Choosing among ejbSelect or find?
There is another interesting difference related to the transaction context under wich an ejbSelectXXX() or findXXX() method is executed.
The ejbSelectXXX() methods are executed in the transaction context of the method that is actually using it, while the findXXX() execute according to their own attributes (as specified by the bean provider).
Nikos Argiropoulos has also added two additional differences:
The ejbSelectXXX() method can return a single or a collection of objects of any type e.g Strings when the finded returns only single or collection of component or local component interfaces.
When calling the ejbSelectXXX method from the wrapping business method, you can pass to it arguments related with the particular instance of the EJB. In the findXXX this cannot be done.
Deciding when to use one and when the other, is really up to the developer. The ejbSelectXXX() seems to be a little bit more powerful. Is important to remember that it cannot be used by the client.