@Path("/test")
public class TestResource {

    @Inject
    FooResource fooResource;

    @Path("lookup")
    public FooResource lookup() {
        return fooResource;
    }

    @ApplicationScoped // Weld uses a proxy
    public static class FooResource {

        @GET
        public String get(@QueryParam("foo") List<Foo> foos) {
            // Bug: It's not a List<Foo>, it's a List<String>
            for (Foo foo : foos) {
                return "OK";
            }
            return null;
        }

    }
    public static class Foo {
        String value;

        public Foo(String value) {
            this.value = value;
        }
    }
}