JPA relationship JPAContainer with ComboBox?

Question

I\'m looking for a way to use a jpa relationship @OneToMany/@OneToOne/@ManyToOne/@ManyToMany with a ComboBox.

@Entity
public class State {

    @Id
    @Generat         


        

Answer 1

This question is related to another question on Stackoverflow: Vaadin 7.0.1 Combobox with JPAContainer and FieldGroup.

I wrote a blog post about this topic which explains how FieldGroups work internally and how you can make them work for this particular use case: Select Nested JavaBeans With a Vaadin FieldGroup. This post will also explain why a ConversionException is thrown in your example.

Of course you could switch to using a BeanItemContainer, but by using a simple Converter implementation you can use any Container implementation as data source for your ComboBox. See the blog post for details.