Hi,

I know that currently feign does support @QueryMap to solve dynamic query param values.

Our system is currently using JAXRS + resteasy for REST client framework. We are planning to migrate our framework to FEIGN without making many changes on the Rest Client Interface itself (which is still using JAXRS Annotation).

I know that FEIGN also supporting JAXRS Contract, but it is not 100% backward compatible when I try to migrate from RESTEASY to FEIGN.

One of the scenario that will fail is for such feature that is using below Path pattern :

    @GET
    @Path(value = "/countries?{queryParamList}")
    Country  getCountry(@PathParam("queryParamList") String queryParamList);

It resulted as null pointer exception for pattern above.

java.lang.NullPointerException
    at feign.RequestTemplate.replaceQueryValues(RequestTemplate.java:605)
    at feign.RequestTemplate.resolve(RequestTemplate.java:210)
    at feign.ReflectiveFeign$BuildTemplateByResolvingArgs.resolve(ReflectiveFeign.java:294)
    at feign.ReflectiveFeign$BuildTemplateByResolvingArgs.create(ReflectiveFeign.java:213)
    at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:72)

My really question is, Will FEIGN also support such pattern in the future ?

If yes, I can contribute my code change for pull request.

If no, Is the NullPointerException is expeted ?

Thanks.