JPA Blaze criteria with entityview - selective output

[adamzrk]

I am using blaze persistence framework with entityviews. Suppose I have enetity view like

@EntityView
interface User {
   String getName();
   String getMobile();
   List<Address> getAddresses()
}

And, based on search criteria, I would like to have all the data in the results or some part of data data - i.e. user without addresses if those are not to be displayed in the output. Is there a way to achieve that in the code? I am interesed in blaze persistence mostly but standard jpa/hibernate is also an option.

[beikov]

Yes, you can fetch a data subset. Also see https://persistence.blazebit.com/documentation/1.6/entity-view/manual/en_US/index.html#fetching-a-data-subset

[adamzrk]

Thank you for reply, but is there possibility to fetch collections like in the documentation?
I have problem when doing:
entityViewSetting.fetch("adresses");

which is mapped in my main entity view as

@Mapping(value = "adresses", fetch = FetchStrategy.MULTISET)
Set<AdresseView> getAdresses();

when I get the resultList from criteria then exception is thrown:

Caused by: java.lang.ClassCastException: class java.util.HashSet cannot be cast to class java.lang.String (java.util.HashSet and java.lang.String are in module java.base of loader 'bootstrap')

[beikov]

Looks like a bug. It should work with the JOIN strategy though.

[adamzrk]

Thabk you bitllut thats not good as I need multiset for relations/collections and I cannot achieve that using join.

[beikov]

Please create a reproducer application that shows the issue e.g. based on one of our quickstarts and attach that to a new issue on GitHub.