Re: Does jBoss work on iSeries?

[Dieter Bender <dieter.bender@xxxxxxxxxxxx>]

Joe,

<snip>
> > But you will get more scalability with ejbs than without and you will
>
> get
>
> > some benefits for your design.
>
> Says who?  Why do you think all the overhead of EJB will somehow
> translate to scalability?  In fact, every application designer I've
> talked to points to EJB overhead as the primary reason their
> applications DON'T scale.
</snip>

The ejb container easily can have its own jvm, could run on more than one 
system and could use more than one jvm, if it has load balancing. Today its 
much cheaper to have multiple cpus than having a bigger processor.

Further on, I have made some project reviews of java projects in the last two 
years and the projects with ejbs had the better seperating of layers compared 
to the projects without ejbs.

Dieter Bender

>
> Instead, the only real benefit of EJB is some level of database
> independence, and that is only if you use CMP.  Unfortunately, CMP has a
> number of design flaws, especially in commitment control, that make it
> all but unusable in transaction-oriented business applications.  And
> while BMP can be tuned to some level of acceptable performance, you then
> lose basically all the benefits, however meager, of the EJB design.
>
> No, even if you go on the pure Java boards, you'll see that more and
> more the EJB architecture is being replaced by lightweight ORM engines
> such as Hibernate.  If you continue to use EJB, you do it at your own
> peril.
>
> Joe
>
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-- 
mfG

Dieter Bender


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