private @NotNull List<PsiClass> getPossiblyUnresolvedJavaNicknameUsages() {
    List<PsiClass> result = new ArrayList<>();
    Collection<PsiAnnotation> annotations = JavaAnnotationIndex.getInstance().getAnnotations(StringUtil.getShortName(
      Jsr305Support.TYPE_QUALIFIER_NICKNAME), myProject, GlobalSearchScope.allScope(myProject));
    for (PsiAnnotation annotation : annotations) {
      PsiElement context = annotation.getContext();
      if (context instanceof PsiModifierList && context.getContext() instanceof PsiClass ownerClass &&
          ownerClass.isAnnotationType() && Jsr305Support.isNullabilityNickName(ownerClass)) {
        result.add(ownerClass);
      }
    }
    return result;
  }
private @NotNull List<PsiClass> getPossiblyUnresolvedJavaNicknameUsages()