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Hibernate: Best way to fetch an association defined by a subclass
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EntityGraphs and JOIN FETCH clauses provide an easy and efficient way to fetch an entity and initialize its associations. But if you try to use it with a domain model that uses inheritance, you will quickly run into an issue:
You can’t use this approach in a polymorphic query to fetch an association that’s defined on a subclass. Or in other words, your JOIN FETCH clause or EntityGraph needs to reference an entity attribute that’s defined by your superclass. Otherwise, Hibernate will throw an exception because the attribute is unknown for some subclasses.
In this video, I will show you how to avoid this issue using your 1st level cache and multiple queries.
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#Hibernate #associations #1stLevelCache
You can’t use this approach in a polymorphic query to fetch an association that’s defined on a subclass. Or in other words, your JOIN FETCH clause or EntityGraph needs to reference an entity attribute that’s defined by your superclass. Otherwise, Hibernate will throw an exception because the attribute is unknown for some subclasses.
In this video, I will show you how to avoid this issue using your 1st level cache and multiple queries.
Like my channel? Subscribe!
Join the free Member Library:
Want to connect with me?
#Hibernate #associations #1stLevelCache
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