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From Rick Curtis <curti...@gmail.com>
Subject Re: "element" column of the associated table is null
Date Wed, 25 Apr 2012 13:49:22 GMT
What version of OpenJPA are you using and how are you enhancing your
entities?

Also, is there are particular reason that you have the @ManagedInterface
annotation on your IInterface interface? Unless you plan on using some of
the documented managed interface[1] support, *I think* you can safely
remove that.

Thanks,
Rick

[1]
http://openjpa.apache.org/builds/latest/docs/docbook/manual.html#ref_guide_pc_interfaces

On Wed, Apr 25, 2012 at 5:20 AM, CarpathianAnonymous <
andreibratu2004@yahoo.com> wrote:

> I have an Interface (IInterface) and 2 classes that implements that
> interface
> (IInterface). Also in another class ( Holder ) I have a collection of
> interface items ( Collection<IInterface> ).
>
> When I try to execute the code from OpenJPA_Test.main, in my associated
> table ( holder_classes), the column which is supposed to hold the
> references
> to Class1 or Class2 objects are NULL.
>
> public class OpenJPA_Test {
>
>    private static HolderDao holderDao =
> EntityDaoFactory.inst().getHolderDao();
>
>    /**
>     * @param args the command line arguments
>     */
>    public static void main(String[] args) {
>        // TODO code application logic here
>        Holder h = new Holder();
>        LinkedList<IInterface> list = new LinkedList<IInterface>();
>
>        Class1 c1 = new Class1();
>        Class2 c2 = new Class2();
>
>        list.add(c1);
>        list.add(c2);
>
>        h.setClasses(list);
>        holderDao.create(h);
>
>    }
> }
>
>
> @ManagedInterface
> public interface IInterface {
>    @Id
>    @GeneratedValue(strategy = GenerationType.IDENTITY)
>    int getId();
>    void setId(int id);
> }
>
>
> @Entity
> @Table(name = "class1")
> public class Class1 implements IInterface {
>
>    @Id
>    private int id;
>    @Basic
>    private int number;
>
>    public Class1() {
>    }
>
>    @Override
>    public int getId() {
>        return id;
>    }
>
>    @Override
>    public void setId(int id) {
>        this.id = id;
>    }
>
>    public int getNumber() {
>        return number;
>    }
>
>    public void setNumber(int number) {
>        this.number = number;
>    }
> }
>
>
>
> @Entity
> @Table(name = "class2")
> public class Class2 implements IInterface {
>
>    @Id
>    private int id;
>    @Basic
>    private String text;
>
>    public Class2(){
>    }
>
>    public String getText() {
>        return text;
>    }
>
>    public void setText(String text) {
>        this.text = text;
>    }
>
>    public int getId() {
>        return id;
>    }
>
>    public void setId(int id) {
>        this.id = id;
>    }
> }
>
>
>
> @Entity
> @Table(name = "holder")
> public class Holder {
>
>    @Id
>    @GeneratedValue(strategy = GenerationType.IDENTITY)
>    private int id;
>    @OneToMany(cascade = CascadeType.ALL)
>    private Collection<IInterface> classes;
>
>    public Holder(){
>    }
>
>    public Collection<IInterface> getClasses() {
>        return classes;
>    }
>
>    public void setClasses(Collection<IInterface> classes) {
>        this.classes = classes;
>    }
>
>    public int getId() {
>        return id;
>    }
>
>    public void setId(int id) {
>        this.id = id;
>    }
> }
>

-- 
*Rick Curtis*

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