Display the state information to a list of participants dynamically

Question

I have tweeked the Yo- CordApp to send to a list of participants instead of single participant in the target. I would like to send the YO to more than one Party, moreover I just want to display the state information to the parties which does not require the signatures of all parties. But I am stuck with the below error. Please help.

FlowLogicRef cannot be constructed for FlowLogic of type net.corda.yo.YoFlow as could not find matching constructor for: {target=null}

This is my code: https://github.com/ToniyaSundaram/CordaProjects.

Answer 1

There might be a bug in your API endpoint code.

In your code, you are setting:

val acceptors : ArrayList<Party>? = null;

And then in the subsequent loop, you have the following logic for expanding the array:

if (acceptors != null) {
    acceptors.add(to)
}

Since acceptors is initialised to null, this condition is never true and you never expand the list. As a result, when you try to construct the YoFlow, you are trying to set the target parameter to null, which isn't allowed due to Kotlin's null safety.

Try this instead:

val acceptors = mutableListOf<Party>()