获取对Kotlin函数的引用作为Java方法

Question

I have a Java method that takes a Method parameter:

void doSomethingWithMethod(Method m) {
    ...
}

And I have a Kotlin class that contains a function:

class MyClass {

    fun myFunction() : List<Something> {
        ...
    }

}

I can get a reference to the function with MyClass::myFunction , but I don't see a way to pass it into the doSomethingWithMethod method. Is there an equivalent to the .java property that can be applied to a Kotlin class reference to get its Java equivalent?

If not, is there a workaround?

Answer 1

import kotlin.reflect.jvm.javaMethod

val method = MyClass::myFunction.javaMethod

The javaMethod property is not part of the standard Kotlin library, but is part of the official kotlin-reflect.jar . It can be added through Maven with the following dependency:

    <dependency>
        <groupId>org.jetbrains.kotlin</groupId>
        <artifactId>kotlin-reflect</artifactId>
        <version>${kotlin.version}</version>
    </dependency>

Answer 2

You can use standard java reflection to get Method in kotlin:

MyClass::class.java.getMethod("myFunction")

or

MyClass::class.java.getDeclaredMethod("myFunction")

Need no dependencies to do so.

Docs:
Method getMethod(String name, Class... parameterTypes)
Method getDeclaredMethod(String name, Class... parameterTypes)