Cannot update a Sub Entiy InheritanceType.JOINED and when specify and @IdClass

I am using the version 5.2.17.Final of Hibernate.

I have an entity Employee that extends the entity Person (below the two entities). When I try to update an instance of employee , the exception "Duplicate entry 'Test' for key 'PRIMARY' " is thrown.
When I remove the annotation @IdClass(value = PersonId.class) from the Entity Person, the update works fine.

When i debugged in hibernate, the entity Employee is always considered as transient when merging the object.

Can you please tell me why when I add @IdClass i cannot update a sub entity and the system will always try to invoke the insert ?

@Entity
@IdClass(value = PersonId.class)
@Inheritance(strategy = InheritanceType.JOINED)
@Table(name = "persons")
@Access(value = AccessType.FIELD)
public class Person {

public Person() {
}

@javax.persistence.Column(name = "name", unique = false, nullable = false, insertable = true, updatable = false, length = 255)
@Id
@Basic(fetch = FetchType.EAGER, optional = false)
private String name;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
}


@Entity
@Table(name = "employees")
@Inheritance(strategy = InheritanceType.JOINED)
@Access(value = AccessType.FIELD)
public class Employee extends Person {

private String idEmployee ;


public String getIdEmployee() {
return idEmployee;
}

public void setIdEmployee(String idEmployee) {
this.idEmployee = idEmployee;
}
}


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