Maximum number of EJBs (any limitation?)

Hi,
Does anyone know what is the limitation as to the number of stateless session beans within a J2EE application server (Weblogic or Websphere)? Has anyone tried with hundreds of them in a single EAR? I would appreciate a response of someone who could shed some light about this or could point me to some technical documentation about it.
Thank you,

Hello Alejca,
We have deployed multiple Stateless Session Beans [~20] with Maximum Bean Pool count as 100 and monitored the Performance.
It doesnot affect anything other than the Java Heap Size increases exponentially when the Beans are being used...
You need to take care of the Memory allocated for each Session Bean and consider Hardware Memory upgrade to handle such a load. The Application Server which we used was BEA Weblogic in JDK 1.3.1 Version. Though the JVM is enhanced for better performance and crash proof in JDK 1.4 and 1.5, the 1.3 JVM was able to handle the Bean creation and Garbage collection.
Some simple easy ways to monitor the bean and server performance are :
1. Create a Thread Program for each Bean. Spwan them in 100 of numbers to access the Beans.
2. Have some logic in the Beans so that some server processing is being done rather than simply calling and response coming back.
3. Open WebLogic / WebSphere Java Memory monitoring console to find any problems. You will be able to see that the garbage collection happens when the heap reaches its peak.
4. Moreover, you can also monitor the Bean Creation and Removal in the Bean Monitoring Console in WebLogic. I am not sure if this is available in WebSphere.
Other alternatives to monitor Server stability is to enable and monitor SNMP both in the Server OS level and BEA WebLogic Server level.
If you compare the request to response time, you can identify that the more load you throw in, the response time is more... But in reality if you believe that that is what you expect in you application, try increasing the Bean count or even the Java minimum and maximum memory paramater during startup...
Hope these tips help you. Do let us know what you have found...
Thanks and regards,
Pazhanikanthan. P

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NUMBER OF EJB's

How can I determine the max number of EJB's for a WLS, or for a cluster??
This max number is for EJB's or for instances of EJB's??
Thanks
J.Carlos
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Pat,
You are incorrect, otherwise our whole application would crash during
startup...
We have about 100 different EJBs, most of the entity EJBs having
max-beans-in-cache set to 10000 and more, and yet, we don't have any
problems with that.
The bug you are talking about (4390238 although it's disappeared from
Sun's bug DB) deals with different EJBs and mainly the number of loaded
classes, not EJB instances.
Dejan
Pat Bumpus wrote:
Hi,
I believe it is EJB instance. Therefore it would be the second choice below(the
calculation). BEA Support can give you specifics.
pat
"J.Carlos Ramis" <[email protected]> wrote:
Thanks a lot, but... 300-400 are diferent EJB (only its definition) or
the
number calculated by
number of EJB * max beans (instances of every EJB) * num. WLS in a cluster??
J.Carlos
"Pat Bumpus" <[email protected]> escribió en el mensaje
news:[email protected]...
Hi,
There isn't a maximum number of EJBs that you can deploy on WLS. It
is
constrainted
by the about of memory you have on your box. Having said that, there
is a
JDK
bug that has been reported to Sun (over and over again) which can cause
an
"out
of memory" exception when you have EJBs in the 300-400 range. As far
as I
know
that bug exists in JDK 1.3.
Also, you should review the deployment descriptors (ejb-jar.xml,
weblogic-ejb-jar.xml).
See http://e-docs.bea.com/wls/docs70/ejb/reference.html. There are
settings
which allow you to regulate the number of EJBs in cache etc.
To find more about the JDK bug mentioned above open a case with BEA
support and
ask them for information about the Sun bug with 300-400 EJBs and setting
MaxPermSize
as a workaround.
Hope this helps,
pat
"J.Carlos Ramis" <[email protected]> wrote:
How can I determine the max number of EJB's for a WLS, or for a cluster??
This max number is for EJB's or for instances of EJB's??
Thanks
J.Carlos
====================================================================
"Este mensaje y los documentos que, en su caso, lleve anexos, pueden
contener información confidencial. Por ello, se informa a quien lo
reciba por error que la información contenida en el mismo es reservada
y su uso no autorizado está prohibido legalmente, por lo que en tal
caso le rogamos que nos lo comunique por la misma vía o por teléfono
(981138847), se abstenga de realizar copias del mensaje o remitirlo
o
entregarlo a otra persona y proceda a borrarlo de inmediato."
====================================================================
J. Carlos Ramis Oliver
[email protected]
Altia Consultores
====================================================================

Is there any limitations to the maximum number of dimensions in MP?

hi all
Is there any limitations to the maximum number of dimensions can be created in Multi provider. If so how what is the maximum number of dimensions that can be created in a multi provider?
regds
haritha

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Any limitation number of columns on SQL Workshop Utility Upload Data ?

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Kamala kannan.c| Please remember to click “Mark as Answer” or Vote as Helpful if its helpful for you. |Disclaimer: This posting is provided with no warranties and confers no rights

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Maximum number of EJBs (any limitation?)

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