[jboss-user] [EJB 3.0] - a unidirectonal one-to many example, anyone can help me?
I wrote a example following the <mastringEJB4th>.
1.First,a company.java file:
@Entity
public class Company implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private String name;
private Set employees;
public Company() {
}
@OneToMany(cascade = CascadeType.PERSIST,
fetch=FetchType.EAGER,mappedBy="company")
public Set getEmployees() {
return employees;
}
public void setEmployees(Set employees) {
this.employees = employees;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
2.And then ,Employee.java:
@Entity()
public class Employee implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private String name;
private char sex;
public Employee() {
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public char getSex() {
return sex;
}
public void setSex(char sex) {
this.sex = sex;
}
}
3.I wrote a SLSB to test the example:
......
Company company = new Company();
Set employees = new HashSet();
Employee employee = new Employee();
employee.setName("jordan");
employee.setSex('M');
employees.add(employee);
employee = new Employee();
employee.setName("dennis");
employee.setSex('M');
employees.add(employee);
employee = new Employee();
employee.setName("catty");
employee.setSex('F');
employees.add(employee);
employee = new Employee();
employee.setName("inter");
employee.setSex('F');
employees.add(employee);
employee = new Employee();
employee.setName("James Gosling");
employee.setSex('M');
employees.add(employee);
company.setEmployees(employees);
em.persist(company);
}
public List getCompanies() {
Query query = em.createQuery("SELECT c FROM Company c");
return query.getResultList();
}
..........
but when I tried to deploy the example to the JBoss Server,it goes wrong:
Could not determine type for: java.util.Set, for columns:
[org.hibernate.mapping.Column(employees)]
I don't know why!!!Is my code have any problems?anyone can help me?thanks.
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