完整的错误是..................
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Initial SessionFactory creation failed.org.hibernate.HibernateException: JDBC Driver
class not found: com.mysql.jdbc.Driver
Exception in thread "main" java.lang.ExceptionInInitializerError
at hibernate.HibernateUtil.<clinit>(HibernateUtil.java:26)
at hibernate.TestMain.updateUser(TestMain.java:123)
at hibernate.TestMain.main(TestMain.java:35)
Caused by: org.hibernate.HibernateException: JDBC Driver class not found:
com.mysql.jdbc.Driver
at
org.hibernate.connection.DriverManagerConnectionProvider.
configure(DriverManagerConnectionProvider.java:66)
at org.hibernate.connection.ConnectionProviderFactory.
newConnectionProvider(ConnectionProviderFactory.java:124)
at org.hibernate.connection.ConnectionProviderFactory.
newConnectionProvider(ConnectionProviderFactory.java:56)
at
org.hibernate.cfg.SettingsFactory.createConnectionProvider(SettingsFactory.java:397)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:62)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2006)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1289)
at hibernate.HibernateUtil.<clinit>(HibernateUtil.java:21)
... 2 more
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:100)
at
org.hibernate.connection.DriverManagerConnectionProvider.
configure(DriverManagerConnectionProvider.java:61)
... 9 more
我是新来的冬眠请任何人帮助我......... 我的Users.hbm.xml文件是.....
<?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 entity-name="Users" name="hibernate.Users" table="users">
<meta attribute="description">This class is used to save the info about users</meta>
<id column="UserId" name="UserId" type="long"/>
<property column="FName" name="FName" type="string"/>
<property column="LName" name="LName" type="string"/>
<property column="UserTypeId" name="UserTypeId" type="long"/>
<property column="UserName" name="UserName" type="string"/>
<property column="Email" name="Email" type="string"/>
<property column="Pwd" name="Pwd" type="string"/>
<property column="Note" name="Note" type="string"/>
<property column="IsActive" name="IsActive" type="boolean"/>
</class>
</hibernate-mapping>
hibernate.cfg.xml文件是........
<?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">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">tiger</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3307/userdb</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<mapping resource="hibernate/Users.hbm.xml"/>
</session-factory>
</hibernate-configuration>
我的Users.java pgm是..........
package hibernate;
// Generated 4 Dec, 2013 5:13:45 PM by Hibernate Tools 3.4.0.CR1
/**
* Users generated by hbm2java
*/
public class Users implements java.io.Serializable {
private long UserId;
private String FName;
private String LName;
private long UserTypeId;
private String UserName;
private String Email;
private String Pwd;
private String Note;
private boolean IsActive;
public Users() {
}
public Users(long UserId) {
this.UserId = UserId;
}
public Users(long UserId, String FName, String LName, long UserTypeId,
String UserName, String Email, String Pwd, String Note,
boolean IsActive) {
this.UserId = UserId;
this.FName = FName;
this.LName = LName;
this.UserTypeId = UserTypeId;
this.UserName = UserName;
this.Email = Email;
this.Pwd = Pwd;
this.Note = Note;
this.IsActive = IsActive;
}
public long getUserId() {
return this.UserId;
}
public void setUserId(long UserId) {
this.UserId = UserId;
}
public String getFName() {
return this.FName;
}
public void setFName(String FName) {
this.FName = FName;
}
public String getLName() {
return this.LName;
}
public void setLName(String LName) {
this.LName = LName;
}
public long getUserTypeId() {
return this.UserTypeId;
}
public void setUserTypeId(long UserTypeId) {
this.UserTypeId = UserTypeId;
}
public String getUserName() {
return this.UserName;
}
public void setUserName(String UserName) {
this.UserName = UserName;
}
public String getEmail() {
return this.Email;
}
public void setEmail(String Email) {
this.Email = Email;
}
public String getPwd() {
return this.Pwd;
}
public void setPwd(String Pwd) {
this.Pwd = Pwd;
}
public String getNote() {
return this.Note;
}
public void setNote(String Note) {
this.Note = Note;
}
public boolean isIsActive() {
return this.IsActive;
}
public void setIsActive(boolean IsActive) {
this.IsActive = IsActive;
}
}
HibernateUtil.java pgm是........
package hibernate;
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;
}
}
我的TestMain程序是......
package hibernate;
import hibernate.Users;
import hibernate.HibernateUtil;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.Transaction;
public class TestMain {
/**
* @param args
*/
public static void main(String[] args) {
TestMain obj = new TestMain();
//obj.saveRecord();
obj.updateUser(12);
obj.deleteUser(13);
obj.getList();
}
public void saveRecord()
{
Users u = new Users(0, "Jitendra", "Zaa", 1, "jitendra.zaa",
"jitendra.zaa@shivasoft.in", "test", "this is note", true);
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction = null;
try
{
transaction = session.beginTransaction();
session.save(u);
transaction.commit();
System.out.println("Data Saved");
}catch(Exception e)
{
e.printStackTrace();
}finally{session.close();}
}
public void deleteUser(long UserId)
{
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction = null;
try
{
transaction = session.beginTransaction();
Users u = (Users)session.get(Users.class,UserId);
session.delete(u);
transaction.commit();
System.out.println("Data Deleted");
}
catch(Exception e)
{
e.printStackTrace();
}
finally{
session.close();
}
}
public void updateUser(long UserId)
{
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction = null;
try
{
transaction = session.beginTransaction();
Users u = (Users)session.get(Users.class,UserId);
u.setFName("ShivaSoft");
transaction.commit();
System.out.println("Data Updated");
}
catch(Exception e)
{
e.printStackTrace();
}
finally{
session.close();
}
}
public void getList()
{
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction transaction = null;
try
{
transaction = session.beginTransaction();
List<Users> uList = session.createQuery("from Users").list();
for(Users u : uList)
{
System.out.println("First Name - "+u.getFName());
}
}
catch(Exception e)
{
e.printStackTrace();
}
finally{
session.close();
}
}
}
请帮助我.......
答案 0 :(得分：1)
未找到类：com.mysql.jdbc.Driver
1）。请首先确认您的lib文件夹中有mysql.connector.java.jar文件 或者这是jar成功添加你的项目