You can use a String variable as long as it's labeled final.

For Example:

  | public class MyClass
  | {
  |     private final String persistence_unit_name = MyNameFinder.getName();
  |     
  |     @PersistenceContext(unitName=persistence_unit_name)
  |     EntityManager em;
  | 
  |     ...
  | }
  | 

Where MyNameFinder.getName() is a static method that retreives the name from a 
file (or however you want to do it).

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