Re: [eclipselink-dev] Loading multiple persistence.xml files

[Tom Ware <tom.ware@xxxxxxxxxx>]

Hi Carl,

  Are you using separate EntityManagers for each persistence unit?

  An EntityManager represents one persistence unit - when the 
EntityManagerFactory is created, you get it by persistence unit name.  Any 
EntityManager created by that factory will represent that persistence unit.

  The name of a persistence unit is specified in the persistence.xml and only 
one persistence.xml may be used to define a given persistence units.  It is an 
error to have multiple persistence.xml that define the same persistence unit and 
the behavior is undefined - I am not surprised that if you are doing this, you 
get the last one loaded.

  To access different persistence units, create an EntityManager for each.

-Tom

Carl Hall wrote:
> I have a setup where multiple project come into a shared classloader.  
> Each project can have its own model files and thusly its own 
> persistence.xml and orm.xml files.  When I create an EntityManager, I 
> see in the logs that each persistence.xml file is found (3) and each 
> orm.xml file loads with the expected entities.  When I try to query or 
> persist using this EntityManager, only the entities from the lastly 
> loaded persistence.xml is found.  Am I loading this correctly?  Am I 
> trying to access things incorrectly?
>
>
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