Under What Circumstances Would You Recommend the Use of EJB?

[Mike Duffy <md...@yahoo.com>]

Thank you Harm.

I agree with your assessment of JBoss.  JBoss is also a great value (although I think they should
charge some nominal fee to insure the viability of their organization; see Alan Williamson's
August editorial in JDJ).  :)

Under what circumstances would you recommend the use of EJB?

Mike


--- harm@informatiefabriek.nl wrote:
> For what it is worth, I think JBoss is great. It is a very mature 
> application server. 
> People who claim it's crap obiviously don't know what they are talking 
> about. 
> I agree, JBoss is not the only application server around, and maybe not 
> the best application server.
> 
> But to claim it is "crap" is definitly wrong. Especially if you don't back 
> up your staments with some arguments. 
> 
> JBoss is great to develop on (hot deployment), it's very fast, it comes 
> with 2 integrated Servlet containers (Jetty or Tomcat), a great management 
> interface (jmx-console), and I could go on some more.
> 
> Cheers,
> 
> Harm de Laat
> Informatiefabriek
> The Netherlands
> 
> 
> 
> 
> "Brian McSweeney" <br...@aurium.net> 
> 10/09/2003 03:37 PM
> Please respond to
> "Struts Users Mailing List" <st...@jakarta.apache.org>
> 
> 
> To
> "'Struts Users Mailing List'" <st...@jakarta.apache.org>
> cc
> 
> Subject
> RE: ejb's and tomcat
> 
> 
> 
> 
> 
> 
> I agree, but I was responding to your "jboss is crap" statement, which
> also has little to do with entity beans.
> 
> -----Original Message-----
> From: Mark Galbreath [mailto:mgalbreath@dirtroad.net] 
> Sent: 09 October 2003 11:41
> To: Struts Users Mailing List
> Subject: RE: ejb's and tomcat
> 
> That's an improvement, but really has little to do with EJB entity
> beans.
> 
> -----Original Message-----
> From: Brian McSweeney [mailto:brian.mcsweeney@aurium.net]
> Sent: Thursday, October 09, 2003 8:33 AM
> To: 'Struts Users Mailing List'
> Subject: RE: ejb's and tomcat
> 
> 
> Can't really agree with that. Besides, jboss have just employed the 
> creator of hibernate and its CMP layer is going to be powered by 
> hibernate in the near future anyway. So if you're a fan of hibernate,
> you'll get the same thing under the hood with jboss and CMP ejbs. 
> 
> -----Original Message-----
> From: Mark Galbreath [mailto:mgalbreath@dirtroad.net] 
> Sent: 09 October 2003 11:08
> To: Struts Users Mailing List
> Subject: RE: ejb's and tomcat
> 
> JBoss is crap, anyway.
> 
> -----Original Message-----
> From: Brian McSweeney [mailto:brian.mcsweeney@aurium.net]
> Sent: Thursday, October 09, 2003 7:44 AM
> 
> This isn't the case for jboss at least. You gain major performance
> increases.
> 
> -----Original Message-----
> From: Mark Galbreath [mailto:mgalbreath@dirtroad.net] 
> Sent: 09 October 2003 10:35
> 
> Yes, the advantage of using local interfaces in EJBs is avoiding the
> creation of stubs and skeletons, use of RMI and serialization.  But what
> many people don't realize is that all the major containers have been
> doing
> this since 1.1 anyway, abeit in proprietary ways.  You really gain no
> performance advantage by explicitly declaring an EJB interface local -
> you
> merely adhere to the specification.
> 
> Mark
> 
> -----Original Message-----
> From: Kunal H. Parikh [mailto:kunalp@carsales.com.au]
> Sent: Wednesday, October 08, 2003 8:20 PM
> 
> The CMP2.x spec allows declaring EJBs as local objects.
> 
> The advantage of the local EJB objects is that they don't get
> serialized/deserialized(I think) and pass-by-reference and not by-value.
> 
> Effectively, If you use a LocalEJB, you have the flexibitly of making
> the REMOTE with very few changes to code.
> 
> 
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Re: Under What Circumstances Would You Recommend the Use of EJB?

[Ted Husted <hu...@apache.org>]

Mike Duffy wrote:
> Under what circumstances would you recommend the use of EJB?

This might help you out:

http://www.theserverside.com/resources/article.jsp?l=Is-EJB-Appropriate

If you are still undecided, you will probably want to read a book like 
"Bitter EJB" to get the full picture. It is not a casual decision that 
can be answered on a list like this.

No matter what you do, it's a very good idea to encapsulate the data 
access behind a solid DAO layer. One that you can use "out of the box", 
with or without EJB is the iBATIS DAO framework <http://ibatis.com>. 
It's bundled with with SqlMap stuff, but you don't need to use SqlMaps 
to use the iBATIS DAO.

The JPetstore3 example <http://www.ibatis.com/jpetstore/jpetstore.html> 
shows how you can integrate the DAO framework with Struts, and also 
switch back and forth between EJB and non-EJB implementations just by 
changing a value in a properties file. Sweet.

HTH, Ted.


-- 
Ted Husted,
   Junit in Action  - <http://www.manning.com/massol/>,
   Struts in Action - <http://husted.com/struts/book.html>,
   JSP Site Design  - <http://www.amazon.com/exec/obidos/ISBN=1861005512>.



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