Using Generics in QueryHandler response error

Imported from Google Groups
1

Hello,

We are having issues when our QueryHandler is returning a Class with a Generic parameter (like QueryResult). Axon is giving us the following message:

NoHandlerForQueryException: No handler found for [xxxQuery] with response type [InstanceResponseType{class QueryResult}]

Is using Generics allowed in QueryHandlers or do we have to call queryGateway in some specific way?

Regards,

Rob

2

Hi Rob,

we currently don’t support generics yet. The only place where we do support them is when returning a List or Future.

You could implement your own “ResponseType” by implementing the org.axonframework.messaging.responsetypes.ResponseType interface. Make sure both sender and recipient have the class, though.

Cheers,