我有3個實體命名,紀律,DisciplineMembership,DisciplineManagement:休眠LazyInitializing悖論
一個紀律有很多DisciplineMemberships
一個紀律有很多DisciplineManagements
一個DisciplineManagem耳鼻喉科有一個與DisciplineMembership
紀委相關HBM文件的相關部分一對一的關係是這樣的:
Discipline.hbm:
<class name="Discipline" table="DISCIPLINES">
<id name="id" type="java.lang.Long">
<generator class="increment" />
</id>
<set name="memberships" inverse="false" cascade="all-delete-orphan" >
<key column="disciplineId" not-null="true" />
<one-to-many class="DisciplineMembership" />
</set>
<set name="managements" inverse="false" cascade="all-delete-orphan">
<key column="disciplineId" not-null="true" />
<one-to-many class="DisciplineManagement" />
</set>
</class>
在一個名爲功能A,我想遍歷DisciplineMemberships和DisciplineManagements of a Discipline:
public void A(){
Discipline discipline = this.getObject();
for(DisciplineMembership mem: discipline.getMembers()){
System.out.print(mem);
}
for(DisciplineManagement man: discipline.getManagements()){
System.out.print(man);
}
}
第一爲語句運行正常,但在第二個,我趕上LazyInitializationException異常如下:
13-04-27 13:54:26,115 [hibernate.LazyInitializationException (<init>:42)] ERROR: failed to lazily initialize a collection of role: Discipline.managements, no session or session was closed
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: Discipline.managements, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:368)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:111)
at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:186)
at ObjectManagementPart_Edit.A(ObjectManagementPart_Edit.java:6)
我很困惑如何可能呢?紀律會議是開放的,我可以迭代其成員資格,但是當我想通過其管理迭代時,hibernate不能懶惰初始化它們。
我該怎麼辦?
更新: 我試圖用狀態,Hibernate.initialize()函數,所以函數A現在是這樣的:
public void A(){
Discipline discipline = this.getObject();
Hibernate.initialize(discipline.getMembeships());
for(DisciplineMembership mem: discipline.getMemberships()){
System.out.print(mem);
}
Hibernate.initialize(discipline.getManagements());
for(DisciplineManagement man: discipline.getManagements()){
System.out.print(man);
}
}
爲Membeships第一使用狀態,Hibernate.initialize()的具有沒問題,但 在管理層秒使用我得到這個異常:
org.hibernate.HibernateException: collection is not associated with any session
at org.hibernate.collection.AbstractPersistentCollection.forceInitialization(AbstractPersistentCollection.java:474)
at org.hibernate.Hibernate.initialize(Hibernate.java:431)
at discipline.ObjectManagementPart_Edit.A(ObjectManagementPart_Edit.java:6)
現在我更困惑了:/
你應該怎麼做?不要懶惰,渴望。 – 2013-04-27 10:17:13
編號:D 我不想清除問題, – Ehsan 2013-04-27 10:19:41
我有一個想法,如果你把一些註釋或標誌不去集合或只是返回空集合,所以你不需要自然地初始化它當你穿過樹。 – 2013-04-27 10:24:20