nullable
Speech parts
1. nullable - Noun
2. nullable - Adjective
Meaning
That may be nullified; nullifiable.
(computing, of a variable or object) That is allowed to have a null value.
nullable (plural nullables)
(computing) A variable, etc. that is allowed to have a null value.
Examples
To eliminate all rules of this form, first determine the set of all nonterminals that derive ε. Hopcroft and Ullman (1979) call such nonterminals nullable, and compute them as follows: * If a rule A → ε exists, then A is nullable.
Hurray for nullable types!
So, when you see Kotlin complaining about nullable types coming from Java, all you need to do is run KAnnotator once on that Java library, and it will turn your red code green.
Take care not to confuse nullable types with the null-conditional operator.