Hi all,
Around 5 months ago we embarked on a project for one of our major
clients. While
doing the design and planning for this project, we came across jboss and some
of its
pioneering frameworks such hibernate, seam and the latest ejb 3.0 which was
just what we
were looking for. As such, we stared building a web application using these
frameworks and
our main aim was to use JBoss Seam and Hibernate to speed up development of the
application
using EJB.
While the first phase was hardwork, especially with the initial configs we had
to make, we
were satisfied with the way Seam was helping us in the development. Our project
structure
is as follows:
Models - Entity Beans generated using Hibernate Tools with Annotations
Controllers - This part consisted of two layers :
- One layer for DataAccessObjects which consisted of SLSB and is
aimed at
containing all hibernate specific code that return entities
- Another layer for Actions which consisted of SLSB and SFSB and is
aimed at
interacting with the View layer
View - All JSF/Facelet components
Our approach was to have the the view model fetching information from the
Action Layer
which in turn calls the DAO layer when querying DB
We were not too familiar with CONVERSATIONS at that time and implemented our
SFSB without
this feature.
While the above approach works fine, we are getting some performance related
issues :
(1) We get Out of Memory Leaks related to the PermGen Space. We have managed to
have a
workaround for this by increasing the MaxPermGen size. However, we fear this
might only be
a temporary fix
(2) The application is really slow because of the amount of Session beans that
are involved
in it and the amount of code that hibernate autogenerates when fetching
dependencies. There are no heavy graphics involved.
We would like to know if the above problems can be solved by :
(a) Implementing conversations ( Will this improve response time)
(b) Porting the application to Tomcat running embedded-ejb can improve the
response time
Any other suggestions are also most welcomed.
We are on a tight deadline and would really appreciate any help on this from
you experts.
Best Regards,
Yogesh Jankee,
M-ITC LTD
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