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I've been trying to find an efficient way to represent nested data in java/hibernate. My initial solution was a parent/child list with a self referencing join, but there are obvious pitfalls to this technique when building reports in SQL. I was looking into nested set and materialized path, but I was hoping there would be a way to represent nested data native to hibernate that is also efficient to query via SQL.

Billworth Vandory
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If you could have your nested data in the form of an inheritance hierarchy then you can have a look into the Inheritance Mapping Strategies of Hibernate. I've used them and if configured well then they are quite good.

kaychaks
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