Getting a reference to a Kotlin function as a Java Method

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?

Rich · Accepted Answer · 2016-04-23 20:51:58Z

8

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>

edited Apr 23, 2016 at 20:51

Rich

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answered Apr 23, 2016 at 16:01

yole

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1 Comment

Rich Over a year ago

Thanks for this. The javaMethod property is part of the kotlin-reflect.jar which isn't the same as the standard library. While I was aware that there was a reflection library, seeing that javaClass was part of the standard library made me assume that javaMethod would be too.

Art Shendrik · Accepted Answer · 2016-04-25 07:24:00Z

0

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)

answered Apr 25, 2016 at 7:24

Art Shendrik

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