How to auto-grow Spring @ModelAttribute command class with a List of interface objects

I'm trying to bind a command class that contains a List of objects that implement an interface in Spring (Boot 1.4.4.RELEASE).

• Command class

  @Data
  @AllArgsConstructor
  public class CarInternetContentEditFormCommand implements EditFormCommand {
  
      @Valid
      @NotEmpty
      @JsonDeserialize(contentAs = CarInternetContentForm.class)
      private List<EditForm> editForms;
  
      public CarInternetContentEditFormCommand() {
          this.editForms = new ArrayList<>();
      }
  
      public EditForm getEditForm() {
          if (this.editForms.isEmpty()) {
              return new CarInternetContentForm();
          }
          return this.editForms.get(0);
      }
  
      @Override
      public void setEditForm(EditForm form) {
          if (this.editForms.isEmpty()) {
              this.editForms = new ArrayList<>();
          }
          this.editForms.add(form);
      }
  }
  

• Error trace

org.springframework.beans.NullValueInNestedPathException: Invalid property 'editForms' of bean class [com.phistory.mvc.cms.command.CarInternetContentEditFormCommand]: Could not instantiate property type [com.phistory.mvc.cms.form.EditForm] to auto-grow nested property path; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.phistory.mvc.cms.form.EditForm]: Specified class is an interface

When the view renders, the editForms list in the command is empty, and in my view I try to bind element number 0, like so:

<@spring.formInput "CICEFC.editForms[0].link", "class=form-control", "text"/>

Therefore Spring tries to auto-grow the list and instantiate an EditCommand object, which is obviously an interface and it doesn't know how to.

Is there a way to tell Spring how to do this? I have tried registering a PropertyEditor for the command class but it never gets invoked.