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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