private static boolean isSerializable(@NotNull UClass aClass, @Nullable RefClass refClass, @NotNull String fqn) {
    PsiClass psiClass = aClass.getJavaPsi();
    Project project = psiClass.getProject();
    PsiClass serializableClass = DumbService.getInstance(project).computeWithAlternativeResolveEnabled(
      () -> JavaPsiFacade.getInstance(project).findClass(fqn, psiClass.getResolveScope()));
    return serializableClass != null && isSerializable(aClass, refClass, serializableClass);
  }
private static boolean isSerializable(@NotNull UClass aClass, @Nullable RefClass refClass, @NotNull String fqn)