CODEWITHSUNDEEP
javascalagenerics
Mik378
Mik378

Reputation: 22171

Calling a Java method (dealing with generics) from Scala failed

I want to call this Java method (part of an API), from Scala (2.10.3): 

public <R> ConvertedResult<R> to(Class<R> type,
    ResultConverter<Map<String, Object>, R> converter)

ResultConverter interface being:

public interface ResultConverter<T, R> {
    R convert(T value, Class<R> type);
}

First, I created my converter (in Scala so):

class MyVOConverter extends ResultConverter[Map[String, AnyRef], MyVO] {

    def convert(queryResult: Map[String, AnyRef], 
                `type`: Class[MyVO]): MyVO = {
       //...
    }
}

providing a type and my MyVOConverter like this, when the call is made:

myResult.to(classOf[MyVO], new MyVOConverter())

However, Scala compiler warns about this:

Type mismatch, expected: ResultConverter[Map[String, AnyRef], NotInferedR],
actual: MyVOConverter

How to deal with this case?

Upvotes: 0

Views: 506

Answers (1)

Daniel C. Sobral
Daniel C. Sobral

Reputation: 297195

The Map on the interface is java.util.Map, but, assuming you haven't imported that, you are using scala.collection.immutable.Map and, therefore, incompatible.

Upvotes: 1

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