I'm using Oracle DB as RDBMS, and I want to access, via my JSF2 application, to two database schema.
So, I think I must use two <persistence-unit> in my persistence.xml ?
two persistence units for two schemas?
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If accessing two database schemas means just that some of the entities should be in different schema, that can be easily done with Table annotation:
If those schemas need different credentials to access (or different datasources to be used), then defining two persistence units is way to go.