java.lang.ClassCastException：org.hibernate.action.DelayedPostInsertIdentifier不能轉換爲java.lang.Long

used：hibernate 3.6.2，maven 2，postgres 9. 我有代碼必須工作，但它不。當我啓動功能測試，我得到了錯誤：java.lang.ClassCastException：org.hibernate.action.DelayedPostInsertIdentifier不能轉換爲java.lang.Long

java.lang.ClassCastException：org.hibernate.action.DelayedPostInsertIdentifier不能轉換爲java.lang.Long中

代碼是非標準的域模型：

實體：

@Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL) 
@Entity 
@Table(schema = "simulators", name = "mySimulator_card") 
public class MySimulatorCard { 

    @Id 
    @Column(name = "id") 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    private Long id; 

    @Column(name = "account_number", unique = true, nullable = false) 
    private String accountNumber;

等等

DAO：

public abstract class AbstractDao<E, PK extends Serializable> implements Dao<E, PK> { 

    private EntityManager entityManager; 

    public EntityManager getEntityManager() { 
     return entityManager; 
    } 

    @PersistenceContext(unitName = "MySimulator") 
    public void setEntityManager(EntityManager entityManager) { 
     this.entityManager = entityManager; 
    } 

    public abstract Class<E> getEntityClass(); 

    @Override 
    public void persist(E e) { 
     getEntityManager().persist(e); 
    } 

    @Override 
    public E merge(E e) { 
     return getEntityManager().merge(e); 
    } 

    @Override 
    public void refresh(E e) { 
     getEntityManager().refresh(e); //<-- some thing wroooong 
    } 

    @Override 
    public void delete(E e) { 
     getEntityManager().remove(e); 
    }

等等

而且根據表：

CREATE TABLE simulators.mySimulator_card 
(
    id bigserial NOT NULL, 
    account_number character varying(255) NOT NULL, 

etc... 

    CONSTRAINT mySimulator_card_pk PRIMARY KEY (id), 
    CONSTRAINT mySimulator_card_account_fk FOREIGN KEY (account_id) 
     REFERENCES simulators.mySimulator_account (id) MATCH SIMPLE 
     ON UPDATE NO ACTION ON DELETE NO ACTION, 
    CONSTRAINT mySimulator_card_currency_fk FOREIGN KEY (currency_id) 
     REFERENCES simulators.mySimulator_currency ("name") MATCH SIMPLE 
     ON UPDATE NO ACTION ON DELETE NO ACTION, 
    CONSTRAINT mySimulator_card_product_fk FOREIGN KEY (product_id) 
     REFERENCES simulators.mySimulator_product (id) MATCH SIMPLE 
     ON UPDATE NO ACTION ON DELETE NO ACTION, 
    CONSTRAINT mySimulator_account_account_number_uq UNIQUE (account_number), 
    CONSTRAINT mySimulator_card_san_uq UNIQUE (san) 
) 
WITH (
    OIDS=FALSE 
); 
ALTER TABLE simulators.mySimulator_card OWNER TO functional;

下面是堆棧跟蹤，直到我的代碼：

at org.hibernate.type.descriptor.java.LongTypeDescriptor.unwrap(LongTypeDescriptor.java:36) 
     at org.hibernate.type.descriptor.sql.BigIntTypeDescriptor$1.doBind(BigIntTypeDescriptor.java:52) 
     at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:91) 
     at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:282) 
     at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:277) 
     at org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:1873) 
     at org.hibernate.loader.Loader.bindParameterValues(Loader.java:1844) 
     at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1716) 
     at org.hibernate.loader.Loader.doQuery(Loader.java:801) 
     at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274) 
     at org.hibernate.loader.Loader.loadEntity(Loader.java:2037) 
     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:86) 
     at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:76) 
     at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3293) 
     at org.hibernate.event.def.DefaultRefreshEventListener.onRefresh(DefaultRefreshEventListener.java:151) 
     at org.hibernate.event.def.DefaultRefreshEventListener.onRefresh(DefaultRefreshEventListener.java:62) 
     at org.hibernate.impl.SessionImpl.fireRefresh(SessionImpl.java:1118) 
     at org.hibernate.impl.SessionImpl.refresh(SessionImpl.java:1098) 
     at org.hibernate.ejb.AbstractEntityManagerImpl.refresh(AbstractEntityManagerImpl.java:738) 
     at org.hibernate.ejb.AbstractEntityManagerImpl.refresh(AbstractEntityManagerImpl.java:713) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:601) 
     at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:365) 
     at $Proxy153.refresh(Unknown Source) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:601) 
     at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240) 
     at $Proxy82.refresh(Unknown Source) 
     at com.goooogle.simulator.mysimulator.dao.AbstractDao.refresh(AbstractDao.java:42)

爲什麼？它是休眠的錯誤？

來源

2012-03-07 Dmitrii Borovoi

您的驅動程序和方言在您的hibernate.properties文件中是否正確？

hibernate.connection.driver_class = org.postgresql.Driver

hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect

http://docs.jboss.org/hibernate/orm/3.6/reference/en-US/html_single/#configuration-hibernatejdbc

來源

2012-03-07 08:21:23

提供了方言，沒有提供driver_class。我添加行但它沒有幫助 – 2012-03-07 11:23:44

你沒有定義主鍵的IDENTITY你的創建表語句。

id bigserial NOT NULL IDENTITY

來源

2012-03-07 08:32:16

我不是postgres中的guru，但是在postgreSQL中沒有關鍵字標識，所以我無法使用你的例子。 – 2012-03-07 11:26:07

嘗試創建一個序列。 CREATE SEQUENCE sq; CREATE TABLE t_test（ id INTEGER PRIMARY KEY DEFAULT NEXTVAL（'sq'）， name VARCHAR（10））; INSERT INTO t_test（name） VALUES（'Andrew'）; INSERT INTO t_test（name） VALUES（'Gordon'）; SELECT * FROM t_test; – 2012-03-07 11:29:02

選中此項：http://sqlzoo.net/howto/source/z.dir/tip000001/postgres – 2012-03-07 11:30:13

我在執行save（）時遇到了完全相同的異常。我通過更正hibernate映射文件中的級聯選項來解決它。我把它從「全刪除孤立，保存更新，刪除」更改爲「保存更新，刪除，刪除孤兒」，它爲我工作。希望它有幫助。

來源

2012-07-12 14:24:32 poonam

java.lang.ClassCastException：org.hibernate.action.DelayedPostInsertIdentifier不能轉換爲java.lang.Long

回答

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