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Asked: 2026-05-26T01:59:53+00:00

I have two different persistence units in my application. I’m using JPA 2.0 with

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I have two different persistence units in my application. I’m using JPA 2.0 with Hibernate as my entity provider. In one of my database schemas, I have a table which contains a column which has a foreign key relationship to a table in the other schema. These tables are mapped as separate entities in my code with no relationship. Is it possible to construct a named query to join across these two schemas?

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  1. Editorial Team

    No, it’s not possible. You have a few options, not all of them will be useful for your case:

    • You can do the join yourself in code – it might seem ugly & dirty, but this is the way to go if you don’t want to mix two domains and it’s very doable if the datasets are small.
    • You can move the entitiy from one PU (or schema) to the other
    • If the DB supports views, you could create a view of the table from the other schema.
    • You could map the same data table twice (once per each PU) – This might give you a headache with caching.

    As a rule of thumb, if you have a FK between schemas, you have a problem with how the domain was divided, as the boundaries are not exaclty right.

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