自动生成表单问题vaadin有多对一字段---选择字段显示对象哈希码

Question

我尝试使用JPA容器自动生成表单。 对于多对一实体，它使用哈希码填充选择框，如图所示 -

是否可以显示映射实体的其他参数。

这些是我的实体

@Entity
@Table(name = "state")
public class State {
private String id;
private String name;
private Country country;
@ManyToOne(fetch = FetchType.LAZY)
 @JoinColumn(name = "country_id", nullable = false)
public Country getCountry() {
    return country;
}
public void setCountry(Country country) {
    this.country = country;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
@Id
public String getId() {
    return id;
}
public void setId(String id) {
    this.id = id;
}
}


@Entity
@Table(name="country")
public class Country {

private String id;
private String name;
private List<State> states;
@OneToMany(targetEntity=State.class, mappedBy="country", fetch=FetchType.EAGER)
public List<State> getStates() {
    return states;
}
public void setStates(List<State> states) {
    this.states = states;
}
@Id
public String getId() {
    return id;
}
public void setId(String id) {
    this.id = id;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
}

这是我的init方法 -

@Override
protected void init(VaadinRequest request) {
    setupEntityManager();
    FormLayout layout = new FormLayout();
    setContent(layout);
    final JPAContainer<State> states = JPAContainerFactory.make(State.class, "test1");
    final Form stateForm  = new Form();
    stateForm.setCaption("State Editor");
    stateForm.addStyleName("bordered"); // Custom style
    stateForm.setWidth("420px");
    stateForm.setBuffered(true);
    stateForm.setEnabled(false);
    final FieldFactory fieldFactory = new FieldFactory();
    stateForm.setFormFieldFactory(fieldFactory);
    stateForm.setItemDataSource(states.getItem("k"));
    stateForm.setEnabled(true);
    final Button save = new Button("Save");
    stateForm.getFooter().removeAllComponents();
    stateForm.getFooter().addComponent(save);
    layout.addComponent(stateForm);
    save.addListener(new Button.ClickListener() {
        @Override
        public void buttonClick(Button.ClickEvent event) {
            try {
                System.out.println("----------------commiting");
                stateForm.commit();
                stateForm.setEnabled(false);
            } catch (Validator.InvalidValueException e) {
            }
        }
    });