The SpinnerValueFactory has an implicit no-arg constructor, which as a result shows up in the API docs without any documentation associated with it.

If there are no explicitly defined constructors in a Java class, the javac compiler will generate a public, no-arg constructor for you. This is an anti-pattern for classes that are part of a library's public API. It can lead to unexpected results, such as a public constructor mistakenly being exposed, or if it was intended, it can disappear if you add another constructor without explicitly defining the public no-arg constructor at the same time.

Additionally, the implicit constructor will have no API docs associated with it.