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kotlinlang

i'm having some trouble with type inference again :thinking_face: 
i have a functional interface (java)

```
@FunctionalInterface
public interface ConnectHandler {
    void handle(Session session);
}
```
and a function which uses it:

```fun onConnect(connectHandler: ConnectHandler) {
    this.connectHandler = connectHandler
}```

and i get:

```Type mismatch.
Required: ConnectHandler
Found: (???) → Unit```

when calling this code from kotlin.. i suspect it might work if i convert the function to a java-method, but why is this required?