public class Company {
	
	@OneToMany(mappedBy = "company")
	@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
	private List<User> users = new ArrayList<User>();

public class User {

	@ManyToOne(fetch = FetchType.LAZY)
	private Company company;

// Test case

// assume user has company set, company.getUsers().size() == 1
company.getUsers().get(0).setCompany(null); 
commit;
// company.getUsers().size() should equals to 0