Java JPA2.1在Hibernate中命名子图忽略子类

我使用的是Hibernate 4.3.8.FINAL，并且有以下模型，其中一个部门有很多员工，一个员工可以是经理

雇员实体：

@Entity
@Table(name = "employee", schema = "payroll")
@Inheritance(strategy = InheritanceType.JOINED)
public class Employee
{
    @Id
    private Long id;

    @Basic(optional = false)
    @Column(name = "name")
    private String name;

    @JoinColumn(name = "department_id", referencedColumnName = "id")
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private Department department;
}

管理人实体：

@Entity
@Table(name = "manager", schema = "payroll")
@Inheritance(strategy = InheritanceType.JOINED)
@PrimaryKeyJoinColumn(name = "employee_id", referencedColumnName = "id")
public class Manager extends Employee
{
    @Basic(optional = false)
    @Column(name = "car_allowance")
    private boolean carAllowance;
}

新闻部实体：

@NamedEntityGraph(
        name = "Graph.Department.FetchManagers",
        includeAllAttributes = false,
        attributeNodes = {
                @NamedAttributeNode(value = "name"),
                @NamedAttributeNode(value = "employees", subgraph = "FetchManagers.Subgraph.Managers")
        },
        subgraphs = {
                @NamedSubgraph(
                        name = "FetchManagers.Subgraph.Managers",
                        type = Employee.class,
                        attributeNodes = {
                                @NamedAttributeNode(value = "name")
                        }
                ),
                @NamedSubgraph(
                        name = "FetchManagers.Subgraph.Managers",
                        type = Manager.class,
                        attributeNodes = {
                                @NamedAttributeNode(value = "carAllowance"),
                        }
                )
        }
)
@Entity
@Table(name = "department", schema = "payroll")
public class Department
{

    @Id
    private Long id;

    @Basic(optional = false)
    @Column(name = "name")
    private String name;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "department", fetch = FetchType.LAZY)
    private Set<Employee> employees;
}

---

根据我的理解，@NamedSubgraph.type应该用于指定要获取的实体子类属性。是否可能Hibernate忽略了@NamedSubgraph注释的type=Manager.class属性，或者我遗漏了什么？

这可能是Hibernate 4.3.8.FINAL的缺陷，例如，EclipseLink 2.5.1在使用

子图时不会引发异常

无论如何，如果是
管理器
类型，则在指定
子类子图
而不是
子类
时，它应该可以工作，即：

@NamedEntityGraph(
name=“Graph.Department.FetchManagers”，
includeAllAttributes=false，
属性节点={
@NamedAttributeNode（value=“name”），
@NamedAttributeNode（value=“employees”，subgraph=“FetchManagers.subgraph.Managers”）
},
子图={
@命名子图(
name=“FetchManagers.Subgraph.Managers”，
类型=Employee.class，
属性节点={
@NamedAttributeNode（value=“name”）
}
)
},
子类子图={
@命名子图(
name=“FetchManagers.Subgraph.Managers”，
type=Manager.class，
属性节点={
@NamedAttributeNode（value=“carAllowance”），
}
)
}
)
我在另一个问题中遇到了嵌套子图的另一个问题。如果你也能看一看，我将不胜感激。
Unable to locate Attribute  with the the given name [carAllowance] on this ManagedType [com.nemea.hydra.model.test.Employee]