NullPointerException while Inserting New Entity in EJB 3.0

Question

Hi
I have created an entity with Three underlying database tables using "SecondaryTables" annotation. I have set "insertable" property to "false" on the columns derived from secondary tables. While persisting a new entity using "EntityManager.persist(newEntity)"
I am getting a NullPointerException.(See Stack trace below).
Please let me know how to over come this error.
More Info:
If I change "insertable" property to true. It persists the new entity in all underlying tables without any error.
java.lang.NullPointerException
at oracle.toplink.internal.descriptors.ObjectBuilder.addPrimaryKeyForNonDefaultTable(ObjectBuilder.java:97)
at oracle.toplink.internal.descriptors.ObjectBuilder.buildRowForTranslation(ObjectBuilder.java:607)
at oracle.toplink.queryframework.WriteObjectQuery.prepareForExecution(WriteObjectQuery.java:142)
at oracle.toplink.queryframework.DatabaseQuery.execute(DatabaseQuery.java:492)
at oracle.toplink.publicinterface.Session.internalExecuteQuery(Session.java:1968)
at oracle.toplink.publicinterface.UnitOfWork.internalExecuteQuery(UnitOfWork.java:2222)
at oracle.toplink.publicinterface.Session.executeQuery(Session.java:1096)
at oracle.toplink.publicinterface.Session.executeQuery(Session.java:1048)
at oracle.toplink.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:177)
at oracle.toplink.publicinterface.Session.writeAllObjectsWithChangeSet(Session.java:3233)
at oracle.toplink.publicinterface.UnitOfWork.commitToDatabase(UnitOfWork.java:1061)
at oracle.toplink.publicinterface.UnitOfWork.commitToDatabaseWithChangeSet(UnitOfWork.java:1106)
at oracle.toplink.publicinterface.UnitOfWork.commitRootUnitOfWork(UnitOfWork.java:927)
at oracle.toplink.publicinterface.UnitOfWork.commit(UnitOfWork.java:743)

Answer 1

My model is based on three database tables for which I have defined the following entity bean.
@Entity
@Table(name="S_ORD")
@SecondaryTables({
@SecondaryTable(name="S_CUSTOMER",join={@JoinColumn(name="ID", referencedColumnName="CUSTOMER_ID")}),
@SecondaryTable(name="S_EMP",join={@JoinColumn(name="ID", referencedColumnName="SALES_REP_ID")})
public class SOrd implements Serializable {
     private BigDecimal id;
     private Timestamp dateOrdered;
     private Timestamp dateShipped;
     private BigDecimal total;
     private String paymentType;
     private String orderFilled;
     private BigDecimal customerId;
     private String customerName;
     private BigDecimal salesRepId;
     private String salesRepName;
I have added column annotations on getter methods of these fields.
For Ex:
     @Id(generate=GeneratorType.SEQUENCE, generator="S_ORD_ID")
     @Column(name="ID",primaryKey=true)
     public BigDecimal getId() {
          return id;
     @Column (name="DATE_ORDERED")
     public Timestamp getDateOrdered() {
          return dateOrdered;
and so on.
The fields in bold and underlined are derived from secondary tables and their annotations are as below and which are causing the NullPointerException.
     @Column(name="ID",secondaryTable="S_CUSTOMER", insertable=false,updatable=false)
     public BigDecimal getCustomerId() {
          return customerId;
     @Column (name="ID",secondaryTable="S_EMP",insertable=false,updatable=false)
     public BigDecimal getSalesRepId() {
          return salesRepId;
     @Column(name="NAME",secondaryTable="S_CUSTOMER",insertable=false,updatable=false)
     public String getCustomerName() {
          return customerName;
     @Column(name="LAST_NAME", secondaryTable="S_EMP",insertable=false,updatable=false)
     public String getSalesRepName() {
          return salesRepName;
If I make these columns from secondary tables "insertable=true,updatable=true" then, EntityManager.persist(obj); will insert rows into all three tables.
I need to prevent inserting rows into secondary tables.
Thank you for helping me out.
Vikrant.