Java學習筆記--Hibernate架構錯誤集合及解決

標籤：

錯誤1：MappingException: Unknown entity解決方案

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

 

錯誤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 JNDIjavax.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)

 在網上找到如下內容：

（3）報錯：Could not bind factory to JNDI
此錯誤是設定檔的問題，如果hibernate設定檔有session_factory_name這個變數，<session-factory name="foo"> 會試圖將一個SessionFactory執行個體以foo為名bind到jndi上，而有的application container不支援jndi綁定。把這個變數去掉即可。

解決問題 

把引用代碼也要修改：
大致改成這樣：

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

  

錯誤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

原來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>

修改為

    <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>

 

錯誤4：Attribute "column" must be declared for element type "property"解決辦法

自己寫的xxx.hbm.xml檔案 出現錯誤：
Attribute "column" must be declared for element type"property"
這個錯誤是因為自己把hibernate.cfg.xml的檔案頭直接複製到了xxx.hbm.xml（在這裡為Customer.hbm.xml）中

hibernate.cfg.xml的檔案頭：

<?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">

這個應該改為mapping的標頭檔就行了

Customer.hbm.xml的檔案頭

<?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">

然後在裡面編寫自己的映射就行了。

 

錯誤5：not found while looking for property錯誤

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

設定檔如下

<?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>

發現自己的配置好像沒有問題。在網上搜尋到了原因:連結

按照裡面的方法把每個值都加上屬性即可。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>

 

Java學習筆記--Hibernate架構錯誤集合及解決