Using Nested Embeddable/Embedded annotation.

[KK]

Hi,

I have a scenario where class A contains object of class B and class B in
turn contains object of class C. According to JPA specs nesting of
embeddable tag is not supported (in OpenJPA). But I am trying the workaround
mentioned in section 2.4 of the following link:

http://en.wikibooks.org/wiki/Java_Persistence/Embeddables

I am not able to do it properly and getting the exception:

WARN   [main] openjpa.Enhance - [Possible violation of subclassing contract
detected while processing persistent field com.entity.B.data, declared in
E:\Workspace\JPA\bin\com\entity\B.class. Are you sure you are obeying the
OpenJPA requirements? Details: The getter for field data does not obey
OpenJPAs subclassing restrictions. Getters must return a single non-computed
field., Possible violation of subclassing contract detected while processing
persistent field com.entity.B.data, declared in
E:\Workspace\JPA\bin\com\entity\B.class. Are you sure you are obeying the
OpenJPA requirements? Details: The setter for field data does not obey
OpenJPAs subclassing restrictions. Setters must assign the passed-in
parameter to a single field in the object.]
 org.apache.openjpa.persistence.RollbackException: Missing field for
property "data" in type "class com.entity.B".

-------------------------------------------------------------
The code is hereunder:
CLASS A
@Entity(name="A")
public class A {
        private int id;
        private String name;
        private B b;
        @Id
        @GeneratedValue(strategy = GenerationType.AUTO)
        public int getId() {
                return id;
        }
        public void setId(int id) {
                this.id = id;
        }
        @Basic
        public String getName() {
                return name;
        }
        public void setName(String name) {
                this.name = name;
        }
        @Embedded
        public B getB() {
                return b;
        }
        public void setB(B b) {
                this.b = b;
        }
}
CLASS B
@Embeddable
public class B {
        
        private int age;
        private C c;
        
        @Basic
        public int getAge() {
                return age;
        }
        public void setAge(int age) {
                this.age = age;
        }
        @Embedded
        public C getC() {
                return c;
        }
        public void setC(C c) {
                this.c = c;
        }
        @Basic
        public int getData() {
                return getC().getData();
        }
        public void setData(int data) {
                getC().setData(data);
        }
}
CLASS C
@Embeddable
public class C {
        
        private int data;
        @Basic
        public int getData() {
                return data;
        }

        public void setData(int data) {
                this.data = data;
        }
}
TEST CLASS
public class AnnotationTest {
        private static EntityManagerFactory emf = null;
        public static void main(String[] args) {
                A a = new A();
                B b = new B();
                C c = new C();
                
                c.setData(1);
                b.setAge(21);
                b.setC(c);
                a.setName("Kamlesh");
                a.setB(b);
                
                EntityManager em = getEMF().createEntityManager();
                try {
                        em.getTransaction().begin();
                        em.persist(a);
                        em.getTransaction().commit();
                } catch (Exception e) {
                        e.printStackTrace();
                } finally {
                        em.close();
                }
        }
        public static EntityManagerFactory getEMF() {
                if (emf == null) {
                        emf = Persistence.createEntityManagerFactory("ibm");
                        System.out.println("emf " + emf);
                }
                return emf;
        }
}



I guess there is some problem with the way I am using Property access.
Please tell me what mistake I am doing.

Regards,
KK
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