in cxx/fbjni/detail/Hybrid.h [279:290]
inline JField<detail::HybridData::javaobject> detectHybrid(alias_ref<jclass> jclass) {
bool isHybrid = detail::HybridClassBase::isHybridClassBase(jclass);
if (isHybrid) {
return JField<detail::HybridData::javaobject>(nullptr);
} else {
auto result = HybridClass<T, B>::JavaPart::javaClassStatic()->template getField<detail::HybridData::javaobject>("mHybridData");
if (!result) {
throwNPE();
}
return result;
}
}