Question: I tried to understand it by myself using the [doc](https://docs.scipy.org/doc/scipy-0.19.1/reference/index.html) , but I don't get why, from the module `scipy`, I can import `linspace` which is a function of the module `numpy`. They both work well. 
Also, I can't find it in the `scipy` doc.

Answer: 
**Unable to find setter method for attribute: [commandName]t** 

In this exception Spring Container want to know that, the name you used as "commandName" or "modelAttribute" in jsp form tag, that attribute belong to which Domain(Class).? that means the `commandName="customer"` the customer is instanceOf Customer model class .? or it is instanceof other..? so that to ensure the Spring Container you have to send Model to view in your HomeController of welcomePage() method just do that as follows.

```
import org.springframework.ui.Model;
@Controller
public class HomeController {

    @RequestMapping("/")
    public String welcomePage(Model model)
    {
        /* i am not sure what would be youe Model name for customer change that accord to your model name */
        Customer customerInstance = new Customer();
        model.addAttribute("customer", customerInstance);
        return "home";
    }
}

```

Уou can se there i added 2 parameter in Model attribute 

1. Attribute Name i.e customer
2. Object name i.e customerInstance

The Model is an Interface which is a part of Spring API Library, **The Model interface**
Simply put, the model can supply attributes used for rendering views.  

To provide a view with usable data, we simply add this data to its Model object. Additionally, maps with attributes can be merged with Model instances:
[If you want to know more go to this link](http://www.baeldung.com/spring-mvc-model-model-map-model-view)
This can be resolved by changing 'commandName' with 'modelAttribute' in the form.
With Spring 5 jars , commandName parameter is not working.

Please visit below link for more details on changes present in Spring framework 5:

<https://github.com/spring-projects/spring-framework/wiki/Upgrading-to-Spring-Framework-5.x>