@Test
public void test_replace_collection_with_bidirectional_relation() {
em.getTransaction().begin();
Department d = em.find(Department.class, 1L);
final ArrayList<Employee> employees = new ArrayList<Employee>();
d.addEmployee(new Employee("Sjaak de Vries", d));
d.addEmployee(new Employee("Henk de Mol", d));
d.setEmployees(employees);
em.flush();
em.getTransaction().commit();
}
private void setupBidirectional() {
Department department = new Department("Java");
department.addEmployee(new Employee("Jakab Gipsz", department));
department.addEmployee(new Employee("Captain Nemo", department));
em.persist(department);
}