A RestClientDefinitionException is thrown when adding java.io.Closeable to the REST service interface:

org.eclipse.microprofile.rest.client.RestClientDefinitionException: Parameters and variables don't match on interface MyClass$MyInterface::close

The interface is:

public interface MyInterface extends Closeable {
  @javax.ws.rs.GET
  @javax.ws.rs.Path("{endPoint}")
  Response getResponse(@PathParam("endPoint") String path, @QueryParam("id") String id);
}

It works with RestEasy v4.5.8!

After investigating the differences I was able to tackle it down to this line:

https://github.com/resteasy/Resteasy/blob/3.14.0.Final/resteasy-client-microprofile/src/main/java/org/jboss/resteasy/microprofile/client/RestClientBuilderImpl.java#L408

respectively:

https://github.com/resteasy/Resteasy/blob/3.14.0.Final/resteasy-jaxrs/src/main/java/org/jboss/resteasy/specimpl/ResteasyUriBuilder.java#L137

Somehow the template does not get changed. It stuck with the PathParam instead of "foobar" and ultimately LOC#403 if (allVariables.size() != paramMap.size()) fails.

Possible fix for L408:

template = template.resolveTemplates(paramMap, false).build();