Using Wiremock 2.x from Scala

I am trying to use Wiremock 2.1.6 from Scala. However, something has changed in the types of the mapping builders, so that scalac cannot typecheck it anymore.

The first stubbing example in the documentation:

stubFor(get(urlEqualTo("/some/thing"))
        .willReturn(aResponse()
            .withHeader("Content-Type", "text/plain")
            .withBody("Hello world!")));

results in this error when compiling:

type mismatch;
    found   : ?0(in value <local TestSpec>) where type ?0(in value <local TestSpec>) <: AnyRef
    required: com.github.tomakehurst.wiremock.client.RemoteMappingBuilder[_ <: AnyRef, _ <: com.github.tomakehurst.wiremock.client.ScenarioMappingBuilder]
    get(urlEqualTo("some/thing")).willReturn(

The method willReturn is defined in the RemoteMappingBuilder interface

public interface RemoteMappingBuilder<M extends RemoteMappingBuilder, S extends ScenarioMappingBuilder> {
    ...
    M willReturn(ResponseDefinitionBuilder responseDefBuilder);
}

It seems to me that Scala is not happy about the generic interface RemoteMappingBuilder being used without type parameters in M extends RemoteMappingBuilder.

Any suggestions on how to work around this?

(I also posted this on SO: http://stackoverflow.com/questions/38301631/wiremock-2-x-in-scala)

[tomakehurst]

We’re working on a fix but it’s taking a while. Maintaining some semblance of backwards compatibility is going to be hard.

Breaking Scala certainly wasn’t intentional. I’m not a Scala expert and hadn’t appreciated that its generics system will reject code that javac had no problem with.

[mriehl]

Cool, thanks. That’s also the first time I come across something like this 😕