Program: 68595
Project: 68595
Buggy source:
/** 
 * Create/populate database.
 */
public void setup(){
  for (int j=0; j < 100; j++) {
    Employee empInsert=new Employee();
    empInsert.setFirstName("String_Node_Str");
    empInsert.setMale();
    empInsert.setLastName("String_Node_Str" + j + "String_Node_Str");
    empInsert.setSalary(100000);
    EmploymentPeriod employmentPeriod=new EmploymentPeriod();
    java.sql.Date startDate=Helper.dateFromString("String_Node_Str");
    java.sql.Date endDate=Helper.dateFromString("String_Node_Str");
    employmentPeriod.setEndDate(startDate);
    employmentPeriod.setStartDate(endDate);
    empInsert.setPeriod(employmentPeriod);
    empInsert.setAddress(new Address());
    empInsert.getAddress().setCity("String_Node_Str");
    empInsert.getAddress().setPostalCode("String_Node_Str");
    empInsert.getAddress().setProvince("String_Node_Str");
    empInsert.getAddress().setStreet("String_Node_Str" + j);
    empInsert.getAddress().setCountry("String_Node_Str");
    empInsert.addPhoneNumber(new PhoneNumber("String_Node_Str","String_Node_Str","String_Node_Str"));
    empInsert.addPhoneNumber(new PhoneNumber("String_Node_Str","String_Node_Str","String_Node_Str"));
    getDatabaseSession().insertObject(empInsert);
  }
  setupProvider();
  getSession().logMessage(getExecutor().getEntityManagerFactory().getClass().toString());
  System.out.println(getExecutor().getEntityManagerFactory().getClass().toString());
}

Fixed version (ground truth):
/** 
 * Create/populate database.
 */
public void setup(){
  setupProvider();
  getSession().logMessage(getExecutor().getEntityManagerFactory().getClass().toString());
  System.out.println(getExecutor().getEntityManagerFactory().getClass().toString());
  EntityManager manager=getExecutor().createEntityManager();
  try {
    new EmployeeTableCreator().replaceTables(((JpaEntityManager)manager).getServerSession());
  }
 catch (  ClassCastException cast) {
    new EmployeeTableCreator().replaceTables(getDatabaseSession());
  }
  manager.getTransaction().begin();
  for (int j=0; j < 100; j++) {
    Employee empInsert=new Employee();
    empInsert.setFirstName("String_Node_Str");
    empInsert.setMale();
    empInsert.setLastName("String_Node_Str" + j + "String_Node_Str");
    empInsert.setSalary(100000);
    EmploymentPeriod employmentPeriod=new EmploymentPeriod();
    java.sql.Date startDate=Helper.dateFromString("String_Node_Str");
    java.sql.Date endDate=Helper.dateFromString("String_Node_Str");
    employmentPeriod.setEndDate(startDate);
    employmentPeriod.setStartDate(endDate);
    empInsert.setPeriod(employmentPeriod);
    empInsert.setAddress(new Address());
    empInsert.getAddress().setCity("String_Node_Str");
    empInsert.getAddress().setPostalCode("String_Node_Str");
    empInsert.getAddress().setProvince("String_Node_Str");
    empInsert.getAddress().setStreet("String_Node_Str" + j);
    empInsert.getAddress().setCountry("String_Node_Str");
    empInsert.addPhoneNumber(new PhoneNumber("String_Node_Str","String_Node_Str","String_Node_Str"));
    empInsert.addPhoneNumber(new PhoneNumber("String_Node_Str","String_Node_Str","String_Node_Str"));
    manager.persist(empInsert);
  }
  manager.getTransaction().commit();
  manager.close();
}