using blob and clob]
29. Can you tell any noticeable differences between JDBC1.0, JDBC2.0, JDBC3.0 APIs?


Disclaimer: The questions [or answers] presented here are purely based on my perspective alone. There may be number of alternative answers.

Links, have to be blogged.

1.Good examples for JMS, found here: http://darwingrok.physics.ox.ac.uk:8080/source/xref/JBoss/jboss-all/messaging/src/docs/jms-examples/

2.A wonderful article on JDBC is here: http://java.sun.com/developer/Books/JDBCTutorial/index.html

After reading this, you have to be able to answer for the ques, "what’s the difference between PreparedStatement and Statement? " :)


3.Very good/advanced examples for Oracle+JDBC are waiting here: http://www.oracle.com/technology/sample_code/tech/java/sqlj_jdbc/files/advanced/advanced.html
(I haven’t yet looked at them deeply; but they sound as good future references!)

Don’t miss JBOSS’s Wiki stuffs; there people wrote everything what you call as ‘secrets’!.

Hmmm… few more links, I really forgot!

JNDI Stuffs | EJB Stuffs

Today, I was modifying some EJB JDNI context of my application. , , were the stuffs, kindling my brain today afternoon. I was looking keen at DataSource (javax.sql.DataSource) and its deployment descriptor options. Good design.

It was really great to read the article "Advanced JDBC", at Sun's site. My God!, the article was dated 1999; people are always curious to learn and do things faster!


I am planning to sign-off all Ejb-Stuffs by this week end! I will post some interesting tips, links and articles here tomorrow.

How do I register a project & upload at sf.net?

Hey, Successfully done! I have uploaded my sample project at http://j2ee-examples.sourceforge.net ....

Yeah, Here is the snap shot of my putty. Thanks to Hari, who helped me to get out of the mess!














And this is scp uploading screen-shot



















As I promised, this is the FAQ I present from my experience:

------------------------------------

How do I register a project at sf.net?

First register for a user account. Then, go to ‘My Projects’ column and follow the new project link. It will guide throughout registering a project. After the registration, you have to wait for approval more than 2 weeks. Approval will not be emailed, you have to go and check.

I followed the instructions and successfully uploaded the project using CVS into sf.net. (I mean projectname.cvs.sourceforge.net). But, it is not available for download for other users. What went wrong?

Same sweet first! I was also such an ignorant last week. CVS is for you and for managing your versions. Sf.net doesn’t allow the CVS folder’s or files for download. For uploading projects (which can be downloadable), you can use ‘scp’ or ‘sftp’ (about which we are going to discuss later).

So, how do I upload?

In case of windows, first download putt.exe and scp.exe (use Google). Then, launch the scp like from the command prompt like,

scp -r . username@shell.sourceforge.net:/home/groups/P/PR/PROJECTNAME/htdocs

The command says, “Hey scp, recursively (-r) copy all the files present in current directory (.) to shell.sourceforge.net server, under the directory /home/groups/P/PR/PROJECTNAME/htdocs”

Note: you have to replace the ‘P’ (in the destination directory path) by the first letter of your project name and ‘PR’ by the first two letters of your project name.

htdocs directory is where the htmls files are kept. (like your web root directory). The allocated quota is 5 MB. In the same hierarchy you have cgi-bin directory where you can put your php or cgi scripts.

Then, how do I login and see every thing?

Use either putty or ssh on windows. The host name is shell.sourceforge.net, the port is 22. You have your login and password right? Then, what else! Enjoy.
I can just tell you where you should not try to login. Projectname.cvs.sourceforge.net – This is not for ssh-ing. Only for CVS repository access.

Last time, when I logged in to sf.net, it was successful. Same thing I try now… but the putty is closed saying “connection problem”... but the network is fine …sf.net is ‘Ping’ able from my host …. What went wrong?

(OR)

My ssh gives some strage errors like

‘ssh_exchange_identification: Connection closed by remote host’

Do you want to see more ?

$ ssh -v username@shell.sourceforge.net
OpenSSH_3.5p1, SSH protocols 1.5/2.0, OpenSSL 0x0090701f
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Rhosts Authentication disabled, originating port will not be trusted. debug1: ssh_connect: needpriv 0 debug1: Connecting to channel-e.sourceforge.net [66.35.250.209] port 22.
debug1: Connection established. debug1: identity file /home/csea/.ssh/identity type -1
debug1: identity file /home/mani/.ssh/id_rsa type -1
debug1: identity file /home/mani/.ssh/id_dsa type -1 ssh_exchange_identification: Connection closed by remote host
debug1: Calling cleanup 0x80674d0(0x0)

Now, tell me what went wrong?

Don’t worry. You are not the culprit. Sf.net might have blocked the access. I also got the same error message.
I tried logging after 1 or 2 days. Then, it worked fine. I guess, the access list would have released the lock. Not sure…

All the best!

"EJB3 in Action" by Debu Panda. (Sample chapter)

Debu panda (Product manager for Oracle J2EE server (OC4J), Oracle Corp) is promoting EJB3 a lot. He is writing the book "EJB3 in Action". He is making his effort to explain how simple the EJB3 is.

The sample chapter of the book is out: (http://www.manning-source.com/books/panda/EJB3_in_Action_Draft_ch_02.pdf)

sf.net approved my project and ??

I have registered my Final Year Project and one more project at sourceforge.net under GNU/GPL License. Now, sf.net (=sourceforg.net) approved it.

Links given below may give details:

1. https://sourceforge.net/projects/channel-e
2. https://sourceforge.net/projects/online-exam

Wait, wait... I have not uploaded any files/docs. I am giving final touch up on the source code and docs. With in few days (yes, during this week end) I will host project source/docs.

PS:

I have registered for one more project (J2EE-Examples), which is a simple book store application.

In this project, I will make my effort to follow all the authorised and recommended best practices and design for every J2EE modules.

Also, this project will be a good example for developing Struts based applications.

This project will cover JSP/JSTL, custom taglibs, Struts, EJB (Stateless/Stateful session bean, Entity Beans (CMP, CMR), Message Driven Bean), Java mail API, Junit.

Tools: Jboss/Ant/Mysql.

Probably, at end of this week end, I may be ready with the front end Struts - UI .

EJB 3 spec approved by JCP.

EJB 3 spec was approved by JCP (http://jcp.org) . I hope, Jboss and OC4J (Oracle container for J2ee) are the only servers have implemented ejb 3 so far, if I am not wrong. Now, we can expect to see Ejb 3 on every where in earth soon.

EJB 3 sounds simple. Remote and Home interfaces creation has gone. POJOs will save your life!

Thanks.

Deployment descriptors will be thrashed.

Thank you very much.

There are also some drawbacks (due to these advantages). I am not going to think about them, as they will be recovered as time passes.

I am eagerly expecting Java EE 5 spec to be in action as soon as possible. Then, J2EE will loose its tag “The complex technology”. J2EE will survive for ever then.

(News source: Debu's blog http://radio.weblogs.com/0135826/)

EJB: CMP, BMP, CMR Beans.

CMP, BMP, CMR - I am not going to expand them here and I leave the terms to be expanded by google.

Almost done with CMR bean. Very hectic. Why is it this much complex? I guess it might be simple while working with Eclipse and XDoclet ....etc.

But, I am not going to touch them now. I will prefer using plain old command line technique with the help of the great invention 'Notepad.exe' :)

My articles published.

My article was approved for publishing at javareference.com. I would like to thank Raghul, who spent time to review and publish.

[1] Object eligibility factors for Garbage Collection in Java. http://www.javareference.com/articles/viewarticle.jsp?id=736
[2] Gearing up the JSP Performance. http://www.javareference.com/articles/viewarticle.jsp?id=613

HFSJ is too humorous

I am now diving into HeadFirst Servlets & JSP. I see it like a kinder gardern children's book. Its that much naughty but fires Neurons.
I will write here interesting moments with the book later.

Why Ejb?, Jdk6.0 features

I often think of the situtation to use Ejb. Still I never had a chance to assist ejb code in anywhere. Java people recommend Ejb, when the project scope is really complex and in Enterprise level. Unwanted usage of EJb results in performance, effort & money lost. Surprisingly they say, some alternatives are tried to replace the Ejbs. One more problem with j2ee is integration of different language & s/w. This makes me lazy in learning Ejb. I just touch Ejb, when I have free time & no interest in touching it alone.


theserversid.com lists the new features in Mustang (jdk6).
*embedded Rhino (Javascript) interpreter,
* extending java.io.File to discover free disk space,
* an embedded light weight HTTP server,
* XML Digital Signatures API,
* JAX-WS 2.0, JAXB 2,
* JDBC 4, JMX 1.3,
and a user-requested improvements and big fixes.

But, I see Java is losing its standards...by the name 'flexibility' :-)