I have a method that accepts java lang reflect Method and I kotlinlang #announcements

I have a method that accepts java.lang.reflect.Method and I'm trying to check whether the method is returning a nullable type or not (via 'kotlinFunction.returnType.isMarkedNullable'). However, for data classes, there are the componentX() methods and the corresponding getter methods, getXXX(). Interestingly for getter functions there is no kotlinFunction.

diesieben07

05/25/2017, 1:25 PM

wjur: Kotlin does not really see those as functions, they are part of the property. So they are a

KProperty

, not a

KFunction

wjur

05/25/2017, 1:32 PM

I see. Anyway I need to link a getter with a property 😞

I'm writing a module for jackson.

The

JsonProperty

annotation has a

required

property, which defaults to

false

diesieben07

05/25/2017, 1:35 PM

Not sure I am following you, what do you mean by "link"?

wjur

05/25/2017, 1:36 PM

In Kotlin and data classes, this makes a little sense, because it is

isMarkedNullable

that defines whether the property is required or not.

Consider a sample json model:

Copy code

data class Model(
    @JsonProperty("name")
    val name: String
)

The property says that name is an optional field

while the field is required because is of a non nullable type

diesieben07

05/25/2017, 1:39 PM

Ok, so, you want to go from the java.lang.reflect.Method for the getter to the corresponding KProperty?

wjur

05/25/2017, 1:40 PM

Yes

diesieben07

05/25/2017, 1:42 PM

Since there is only a way to go from Kotlin reflection to Java reflection you have to get all the properties in the class and search through them until

property.getter.javaMethod == yourMethod

wjur

05/25/2017, 1:44 PM

It's working!

You saved The World!

Thank you so much!

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