使用休眠與數據庫連接時出錯

Question

我正嘗試在使用休眠的數據庫上創建表。這是我的代碼

JAVA對象

包com.digitek.students;

import javax.persistence.Entity; 
import javax.persistence.Id; 
import javax.persistence.Table; 

@Entity 
@Table(name="studentInfo") 
public class StudentInfo { 

    @Id 
    private int rollNo; 
    public int getRollNo() { 
     return rollNo; 
    } 
    public void setRollNo(int rollNo) { 
     this.rollNo = rollNo; 
    } 
    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 
    private String name; 
} 

數據訪問對象

package com.digitek.students; 

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

public class Main { 

    public static void main(String[] args){ 

     StudentInfo student = new StudentInfo(); 
     student.setName("Rishit"); 
     student.setRollNo(47); 

     SessionFactory sf = new Configuration().configure().buildSessionFactory(); 
     Session session = sf.openSession(); 
     session.beginTransaction(); 
     session.save(student); 
     session.getTransaction().commit(); 
     session.close(); 
     sf.close(); 

    } 
} 

這裏是我的hibernate.config.xml文件

> <?xml version='1.0' encoding='utf-8'?> <!-- ~ Hibernate, Relational 
> Persistence for Idiomatic Java ~ ~ License: GNU Lesser General 
> Public License (LGPL), version 2.1 or later. ~ See the lgpl.txt file 
> in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>. 
> --> <!DOCTYPE hibernate-configuration PUBLIC 
>   "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
>   "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 
> 
> hibernate-configuration> 
> 
>  <session-factory> 
> 
>   <!-- Database connection settings --> 
>   <!-- <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> 
>      <property name="connection.url">jdbc:hsqldb:hsql://localhost/TestDB</property> 
> --> 
> 
>   <property name="connection.driver_class">org.mysql.Driver</property> 
>   <property name="connection.url">jdbc:mysql://localhost:3306/hibernatetutorials</property> 
>   <property name="connection.username">root</property> 
>   <property name="connection.password"></property> 
> 
>   <!-- JDBC connection pool (use the built-in) --> 
>   <property name="connection.pool_size">1</property> 
> 
>   <!-- SQL dialect --> 
>   <property name="dialect"> 
>    org.hibernate.dialect.MySQLDialect 
>   </property> 
> 
>   <!-- Enable Hibernate's automatic session context management --> 
>   <property name="current_session_context_class">thread</property> 
> 
>   <property name="cache.use_query_cache">true</property> 
>   <property name="cache.use_second_level_cache">true</property> 
>   <property name="cache.use_structured_entries">true</property> 
>   <property name="cache.region.factory_class">org.hibernate.cache.EhCacheRegionFactory</property> 
>   <property name="net.sf.ehcache.configurationResourceName">/hibernate-config/ehcache.xml</property> 
>   
>   <!-- Disable the second-level cache --> 
>   <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>   
>   
>  <!-- Echo all executed SQL to stdout --> 
>   <property name="show_sql">true</property> 
>   
>   <!-- Drop all existing tables and create new ones --> 
>   <property name="hbm2ddl.auto">create</property> 
> 
>   <mapping class="com.digitek.students.StudentInfo"/> 
> 
>  </session-factory> 
> 
> </hibernate-configuration> 

錯誤消息

Nov 02, 2015 11:02:26 AM org.hibernate.Version logVersion 
INFO: HHH000412: Hibernate Core {5.0.2.Final} 
Nov 02, 2015 11:02:26 AM org.hibernate.cfg.Environment <clinit> 
INFO: HHH000206: hibernate.properties not found 
Nov 02, 2015 11:02:26 AM org.hibernate.cfg.Environment buildBytecodeProvider 
INFO: HHH000021: Bytecode provider name : javassist 
Nov 02, 2015 11:02:26 AM org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity 
WARN: HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-configuration. Use namespace http://www.hibernate.org/dtd/hibernate-configuration instead. Support for obsolete DTD/XSD namespaces may be removed at any time. 
Exception in thread "main" org.hibernate.HibernateException: Error accessing stax stream 
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:107) 
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:65) 
    at org.hibernate.boot.cfgxml.internal.ConfigLoader.loadConfigXmlResource(ConfigLoader.java:57) 
    at org.hibernate.boot.registry.StandardServiceRegistryBuilder.configure(StandardServiceRegistryBuilder.java:163) 
    at org.hibernate.cfg.Configuration.configure(Configuration.java:259) 
    at org.hibernate.cfg.Configuration.configure(Configuration.java:245) 
    at com.digitek.students.Main.main(Main.java:15) 
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[12,1] 
Message: Content is not allowed in prolog. 
    at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(Unknown Source) 
    at com.sun.xml.internal.stream.XMLEventReaderImpl.peek(Unknown Source) 
    at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:103) 
    ... 6 more 

請幫我解決這。先謝謝你。

Answer 1

問題出在XML被評論的方式。

<!-- Database connection settings --> 

試試這個

<!-- 
<Database connection settings> 
--> 

How to comment a single line in XML?