Home » Tag Archives: Mapped Collections

Tag Archives: Mapped Collections

Avoid Lazy JPA Collections


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 ...

Read More »

Hibernate mapped collections performance problems


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 ...

Read More »

Want to take your Java skills to the next level?

Grab our programming books for FREE!

Here are some of the eBooks you will get:

  • Spring Interview QnA
  • Multithreading & Concurrency QnA
  • JPA Minibook
  • JVM Troubleshooting Guide
  • Advanced Java
  • Java Interview QnA
  • Java Design Patterns