java 休眠错误：org.hibernate.InvalidMappingException：无法从资源解析映射文档
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Hibernate Error: org.hibernate.InvalidMappingException: Could not parse mapping document from resource
提问by MindHacks
When I run the project, it occurs an exception as below. Before I add a view table in Hibernate, everyting got well include the Blame.hbm.xml and others. And it could read the data from database. The exception occurs in ShowOrderDaoImpl.java at this sentence: session=HibernateSessionFactory.getSession();
当我运行项目时，它发生如下异常。在我在 Hibernate 中添加视图表之前，一切都很好，包括 Blame.hbm.xml 和其他。它可以从数据库中读取数据。在 ShowOrderDaoImpl.java 这句话中出现异常：session=HibernateSessionFactory.getSession();
My exception
我的例外
org.hibernate.InvalidMappingException: Could not parse mapping document from resource pojo/Blame.hbm.xml
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:3415)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXmlQueue(Configuration.java:3404)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3392)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1341)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1737)
at session.factory.HibernateSessionFactory.rebuildSessionFactory(HibernateSessionFactory.java:75)
at session.factory.HibernateSessionFactory.getSession(HibernateSessionFactory.java:57)
at dao.impl.ShowOrderDaoImpl.queryTradesByBid(ShowOrderDaoImpl.java:24)
at test.testHibernate.main(testHibernate.java:45)
Caused by: org.hibernate.DuplicateMappingException: Duplicate class/entity mapping pojo.Blame
ok
at org.hibernate.cfg.Configuration$MappingsImpl.addClass(Configuration.java:2580)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:174)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processHbmXml(Configuration.java:3412)
... 8 more
java.lang.NullPointerException
at dao.impl.ShowOrderDaoImpl.queryTradesByBid(ShowOrderDaoImpl.java:25)
at test.testHibernate.main(testHibernate.java:45)
my hibernate.cfg.xml file
我的 hibernate.cfg.xml 文件
<?xml version="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">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/disputesystem</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.show_sql">true</property>
<mapping resource="pojo/Blame.hbm.xml"/>
<mapping resource="pojo/Buyer.hbm.xml"/>
<mapping resource="pojo/Dispute.hbm.xml"/>
<mapping resource="pojo/Evidence.hbm.xml"/>
<mapping resource="pojo/Goods.hbm.xml"/>
<mapping resource="pojo/Message.hbm.xml"/>
<mapping resource="pojo/Record.hbm.xml"/>
<mapping resource="pojo/Seller.hbm.xml"/>
<mapping resource="pojo/Staff.hbm.xml"/>
<mapping resource="pojo/Trade.hbm.xml"/>
<mapping resource="pojo/Fund.hbm.xml"/>
<mapping resource="pojo/Showorderbybid.hbm.xml"/>
</session-factory>
</hibernate-configuration>
my ShowOrderDaoImpl.java file
我的 ShowOrderDaoImpl.java 文件
package dao.impl;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import pojo.Showorderbybid;
import session.factory.HibernateSessionFactory;
import dao.intf.ShowOrderDao;
public class ShowOrderDaoImpl implements ShowOrderDao{
@Override
public List<Showorderbybid> queryTradesByBid(String bid) throws Exception {
Session session=null;
Transaction transaction=null;
List<Showorderbybid> orders=new ArrayList<Showorderbybid>();
try {
session=HibernateSessionFactory.getSession();
transaction=session.beginTransaction();
Query query=session.createQuery("from Showorderbybid where bid=?");
query.setParameter(0, bid);
orders=(List<Showorderbybid>)query.list();
List CountView = new ArrayList();
Iterator it = orders.iterator();
while (it.hasNext()) {
Object[] all = (Object[]) it.next();
Showorderbybid countViewId = new Showorderbybid();
countViewId.setAmount((Integer) all[0]);
countViewId.setBid((String) all[1]);
countViewId.setDetail((String) all[2]);
countViewId.setGid((String)all[3]);
countViewId.setGname((String)all[4]);
countViewId.setLogistics((String)all[5]);
countViewId.setSid((String)all[6]);
countViewId.setSname((String)all[7]);
countViewId.setStatus((String)all[8]);
countViewId.setTid((String)all[9]);
countViewId.setTotalmoney((Integer) all[10]);
countViewId.setTradetime((Date)all[11]);
orders.add(countViewId);
}
} catch (Exception e) {
e.printStackTrace();
}finally{
HibernateSessionFactory.closeSession();
}
return orders;
}
}
my Blame.hbm.xml file
我的 Blame.hbm.xml 文件
<?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 2013-4-19 23:02:05 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="pojo.Blame" table="blame" catalog="disputesystem">
<id name="id" type="java.lang.Integer">
<column name="id" />
<generator class="identity" />
</id>
<many-to-one name="dispute" class="pojo.Dispute" fetch="select">
<column name="disputeid" length="20" not-null="true" />
</many-to-one>
<property name="blametime" type="timestamp">
<column name="blametime" length="19" not-null="true" />
</property>
<property name="content" type="string">
<column name="content" length="1000" />
</property>
</class>
</hibernate-mapping>
回答by ssedano
Looks like there is another mapping for pojo.Blame. You might had a copy/pastemistake:
看起来还有另一个映射pojo.Blame. 你可能copy/paste犯了一个错误：
<class name="pojo.Blame"
In another hbmfile.
在另一个hbm文件中。
This
这
Caused by: org.hibernate.DuplicateMappingException: Duplicate class/entity mapping pojo.Blame
States that when reached a hbmfile it already has a definition for a class named pojo.Blame.
声明当到达一个hbm文件时，它已经有一个名为pojo.Blame.
Looks like in some of this files:
在其中一些文件中看起来像：
<mapping resource="pojo/Blame.hbm.xml"/>
<mapping resource="pojo/Buyer.hbm.xml"/>
<mapping resource="pojo/Dispute.hbm.xml"/>
<mapping resource="pojo/Evidence.hbm.xml"/>
<mapping resource="pojo/Goods.hbm.xml"/>
<mapping resource="pojo/Message.hbm.xml"/>
<mapping resource="pojo/Record.hbm.xml"/>
<mapping resource="pojo/Seller.hbm.xml"/>
<mapping resource="pojo/Staff.hbm.xml"/>
<mapping resource="pojo/Trade.hbm.xml"/>
<mapping resource="pojo/Fund.hbm.xml"/>
<mapping resource="pojo/Showorderbybid.hbm.xml"/>
Is a misplaced <class name="pojo.Blame"
是错位 <class name="pojo.Blame"
回答by yassine.chaf
be sure that you have overrided the equals/tostring and hash methodes in your Pojo
确保你已经覆盖了 Pojo 中的 equals/tostring 和 hash 方法
回答by Sajith Silva
check why the session=HibernateSessionFactory.getSession(); is getting null. That is the reason for the null pointer
检查为什么 session=HibernateSessionFactory.getSession(); 正在变空。这就是空指针的原因
