線程「主」中的異常org.hibernate.exception.GenericJDBCException：無法使用mySQL打開連接

Question

我想運行一個簡單的java項目來查看hibernate的工作，但是當我執行我的代碼時它給出了一個hibernate異常，我使用的MySQL 5.6和eclipse的霓虹燈，我甚至檢查授予訪問權限，一切似乎都很正常，請大家幫忙下面是代碼：

main.java

package com.demo; 

import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.Transaction; 
import org.hibernate.cfg.Configuration; 

public class Main { 

public static void main(String[] args) { 
    // TODO Auto-generated method stub 

    Session session = null; 
    SessionFactory sessionFactory= null; 

    //create sessionFactory 

    sessionFactory= new Configuration().configure().buildSessionFactory(); 


    // create Session 
    session=sessionFactory.openSession(); 
    // create and begin transaction 

    Transaction t = session.beginTransaction(); 

    //create contact object and set values to the object 

    Contact contact = new Contact(); 

    contact.setId(101); 
    contact.setFirstName("Dina"); 
    contact.setLastName("adams"); 
    contact.setEmailID("dina.adams@gmail.com"); 

    // insert record by saving session 

    session.save(contact); 

    session.flush(); 

    // commit transaction 

    t.commit(); 

    //close the session 

    session.close(); 




    } 

} 

contact.java

package com.demo; 

public class Contact { 
//properties 

private String firstName; 
private String lastName; 
private String emailID; 
private int id; 
public String getFirstName() { 
return firstName; 
} 
public void setFirstName(String firstName) { 
this.firstName = firstName; 
} 
public String getLastName() { 
return lastName; 
} 
public void setLastName(String lastName) { 
this.lastName = lastName; 
} 
public String getEmailID() { 
return emailID; 
} 
public void setEmailID(String emailID) { 
this.emailID = emailID; 
} 
public int getId() { 
return id; 
} 
public void setId(int id) { 
this.id = id; 
} 


} 

的hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?> 
    <!DOCTYPE hibernate-configuration PUBLIC 
"-//Hibernate/Hibernate Configuration DTD//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.url">jdbc:mysql://localhost:3306/emp</property> 
<property name="hibernate.connection.usename">rajesh</property> 
<property name="hibernate.connection.password">Nepal123</property> 
<property name="hibernate.connection.poolsize">10</property> 
<property name="show_sql">true</property> 
<property name="dialect">org.hibernate.dialect.MySQLDialect</property> 
<property name="hibernate.hbm2ddl.auto">update</property> 

<!-- Mapping file --> 
<mapping resource="Contact.hbm.xml"/> 

</session-factory> 

</hibernate-configuration> 

contact.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 = "com.demo.Contact" table="Contact"> 
<id column= "ID" name="id" type= "int" > 
<generator class = "assigned"></generator> 
</id> 

<property name = "firstName"> 
<column name="FIRST NAME"></column> 
</property> 
<property name="lastName"> 
<column name="LAST NAME"></column> 
</property> 
<property name="emailID"> 
<column name ="EMAIL ID"></column> 

</property> 
</class> 
</hibernate-mapping> 

錯誤消息： -

Exception in thread "main" org.hibernate.exception.GenericJDBCException: Cannot open connection 
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103) 
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91) 
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43) 
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29) 
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:426) 
at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144) 
at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:119) 
at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57) 
at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326) 
at com.demo.Main.main(Main.java:25) 
Caused by: java.sql.SQLException: Access denied for user ''@'localhost' (using password: YES) 
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:963) 
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3966) 
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3902) 
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:875) 
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1712) 
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1228) 
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2253) 
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284) 
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083) 
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806) 
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) 
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) 
at java.lang.reflect.Constructor.newInstance(Unknown Source) 
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) 
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410) 
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328) 
at java.sql.DriverManager.getConnection(Unknown Source) 
at java.sql.DriverManager.getConnection(Unknown Source) 
at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:110) 
at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:423) 
... 5 more 

Answer 1

看看這個標籤：

<property name="hibernate.connection.usename">rajesh</property> 

的名稱應該是代替hibernate.connection.usernamehibernate.connection.usename。