If I have a kotlin class that takes a function as ...

# announcements

[Luis Munoz]

If I have a kotlin class that takes a function as an argument (a block). How do I initialize that class from java, link to documentation might suffice. I don't see that in https://kotlinlang.org/docs/reference/java-interop.html ?

[Shawn]

You should just be able to pass in a lambda from the Java side

[Shawn]

or method reference if applciable

[Luis Munoz]

return new SuspendingBatchingPublisherImpl<UnsubscribeEvent, UnsubscribeEventList>(
subscriptionRabbitTemplate(),
(list) -> new UnsubscribeEventList(list),
(eventList) -> eventList.getEvents().size(),
applicationProperties.getUnsubscribeMessages()
);

[Luis Munoz]

not working for some reason

[Luis Munoz]

class SuspendingBatchingPublisherImpl<T, R>(
private val rabbitTemplate: RabbitTemplate,
private val eventBatchingProperties: EventBatchingProperties,
private val batchFunction: (items: List<T>) -> R,
private val batchLength: (R) -> Int
😞 CoroutineScope {

[Luis Munoz]

error is :

[Luis Munoz]

UnsubscribeEventList cannot be applied to lambda parameter

[Luis Munoz]

(list) -> new UnsubscribeEventList(list), highlights the second list

[Shawn]

what’s the signature on the Kotlin side?

[Luis Munoz]

shown four lines up, first code block is java calling site, and second is kotlin signature

[Shawn]

oh my bad