Friday, 27 January 2012

JPA/Hibernate error: cannot simultaneously fetch multiple bags

Solution: replace all instances of List (ArrayList) by Set (HashSet)


First read StackOverflow for the reason behind the error (tip: JPA annotations are parsed not to allow more than 2 eagerly loaded collection). Definitely read the excellent article of explodingjava about the problem and an in depth analysis how to solve it.

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