Hibernate学习笔记--Hibernate框架错误集合及解决

错误1：MappingException: Unknown entity解决方案

http://jingyan.baidu.com/article/e75aca8552761b142edac6cf.html

错误2：Could not bind factory to JNDI

2006-07-23 23:14:53,796 [main] WARN  org.hibernate.impl.SessionFactoryObjectFactory - Could not bind factory to JNDI
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
 at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645)
 at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:247)
 at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:284)
 at javax.naming.InitialContext.getNameParser(InitialContext.java:439)
 at org.hibernate.util.NamingHelper.bind(NamingHelper.java:52)
 at org.hibernate.impl.SessionFactoryObjectFactory.addInstance(SessionFactoryObjectFactory.java:90)
 at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:291)
 at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1176)
 at reene.study.hibernate.test.TestMain.main(TestMain.java:19)

在网上找到如下内容：

（3）报错：Could not bind factory to JNDI
此错误是配置文件的问题，如果hibernate配置文件有session_factory_name这个变量，<session-factory name="foo"> 会试图将一个SessionFactory实例以foo为名bind到jndi上，而有的application container不支持jndi绑定。把这个变量去掉即可。

解决问题

把引用代码也要修改：
大致改成这样：

SessionFactory sf = new Configuration().configure().buildSessionFactory();
Session session = sf.openSession();
Transaction tx = session.beginTransaction();

错误3： entity class not found: 

org.hibernate.MappingException: entity class not found: Customer
    at org.hibernate.mapping.PersistentClass.getMappedClass(PersistentClass.java:128)
    at org.hibernate.tuple.PropertyFactory.getGetter(PropertyFactory.java:390)
    at org.hibernate.tuple.PropertyFactory.buildIdentifierProperty(PropertyFactory.java:75)
    at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:145)
    at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:505)
    at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:144)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:163)
    at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:135)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:386)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1744)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1782)
    at com.session.Test.main(Test.java:15)
Caused by: java.lang.ClassNotFoundException: Customer
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:190)
    at org.hibernate.internal.util.ReflectHelper.classForName(ReflectHelper.java:192)
    at org.hibernate.mapping.PersistentClass.getMappedClass(PersistentClass.java:125)
    ... 15 more

修改Customer.hbm.xml

原来class name

    <class name="Customer" table="CUSTOMER">
        <id name="id" column="CID" type="java.lang.Integer">
            <generator class="increment" />
        </id>
        <property name="username" column="USERNAME" type="java.lang.String"/>
        <property name="password" column="PASSWORD" type="java.lang.String"/>
    </class>

修改为

    <class name="com.session.Customer" table="CUSTOMER">
        <id name="id" column="CID" type="java.lang.Integer">
            <generator class="increment" />
        </id>
        <property name="username" column="USERNAME" type="java.lang.String"/>
        <property name="password" column="PASSWORD" type="java.lang.String"/>
    </class>

错误4：Attribute "column" must be declared for element type "property"解决办法

自己写的xxx.hbm.xml文件 出现错误：
Attribute "column" must be declared for element type"property"
这个错误是因为自己把hibernate.cfg.xml的文件头直接复制到了xxx.hbm.xml（在这里为Customer.hbm.xml）中

hibernate.cfg.xml的文件头：

<?xmlversion='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
         "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

这个应该改为mapping的头文件就行了

Customer.hbm.xml的文件头

<?xmlversion="1.0" encoding="UTF-8"?>
<!DOCTYPEhibernate-mapping PUBLIC
         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
         "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

然后在里面编写自己的映射就行了。

错误5：not found while looking for property错误

not found while looking for property错误
Caused by: org.hibernate.MappingException: com.session.Customer not found while looking for property: id

配置文件如下

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE hibernate-mapping PUBLIC
         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
         "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="com.session.Customer" table="CUSTOMER">
        <id name="id" column="CID">
            <generator class="increment" />
        </id>
        <property name="username" column="USERNAME"/>
        <property name="password" column="PASSWORD"/>
    </class>
</hibernate-mapping>

发现自己的配置好像没有问题。在网上搜索到了原因:链接

按照里面的方法把每个值都加上属性即可。修改如下：

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE hibernate-mapping PUBLIC
         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
         "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <class name="com.session.Customer" table="CUSTOMER">
        <id name="id" column="CID" type="java.lang.Integer">
            <generator class="increment" />
        </id>
        <property name="username" column="USERNAME" type="java.lang.String"/>
        <property name="password" column="PASSWORD" type="java.lang.String"/>
    </class>
</hibernate-mapping>