Search code examples
javakotlinkotlin-interop

Make proxy on Kotlin class from a Java library using ASM

I have a Java library that creates a proxy using ASM.

At one point, user sends a Kotlin class to it. I can detect it is a Kotlin class from Java, but I don't know how can I make a proxy from it? Everything what I read from such class is meaningless.

The scenario is the following

  • user sends a Kotlin class
  • I make a proxy
  • finally, I make an instance of such class

what would be the best way to do so?

EDIT

I just realized that one of the reasons why I can't override Kotlin functions is because they are generated as final methods in the bytecode. Is there a way to tell Kotlin not to do so?

Solution

  • The issue I had was that generated classes and methods are final. The ASM code I am using was not processing final methods as they can not be overwritten.

    The solution is to mark classes and functions in Kotlin as open. You can do this manually or using all-open plugin.

    Here is a page that explains the issue: https://blog.frankel.ch/open-your-classes-and-methods-in-kotlin/