问解析模板"/index.html“时出错，模板可能不存在或任何已配置的模板解析程序都无法访问该模板

EN

@Entity
@Table(name="applicant")
public class FormModel {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
    private String name;
    @Email
    private String email;
    @Size(min=2, max=200)
    private String description;

    public String getName() {
        return name;
    }

    @Required
    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    @Required
    public void setEmail(String email) {
        this.email = email;
    }

    public String getDescription() {
        return description;
    }

    @Required
    public void setDescription(String description) {
        this.description = description;
    }
}

@RestController
public class Home {

    @RequestMapping(value = "/", method = {RequestMethod.GET, RequestMethod.POST} )
    public ModelAndView index(){

        ModelAndView modelAndView = new ModelAndView("/index.html");

        return modelAndView;
    }

}