GenericJDBCException：无法加载实体

Question

我试图读取一个延迟初始化实体ProductUnits这是一个持久集合，并为此打开一个新会话。

Session session = HibernateUtil.getSessionFactory().openSession(); 
session.update(stock.getProduct()); 
List<ProductUnits> units = new ArrayList<ProductUnits>(stock.getProduct().getUnits()); 

的问题是在它抛出异常

org.hibernate.exception.GenericJDBCException: could not load an entity: [hibernate.tables.plain.Product#1] 

运行时间，但同时做一个一步一步调试运行完全正常。是不是该session.update需要一些时间还是我失去了一些东西

异常堆栈是

Exception in thread "AWT-EventQueue-0" org.hibernate.exception.GenericJDBCException: could not load an entity: [hibernate.tables.plain.Product#2] 
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126) 
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114) 
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66) 
at org.hibernate.loader.Loader.loadEntity(Loader.java:1895) 
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:71) 
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:65) 
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3072) 
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:434) 
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:415) 
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:165) 
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:121) 
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:905) 
at org.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:863) 
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:95) 
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:140) 
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:190) 
at hibernate.tables.plain.Product_$$_javassist_15.getUnits(Product_$$_javassist_15.java) 
at bill.mainBill.InputProductsPanel.computeStockAvailablity(InputProductsPanel.java:278) 
at bill.mainBill.InputProductsPanel.findStock(InputProductsPanel.java:242) 
at bill.mainBill.ProductDetailPanel.setStats(ProductDetailPanel.java:315) 
at bill.mainBill.ProductDetailPanel$3.focusLost(ProductDetailPanel.java:187) 
at java.awt.AWTEventMulticaster.focusLost(Unknown Source) 
at java.awt.Component.processFocusEvent(Unknown Source) 
at java.awt.Component.processEvent(Unknown Source) 
at java.awt.Container.processEvent(Unknown Source) 
at java.awt.Component.dispatchEventImpl(Unknown Source) 
at java.awt.Container.dispatchEventImpl(Unknown Source) 
at java.awt.Component.dispatchEvent(Unknown Source) 
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source) 
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source) 
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source) 
at java.awt.Component.dispatchEventImpl(Unknown Source) 
at java.awt.Container.dispatchEventImpl(Unknown Source) 
at java.awt.Component.dispatchEvent(Unknown Source) 
at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 
at java.awt.EventQueue.access$000(Unknown Source) 
at java.awt.EventQueue$3.run(Unknown Source) 
at java.awt.EventQueue$3.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) 
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) 
at java.awt.EventQueue$4.run(Unknown Source) 
at java.awt.EventQueue$4.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source) 
at java.awt.EventQueue.dispatchEvent(Unknown Source) 
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) 
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) 
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) 
at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
at java.awt.EventDispatchThread.pumpEvents(Unknown Source) 
at java.awt.EventDispatchThread.run(Unknown Source) 


    Caused by: java.sql.SQLException: Invalid value for getInt() - 'N' 
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073) 
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987) 
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982) 
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927) 
at com.mysql.jdbc.ResultSetImpl.getInt(ResultSetImpl.java:2727) 
at com.mysql.jdbc.ResultSetImpl.getInt(ResultSetImpl.java:2815) 
at org.hibernate.type.IntegerType.get(IntegerType.java:51) 
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:184) 
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:173) 
at org.hibernate.type.AbstractType.hydrate(AbstractType.java:105) 
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2124) 
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1404) 
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1332) 
at org.hibernate.loader.Loader.getRow(Loader.java:1230) 
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:603) 
at org.hibernate.loader.Loader.doQuery(Loader.java:724) 
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259) 
at org.hibernate.loader.Loader.loadEntity(Loader.java:1881) 
... 48 more 

然后映射文件如下

<?xml version="1.0"?> 
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
            "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
<!-- Generated Apr 3, 2012 1:21:15 PM by Hibernate Tools 3.4.0.CR1 --> 
<hibernate-mapping> 
<class name="hibernate.tables.plain.ProductUnits" table="PRODUCT_UNITS"> 
    <composite-id mapped="false" unsaved-value="undefined"> 
    <key-many-to-one class="hibernate.tables.plain.Product" 
    column="Product_ID" name="product"/> 
    <key-many-to-one class="hibernate.tables.plain.Unit" column="Unit_ID" name="unit"/> 
    </composite-id> 
    <property generated="never" lazy="false" name="basePrice" type="java.lang.Double"> 
    <column name="BASE_PRICE"/> 
    </property> 
</class> 
</hibernate-mapping> 

和产品映射

<class name="hibernate.tables.plain.Product" table="PRODUCT"> 
     <id name="id" type="java.lang.Long"> 
      <column name="ID" /> 
      <generator class="assigned" /> 
     </id> 
     <property name="name" type="java.lang.String"> 
      <column name="NAME" /> 
     </property> 
     <property name="recommendedHolding" type="java.lang.Double"> 
      <column name="RECOMMENDED_HOLDING" /> 
     </property> 
     <set name="units" table="Product_Units" inverse="false" lazy="true"> 
      <key> 
       <column name="Product_ID" /> 
      </key> 
      <one-to-many class="hibernate.tables.plain.ProductUnits" /> 
     </set> 
     <property name="active" type="java.lang.Character"> 
      <column name="ACTIVE" /> 
     </property> 
    </class> 

Answer 1

存在您的问题：

Caused by: java.sql.SQLException: Invalid value for getInt() - 'N' 

Answer 2

似乎Hibernate在将字符值N映射到java.lang.Boolean时遇到问题。

如果您需要映射java.lang.Boolean也许最好使用java.lang.Boolean或org.hibernate.type.YesNoType而不是'java.lang.Character'。您可以在reference中阅读更多内容。

或者您需要使用java.lang.Character，请按照reference注册自定义类型。

Answer 3

好变化从人物到字符串

<property name="active" type="java.lang.String"> 
    <column name="ACTIVE" /> 
</property> 

Answer 4

属性类型我发现了另一个参考指出休眠蒙上了字符为int（即使文档状态字符是一个可用的数据类型...）。其他答案应该解决这个问题。或者我会建议你只使用一个varchar（1）来代替 - 相同的最终结果。

即）

@Column(name = "column", nullable = false, length = 1) 
public String getColumn() { 
    return column; 
} 

或

<property name="active" type="java.lang.String"> 
     <column name="ACTIVE" length="1"/> 
    </property> 

Answer 5

我怀疑你的问题是从你的映射设置arrising：

<composite-id mapped="false" unsaved-value="undefined"> 

注：

未保存值（可选 - 默认为“明智”值）： 指示实例最近的标识属性值 实例化（未保存），将其与 保存或加载到先前会话中的分离实例区分开。

该设置导致PRODUCT_UNITS不能持续。

Hibernate3中几乎不需要unsaved-value属性。

Answer 6

请检查persistence.xml文件添加适当的类 注：persistence.xml文件的 - 数据源不正确匹配