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JPA and EJB lazy initialization fields

原文 2013-11-15 07:59:25 7 1 java/ jpa/ ejb/ lazy-initialization

I use jpa (eclipselink) + ejb(3) in my project, when i switch off transactions on ejb method there is a problem with a lazy loading. If i try to Eager loading that's ok, but a it have more time to wait. How do you solve problems like that? I think there are 2 methods:

Use the bean management transactions, and load the fields in that transactions (it's difficult because a lot of legacy code i have)
Use the eager initialization in entities.

Do you have any other ideas?

Thank you!

1 answers

Not a good idea

2 .Eager loading is not a good idea too, because the risk to load the whole database into memory is really high.

If its possible try to create (named)queries with fetch joins ( see http://www.kumaranuj.com/2013/07/jpa-2-fetch-joins-and-whether-we-should.html ) which only loads data you really need for further processing.

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JPA and EJB lazy initialization fields

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1 answers

solution1 2 2013-11-15 08:08:18

solution1
2 2013-11-15 08:08:18