Why using EJB when we have BC4J ?
Hello everybody
When I heared about EJB two years ago, I read couple of articles about it and found it useful. Now, when I read about BC4J and the ability they give us, a question pops up into my mind. Why should we use EJB ?
We can simple use BC4J and they are very good. I think there is something about EJBs that I dont know and thats why I think this way.
I'll appriciate any help.
Thanx in adnvace.
BC4J is a J2EE framework that lets you get down to business and focus on building your application.
It then gives you a choice of deploying your application using simple Java classes, or using an EJB Session Bean if you want to take advantage of EJB Session Bean's container-managed transaction (for example, to particpate in a transaction with another bean you didn't write), or method-level security.
The key points are that it saves J2EE developers tons of time by allowing them to not waste their time on writing application plumbing code to implement the many J2EE Design Patterns that all real-world applications need.
Around 800 Oracle Applications developers inside Oracle are using the BC4J framework to get their self-service web applications to market with better features in faster time than their competitors. The framework is filled with nuts-and-bolts application-building features that our own developers have told us are the boring, mundane, plumbing-kinda code that they don't WANT to write, debug, and test themselves.
It gives you a big advantage and allows you do decide whether or not to use EJB at deployment time instead of forcing you to make that decision up front.
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Could someone please let me know why should we use EJB classes in web applications instead of normal classes for executing business logic?
Thanks and regards.
SohamWhile I agree that most people using EJB's could have
built a better solution, I think both of the above
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Not at all... You just don't get the point...
Most problems to which EJBs are applied are not problems to which EJBs should ever have been applied at all.
Before answering your question though, keep in mind
there are at least 3 types of EJB's, and all are
completely different. So I can only answer your
question at a high level. Here are the reasons people
might use EJB's:
And according to the specs you use them all or you don't use EJB...
They are container managed.Granted
They offer transactional awareness in your app.So can other solutions.
They are secure.Only as secure as you make them.
And you then tie yourself into a security system that may not be at all compatible with the ones you have already requiring expensive work to link several disparate systems together.
They are pooled, which makes them fast and eliminates
excessive object creation/deletion.There's many other things that are pooled.
They scale well in clustered/distributed environments
(as mentioned above).Clustered environments are indeed the only places where EJB have a definite advantage.
They abstract you from database access (yeah!).So do other technologies
They decouple you from the database so you can switch
from Oracle to MySQL with little or no impact and/or
changes to code (only driver changes).
That's exactly the same reason as above.
I've written my own abstraction layer once which worked faster and simpler than EJB.
We're now using another abstraction layer which does the same.
Use any ORM tool and you have an abstraction layer that's a lot easier to use than EJB, and a lot better performant.
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architecture12 wrote:
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