WebJun 24, 2024 · expecting a value for non-nullable variable: id of type: uuid! in variableValues This is the mutation that is called inside React: mutation updateUserProfile ( $id: uuid! $user_profile: user_profile_set_input! ) { update_user_profile_by_pk ( … WebJul 5, 2024 · Your variable static List categories; is a List type. Since its non-nullable, the value it holds can never be null. So from the initialization you need to supply a value. You can solve this in a few ways. The easiest would be to give an initial value: static List categories = [];

Calling Java from Kotlin Kotlin Documentation

WebWhen you want to guarantee that a variable’s value will be present - that is, when the value is required - then give the variable a non-nullable type. When you want to allow a variable’s value to be absent - that is, when the value is optional - then give the variable a nullable type. In Kotlin, nullable types end with a question mark. WebApr 24, 2024 · Type nonNullableTypeOf (T? object) => T; void main () { int x = 42; int? y; print (nonNullableTypeOf (x)); // Prints: int print (nonNullableTypeOf (y)); // Prints: int } If you have only T? itself (the Type object), then I'm not confident that there's much you can do since what you can do with Type objects is very limited. towns in saratoga county ny

Nullable & Non-Nullable Types

WebNov 7, 2008 · This means that if a variable's type is a reference type, the variable is automatically a reference. Value types (e.g. int) by default do not have a concept of null. However, there is a wrapper for them called Nullable. This enables you to encapsulate the non-nullable value type and include null information. The usage is slightly different, … WebJan 20, 2014 · To exclude Map with only `null` value, you would use both annotations like so: public class Bean { @JsonInclude(value=Include.NON_EMPTY, content=Include.NON_NULL) public Map entries; } Similarly you could Maps that only contain "empty" elements, or "non-default" values (see Include.NON_EMPTY … WebFeb 15, 2024 · The variable may only be dereferenced when the compiler can guarantee that the value isn't null. These variables may be initialized with the default null value … towns in santorini