Generating value of column using sequence in Toplink

Question

Hi
I have a toplink pojo table, say SamplePojo. I need to automatically generate a value for the primary key field, say id. Is it possible to insert only the name field into the table and let toplink generate a value for id field using sequence?
I try the following code from my client class
Project project = XMLProjectReader.read("META-INF/tlMap.xml", Thread.currentThread().getContextClassLoader());
DatabaseSession session = project.createDatabaseSession();
session.shouldLogMessages();
session.login();
String query = "insert into SAMPLE_POJO(NAME) values('SAMPLE NAME')";               
session.executeSQL(query);
session.logout();If i execute the above code i get a error like "Internal Exception: java.sql.SQLException: ORA-01400: cannot insert NULL into ("MYSCHEMA"."SAMPLE_POJO"."ID")"
This is how my SamplePojo class looks like
@Entity
public class SamplePojo iimplements Serializablel {
    @Id
    @GeneratedValue(generator = "sampleSequence")
    @SequenceGenerator(name = "sampleSequence", sequenceName = "SAMP_SEQ", allocationSize = 1)
    private BigDecimal id;
    private String name;
    public SamplePojo(BigDecimal id, String name) {
        this.name = name;
        this.id = id;
//getters and setters for class variables
}

Answer 1

Are you trying to use JPA, or the native TopLink API?
Your annotations are JPA, but your code is the native API, using the XMLProjectReader.read("META-INF/tlMap.xml"), either use one or the other.
With JPA, you will just have a persistence.xml, and optionally an orm.xml (you will not use the Mapping Workbench).
To insert an object you just create an instance of the class and call persist(), no SQL.
i.e.
EntityManager em = factory.createEntityManager();
em.getTransaction().begin();
SamplePojo pojo = new SamplePojo();
pojo.setName("SAMPLE NAME");
em.persist(pojo);
em.getTransaction().commit();
James : http://www.eclipselink.org