public static PsiMethod findObservablePropertyGetter(@NotNull PsiClass psiClass, @Nullable String propertyName) {
    if (StringUtil.isEmpty(propertyName)) return null;
    final PsiMethod[] getters = psiClass.findMethodsByName(propertyName + JavaFxCommonNames.PROPERTY_METHOD_SUFFIX, true);
    for (PsiMethod getter : getters) {
      if (getter.hasModifierProperty(PsiModifier.PUBLIC) &&
          !getter.hasModifierProperty(PsiModifier.STATIC) &&
          getter.getParameterList().isEmpty() &&
          InheritanceUtil.isInheritor(getter.getReturnType(), JavaFxCommonNames.JAVAFX_BEANS_VALUE_OBSERVABLE_VALUE)) {
        return getter;
      }
    }
    return null;
  }
public static PsiMethod findObservablePropertyGetter(@NotNull PsiClass psiClass, @Nullable String propertyName)