Error EJB:010116 and what is the best fix?

Question

I got an EJB:010116 error and need some advice on how to fix it (quickly, I am
running out of time).
My basic understanding of the problem is:
1. I defined a many2many relationship with a join table, say ProviderEJB to ProviderKeyEJB,
the cmr field for ProviderEJB is providerKeys and a correcponding abstract method
with default transaction-attribute (not specified):
abstract public Set getProviderKeys();
2. generated code with ejbgen 215
3. deployed to weblogic 8.1 SP1 JDK141_03
4. at run time, my facade session ejb find a local ejb instance of ProviderEJB,
call its method getProviderKeys() to get a set of local instance of ProviderKeyEJB.
all works OK up to this point.
5. then the facade session ejb try to iterate through this set of object and at
this point I got an exception from weblogic:
java.lang.IllegalStateException: [EJB:010116]Attempted to access the collection
valued cmr field, 'providerKeys' for bean 'ProviderEJB', outside of the scope
of a transaction. All access to the collection must be performed during the transaction
in which the collection was initially retrieved.
6. Very clear message. I can understand the meaning of it. However, the getProviderKeys()
method was declared abstract and was generated and implemented by ejbgen. So how
can I access this collection INSIDE of the transaction?
In general, does that mean I will have to turn off the transactions on my entity
beans and let the facade session ejbs to manage the transactions? if so, why do
I need the CMP entity beans in the first place?
So assume I have to do this way, does that mean I have to add the ejbgen tag "transaction-attribute
= Supported" for those methods that I do not want to have a transaction?
On another separate issue, just read weblogic 8.1 doc on ejbs and it recomends
that do not use facade session beans and DTO (value objects) from the web tie,
simply access local entity beans directly. Any experience on this, in terms of
design issues. Obviously I understand it will go faster without a facade, but
what about clean architect of your software design?
Many thanks and best regards.
Charles

Answer 1

Hi,
for this particular case, you should implement a transfer routine at IObj level (general TAB in RSD1/0MATERIAL)
the code is as easy as
TRANSLATE RESULT TO UPPER CASE.
RETURNCODE = 0.
this will be executed whenever you load 0MATERIAL.
hope this helps....
Olivier.