Is it not possible to inject mutually exclusive instances of the same type?  At 
first thought, the @Role solution seems awkward.  I have been thinking about 
this same type of scenario, for a project still in the early stages of thought. 
 I thought I might try using a discriminator column, to provide different 
subtypes.  I've used this in Hibernate and another ORM api but have not tried 
it with JPA/EJB3 yet.

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