Repository functions can return null elements in collections

[Carlrs]

It's possible to get null elements in a collection of non-nullable elements (using Kotlin). No idea why Kotlin isn't complaining about it either until I try to access an element, but here are the steps for reproducing:

1. Have database view with ID that is a composite of multiple columns, one of which is null (rendering the entire ID for that row as null)
2. Have repository interface for said view, with the entity's ID as a nullable value of type String
3. Repository interface should have some function that returns List (non-nullable!)
4. Call repository function, try to iterate over the results doing something that requires the elements to be not null
5. Get java.lang.NullPointerException

Expectation: Either the collection won't include the DB view rows where ID is null, or it'll have the entity ID as null, but either way, there should be no null objects in the returned collection.

[mp911de]

Thanks for your report. Which Spring Data module is affected for you? Can you provide a bit of code?

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