Home » Tag Archives: Mapped Collections

Tag Archives: Mapped Collections

Avoid Lazy JPA Collections

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Hibernate (and actually JPA) has collection mappings: @OneToMany, @ManyToMany, @ElementCollection. All of these are by default lazy. This means the collections are specific implementations of the List or Set interface that hold a reference to the persistent session and the values are loaded from the database only if the collection is accessed. That saves unnecessary database queries if you only ...

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Hibernate mapped collections performance problems

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First things first, this article was inspired after Burt Beckwith‘s presentation about Advanced GORM – Performance, Customization and Monitoring at SpringOne 2GX on Jan 27, 2011. In short, Burt Beckwith discusses potential performance problems using mapped collections and Hibernate 2nd-level cache in GORM, along with strategies for avoiding such performance penalties. Nevertheless the performance issues regarding mapped collections that Burt ...

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