fmt.Errorf("invalid service port value %d for %q: %v", port.Port, port.Name, err))
		}
	}
	return errs
}

// Validate ensures that the service instance is well-defined
func (instance *ServiceInstance) Validate() error {
	var errs error
	if instance.Service == nil {
		errs = multierror.Append(errs, fmt.Errorf("missing service in the instance"))
	} else if err := instance.Service.Validate(); err != nil {

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@ThreadSafe
public abstract class ModelRegistrations {

    public static <T> Builder serviceInstance(ModelReference<T> modelReference, T instance) {
        return bridgedInstance(modelReference, instance)
            .hidden(true);
    }