Mapping using Java Coding

Question

I've got a big trouble. First, I'm trying to do mapping using Java Coding based on the TopLink Developer's Guide.
I'm using a Employee's Table as usual, but here is the problem, I can not do inserting on the database after I do mapping. As a note, there is no error compile and also I can do the session login already.
Employee.java
public class Employee extends oracle.toplink.sessions.Project{
     private Long id;
     private String fnama;
     private String lnama;
public Employee() {
setName("ObjectTab");
applyLogin();
addDescriptor(empDesc());
conformAllDescriptors();
public String getFnama() {
     return this.fnama;
public String getLnama() {
     return this.lnama;
public void setFnama(String fnama) {
     this.fnama = fnama;
public void setLnama(String lnama) {
     this.lnama = lnama;
public void applyLogin() {
DatabaseLogin login = new DatabaseLogin();
// use platform appropriate for underlying database
login.usePlatform(
new oracle.toplink.platform.database.oracle.Oracle9Platform());
login.setDriverClassName("oracle.jdbc.OracleDriver");
login.setConnectionString("jdbc:oracle:thin:localhost:1521:pusat");
login.setUserName("tryo");
login.setEncryptedPassword("a, ENCRYPTED");
// Configuration Properties
setDatasourceLogin(login);
public ClassDescriptor empDesc() {
ObjectRelationalDescriptor descriptor = new ObjectRelationalDescriptor();
descriptor.setJavaClass(Employee.class);
descriptor.setTableName("EMPLOYEES");
descriptor.setStructureName("EMPLOYEE_T");
descriptor.setPrimaryKeyFieldName("ID");
descriptor.addFieldOrdering("ID");
descriptor.addFieldOrdering("F_NAME");
descriptor.addFieldOrdering("L_NAME");
descriptor.addDirectMapping("id", "OBJECT_ID");
descriptor.addDirectMapping("fnama", "F_NAME");
descriptor.addDirectMapping("lnama", "L_NAME");
return descriptor;
Main Class:
protected String getSessionsXmlPath() {
return "sessions.xml";
protected String getSessionName() {
return "Session";
protected void createSession() {
XMLSessionConfigLoader loader = new XMLSessionConfigLoader(getSessionsXmlPath());
SessionManager mgr = SessionManager.getManager();
session = (DatabaseSession)mgr.getSession(loader, getSessionName(), Thread.currentThread().getContextClassLoader(), true, true);
public static void closeSession(){
SessionManager.getManager().destroyAllSessions();
session = null;
private void jButton1_actionPerformed(ActionEvent e) {
Employee myEmp = new Employee();
createSession();
private void jButton2_actionPerformed(ActionEvent e) {
Employee theEmp = new Employee();
UnitOfWork uow = session.acquireUnitOfWork();
try{
theEmp.setFnama("A");
theEmp.setLnama("B");
uow.commit();
}finally{
uow.release();
For everybody who already knows the solution, please reply as soon as possible. Because I really need this solution to finish my last final project.
Thanks

Answer 1

When you create a new instance you must register it with the UnitOfWork in order to have the new entity persisted.
Employee theEmp = new Employee();
UnitOfWork uow = session.acquireUnitOfWork();
theEmp.setFnama("A");
theEmp.setLnama("B");
uow.registerObject(theEmp);
uow.commit();
Doug