[Hibernate]错误：未找到实体类： [英] [Hibernate]Error: entity class not found:
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问题描述
Uzytkownik.hbm.xml
;？xml version =1.0encoding =UTF-8？>
<！DOCTYPE hibernate-mapping PUBLIC - // Hibernate / Hibernate映射DTD 3.0 // EN
http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd\"> ;
< hibernate-mapping>
< class name =Uzytkowniktable =uzytkownicy>
< id column =idname =idtype =int/>
< property column =logingenerated =neverlazy =falsename =logintype =string/>
< property column =haslogenerated =neverlazy =falsename =haslotype =string/>
< / class>
< / hibernate-mapping>
hibernate.cfg.xml：
<？xml version =1.0encoding =UTF-8？>
<！DOCTYPE hibernate-configuration PUBLIC - // Hibernate / Hibernate配置DTD 3.0 // EN
http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd\"> ;
< hibernate-configuration>
< session-factory name =>
< property name =hibernate.connection.driver_class> org.gjt.mm.mysql.Driver< / property>
< property name =hibernate.connection.password> root< / property>
< property name =hibernate.connection.url> jdbc：mysql：// localhost / sprawozdania< / property>
< property name =hibernate.connection.username> root< / property>
< property name =hibernate.dialect> org.hibernate.dialect.MySQL5Dialect< / property>
< mapping resource =com / vaannila / uzytkownik / Uzytkownik.hbm.xml/>
< / session-factory>
< / hibernate-configuration>
我使用mysql 5.5。
得到以下错误：
线程main中的异常java.lang.ExceptionInInitializerError
在com.vaannila.util .HibernateUtil。< clinit>（HibernateUtil.java:14）
at com.vaannila.uzytkownik.Main.saveUzyt（Main.java:22）
at com.vaannila.uzytkownik.Main.main（ Main.java:16）
导致：org.hibernate.MappingException：未找到实体类：Uzytkownik
这是我的课程：
main.java
package com.vaannila.uzytkownik;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import javax.persistence.Entity;
import com.vaannila.util.HibernateUtil;
public class Main {
/ **
* @param args
* /
public static void main（String [] args）{
Main obj = new Main（）;
String uzytkownikLogin = obj.saveUzyt（Adam，Malysz）;
}
public String saveUzyt（String login，String haslo）{
会话session = HibernateUtil.getSessionFactory（）。openSession（）;
事务transaction = null;
String uzytLog = null;
try {
transaction = session.beginTransaction（）;
Uzytkownik uzyt = new Uzytkownik（）;
uzyt.setLogin（login）;
uzyt.setHaslo（haslo）;
uzytLog =（String）session.save（uzyt）;
transaction.commit（）;
} catch（HibernateException e）{
transaction.rollback（）;
e.printStackTrace（）;
} finally {
session.close（）;
}
return uzytLog;
}
}
Uzytkownik.java：
package com.vaannila.uzytkownik;
//默认包
//生成2011-07-14 13:39:18由Hibernate Tools 3.4.0.CR1
/ **
* Uzytkownik由hbm2java生成
* /
public class Uzytkownik实现java.io.Serializable {
private int id;
private String login;
private String haslo;
public Uzytkownik（）{
}
public Uzytkownik（int id）{
this.id = id;
}
public Uzytkownik（int id，String login，String haslo）{
this.id = id;
this.login = login;
this.haslo = haslo;
}
public int getId（）{
return this.id;
}
public void setId（int id）{
this.id = id;
}
public String getLogin（）{
return this.login;
}
public void setLogin（String login）{
this.login = login;
}
public String getHaslo（）{
return this.haslo;
}
public void setHaslo（String haslo）{
this.haslo = haslo;
}
}
HibernateUtil.java：
package com.vaannila.util;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
sessionFactory = new Configuration（）。configure（）。buildSessionFactory（）;
} catch（Throwable ex）{
System.err.println（Initial SessionFactory creation failed。+ ex）;
抛出新的ExceptionInInitializerError（ex）;
}
}
public static SessionFactory getSessionFactory（）{
return sessionFactory;
}
}
解决方案
也许你的映射文件不完整，但其他明智之举应该是：
< class name =com.vaannila .uzytkownik.Uzytkowniktable =uzytkownicy>
=>需要设置完全限定的类名（带包）
I get tired of this for a long time. I do not know what caused this error. Here are my files:
Uzytkownik.hbm.xml
<?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="Uzytkownik" table="uzytkownicy">
<id column="id" name="id" type="int"/>
<property column="login" generated="never" lazy="false" name="login" type="string"/>
<property column="haslo" generated="never" lazy="false" name="haslo" type="string"/>
</class>
</hibernate-mapping>
hibernate.cfg.xml:
<?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 name="">
<property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/sprawozdania</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<mapping resource="com/vaannila/uzytkownik/Uzytkownik.hbm.xml"/>
</session-factory>
</hibernate-configuration>
I use mysql 5.5.
I get the following error:
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.vaannila.util.HibernateUtil.<clinit>(HibernateUtil.java:14)
at com.vaannila.uzytkownik.Main.saveUzyt(Main.java:22)
at com.vaannila.uzytkownik.Main.main(Main.java:16)
Caused by: org.hibernate.MappingException: entity class not found: Uzytkownik
This are my classes: main.java
package com.vaannila.uzytkownik;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import javax.persistence.Entity;
import com.vaannila.util.HibernateUtil;
public class Main {
/**
* @param args
*/
public static void main(String[] args) {
Main obj = new Main();
String uzytkownikLogin = obj.saveUzyt("Adam", "Malysz");
}
public String saveUzyt(String login, String haslo){
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction = null;
String uzytLog = null;
try {
transaction = session.beginTransaction();
Uzytkownik uzyt = new Uzytkownik();
uzyt.setLogin(login);
uzyt.setHaslo(haslo);
uzytLog = (String) session.save(uzyt);
transaction.commit();
} catch (HibernateException e) {
transaction.rollback();
e.printStackTrace();
} finally {
session.close();
}
return uzytLog;
}
}
Uzytkownik.java:
package com.vaannila.uzytkownik;
// default package
// Generated 2011-07-14 13:39:18 by Hibernate Tools 3.4.0.CR1
/**
* Uzytkownik generated by hbm2java
*/
public class Uzytkownik implements java.io.Serializable {
private int id;
private String login;
private String haslo;
public Uzytkownik() {
}
public Uzytkownik(int id) {
this.id = id;
}
public Uzytkownik(int id, String login, String haslo) {
this.id = id;
this.login = login;
this.haslo = haslo;
}
public int getId() {
return this.id;
}
public void setId(int id) {
this.id = id;
}
public String getLogin() {
return this.login;
}
public void setLogin(String login) {
this.login = login;
}
public String getHaslo() {
return this.haslo;
}
public void setHaslo(String haslo) {
this.haslo = haslo;
}
}
HibernateUtil.java:
package com.vaannila.util;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
解决方案
Maybe your mapping file is not complete but other wise it should be:
<class name="com.vaannila.uzytkownik.Uzytkownik" table="uzytkownicy">
=> need to set fully qualified class name (with package)
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