BeanUtils getPropertyOfMapBean

Question

I'm wondering if it is possible to get data from property which is map containing pairs Key-StringArray (Map) in BeanUtils library. I just simply need to access one of array elements by calling propertyName=string[0]. Current version (1.8.3) does not support indexed properties. If you look into their code you will find in class PropertyUtilsBean in method getPropertyOfMapBean:

if (resolver.isIndexed(propertyName) || resolver.isMapped(propertyName)) {
      throw new IllegalArgumentException(
     "Indexed or mapped properties are not supported on"
     + " objects of type Map: " + propertyName);
}

way too bad:-( Have any of you any tip how to do it somehow differently?