JCA is not only directed to DB-stuff. See chap 7 in the examples in the pay for 
doc for 3.2 for instance. (an example of an filesystem access adapter.)

Vanilla EJB is restricted in many way, for instance you are not allowed to 
access disk, create threads etc. A way to get around these restrictions and 
still go with the spec, is to write a JCA. Your JCA does not have to support 
features that you do not need (DB-like behaviour, transactions, CCI and so on) 
Though the possibillity to support EJB transactions, CCI makes them even more 
useful. I have written a few adapters which only uses the connectionpool 
properties, since that was what I needed at the time. 

If you need more info: I have looked at an article written by Willy Farrel 
called "Introduction to the J2EE Connector Architecture" It is geared to 
Websphere, but combined with the example, it will propably clear things out. As 
I remeber, also the Sun J2EE tutorial is OK. There is also a book "J2EE 
Connector Architecture and Enterprise Application Integration" by Rahul Sharma, 
Beth Stearns, Tony Ng which points out the details.
 

/ JÃrgen



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