hibernate异常：文档无效: 找不到语法

困扰了一晚上的问题，原来是这样坑爹。
昨晚刚学hibernate，跟着视频照做。但总是出现以下的异常。 文档无效: 找不到语法。

Exception in thread "main" org.hibernate.MappingException: invalid configuration
	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1535)
	at org.hibernate.cfg.Configuration.configure(Configuration.java:1476)
	at org.hibernate.cfg.Configuration.configure(Configuration.java:1462)
	at StudentTest.main(StudentTest.java:18)
Caused by: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 25; 文档无效: 找不到语法。
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:198)
	at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:437)
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:368)
	at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:325)
	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:228)
	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImp
<?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">

l$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:605)at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3138)at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:880)at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:117)at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)at org.dom4j.io.SAXReader.read(SAXReader.java:465)at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1532)... 3 more

<?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">

把这一段加在开头就行了。如下：

<?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>

        <!-- Database connection settings -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost/hibernate?useSSL=false</property> 
        <!-- <property name="connection.url">jdbc:mysql://localhost/hibernate</property> -->
        <property name="connection.username">root</property>
        <property name="connection.password">root</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> -->

        <!-- 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 and re-create the database schema on startup -->
      <property name="hbm2ddl.auto">update</property> 

        <mapping resource="com/hibernate/model/student.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

结论：
1.看视频要仔细，敲代码要小心。
2.代码要调试。
3.myeclipse的提示还是很准确，不要因为英文多感到头疼就不仔细看。这次的错误提示其实很准确，而且提示中就有解决方法。
4.发现问题就要分析问题，解决问题，防止下次出现同样的错误。

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