我有擴展其他泛型類的泛型類。他們全部是@MappedSuperclass
。所以他們在數據庫中沒有自己的表格。它們也是抽象的,所以它們沒有任何物體。他們只是骷髏對我的實體@Entity
將泛型類@MappedSuperclass應用爲targetEntity.Error:@ManyToOne on models.Unit.parent引用未知實體:models.GenericHierarchic
我的繼承結構:
Generic -> GenericDictionary -> GenericHierarchicalDictionary -> Unit
如果單位是@Entity
級別且對象。
@Entity
public class Unit extends GenericHierarchicalDictionary<Unit> {}
單位實體有層次結構這意味着實體關係到自身,但我使用的是抽象類(@MappedSuperclass
),所以我想在抽象類動態定義它:
My GenericHierarchicalDictionary:
@MappedSuperclass
public abstract class GenericHierarchicalDictionary<T extends Generic<T>> extends GenericDictionary<T> {
@Required
@ManyToOne(targetEntity = GenericHierarchicalDictionary.class, fetch=FetchType.LAZY, cascade = {CascadeType.ALL})
@JoinColumn(name="parent_id")
public GenericHierarchicalDictionary<T> parent;
但是id dosnt工作。我得到一個錯誤:
play.api.UnexpectedException: Unexpected exception[PersistenceException: [PersistenceUnit: defaultPersistenceUnit] Unable to configure EntityManagerFactory]
at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(ApplicationProvider.scala:148) ~[play_2.10.jar:2.2.4]
at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(ApplicationProvider.scala:112) ~[play_2.10.jar:2.2.4]
at scala.Option.map(Option.scala:145) ~[scala-library.jar:na]
at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1.apply(ApplicationProvider.scala:112) ~[play_2.10.jar:2.2.4]
at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1.apply(ApplicationProvider.scala:110) ~[play_2.10.jar:2.2.4]
at scala.util.Success.flatMap(Try.scala:200) ~[scala-library.jar:na]
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: defaultPersistenceUnit] Unable to configure EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:378) ~[hibernate-entitymanager-3.6.9.Final.jar:3.6.9.Final]
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56) ~[hibernate-entitymanager-3.6.9.Final.jar:3.6.9.Final]
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63) ~[hibernate-jpa-2.0-api.jar:1.0.1.Final]
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47) ~[hibernate-jpa-2.0-api.jar:1.0.1.Final]
at play.db.jpa.JPAPlugin.onStart(JPAPlugin.java:35) ~[play-java-jpa_2.10.jar:2.2.4]
at play.api.Play$$anonfun$start$1$$anonfun$apply$mcV$sp$1.apply(Play.scala:88) ~[play_2.10.jar:2.2.4]
Caused by: org.hibernate.AnnotationException: @OneToOne or @ManyToOne on models.Unit.parent references an unknown entity: models.GenericHierarchicalDictionary
at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:107) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
at org.hibernate.cfg.Configuration.processEndOfQueue(Configuration.java:1580) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
at org.hibernate.cfg.Configuration.processFkSecondPassInOrder(Configuration.java:1503) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1419) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1375) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final]
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1519) ~[hibernate-entitymanager-3.6.9.Final.jar:3.6.9.Final]
如果我得到正確的錯誤,我應該分配給targetEntity一個Java類@Entity
註解,但它不是我想有什麼。
我想從實體的上下文中動態聲明@ManyToOne targetEntity。
我該如何實現這一目標?請給我一些幫助。
我會檢查它,但現在我切換到春天了,它就可以工作在箱子外面:d。但謝謝你的回答。 – masterdany88 2015-03-25 14:16:27
噢,好的。你能不能讓我知道春天它是如何開箱的?我正在使用春天,但是我按照上面提到的方式進行了操作。 – fretswitch 2015-03-26 15:35:24
檢查我的答案。希望我幫忙; D – masterdany88 2015-03-26 19:22:53