Hibernate：使用实体图时的MultipleBagFetchException

Question

Hibernate版本4.3.5：

当我尝试急切地获取我定义为列表的两个关系时，我遇到了一些奇怪的行为。 使用普通查询加载实体非常好，但是一旦我尝试使用实体图， 我得到一个异常：MultipleBagFetchException：无法同时获取多个包

所以，我的问题是：为什么会发生这种情况，我该如何解决？

我的实体看起来像这样：

@Entity
@NamedEntityGraph(name = "Person.loadAll",
         attributeNodes = {
         @NamedAttributeNode(value = "managedPersons", subgraph = "personName"),
         @NamedAttributeNode(value = "incidents", subgraph = "incidentNumber")},
         subgraphs = {
               @NamedSubgraph(name = "personName",
                     attributeNodes = {
                     @NamedAttributeNode("name")
               }),
               @NamedSubgraph(name = "incidentNumber",
               attributeNodes = {
                     @NamedAttributeNode("number")
               })
})
public class Person {

   private long id;

   @ManyToOne
   @JoinColumn(name = "managerid")
   private Person manager;

   @OneToMany(mappedBy = "manager", fetch = FetchType.EAGER)
   @OrderBy("name ASC")
   private List<Person> managedPersons;

   @OneToMany(mappedBy = "caller", fetch = FetchType.EAGER)
   @OrderBy("number ASC")
   private List<Incident> incidents;

   //some more stuff...
}