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There is a newer version: 8.9.0.37768

Using a wildcard as a return type implicitly means that the return parameter should be considered as read-only but without any way to enforce this contract. 
Let's take the example of method returning a "List<? extends Animal>". Is it possible on this list to add a Dog, a Cat, ... we simply don't know. The consumer of a method should not have to deal with such disruptive questions. 
Noncompliant Code Example

List<? extends Animal> getAnimals(){...}