Jpa ManyToMany Problem

XXyz · **Joined:** Sat Jan 24, 2009 4:48 pm **Posts:** 2

Hi
I am using jpa with seam. I want to add relations on database tables.
I have two entities: Project and Employee. When I use @ManyToOne this code is working well:

Code:

@Entity
public class Employee implements Serializable
{
    // seam-gen attributes (you should probably edit these)
    private Long id;
    private Integer version;
    private String name;
    private String code;
    private Project project;

    @Id @GeneratedValue
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    .........
    .........
    @ManyToOne
    public Fakulte getProject() {
      return project;
     }

     public void setFakulte(Project project) {
      this.project = project;
     }
}

And I get the project like this:

Code:

<h:selectOneMenu value="#{employeeHome.instance.project}">
                   <s:selectItems var="project" value="#{projectList.resultList}" label="#{project.name}"></s:selectItems>
                  <s:convertEntity></s:convertEntity>
                </h:selectOneMenu>

But when I want to do a manytomany relation, this doesn't work. Then I have to change the project variable type to List. This works but doesn't insert record to newly created relational project_employee table. Is there a problem in h:selectOneMenu? What might be the problem?

XXyz · **Joined:** Sat Jan 24, 2009 4:48 pm **Posts:** 2

i am still waiting. i need solution. pls help

Anacron · **Posted:** Sun Jan 25, 2009 5:00 pm

Hi,
using manytomany impies the property is a collection. List is a good choice.

The selectOneMenu, as the word tell you, permit to select only one bean, so it is not a good choice.

I think you can try on SeamFramework forums.