Hibernate问题与使用http://www.hibernate.org/dtd

问题描述

我目前在我的hibernate配置文件中使用作为我的命名空间它给了我这些警告：

lockquote

识别过时的hibernate命名空间
。改为使用命名空间
。请参阅Hibernate 3.6
迁移指南！

所以我尝试了切换hibernate.cfg.xml和所有其他* .hbm .xml文件转换为使用。然而，当我尝试在eclipse中使用hibernate工具生成代码时，我得到以下错误消息（代码生成可以与其他命名空间一起工作）：

这是我的hibernate.cfg.xml：

 <？xml version ='1.0'encoding ='utf-8'？> 
<！DOCTYPE hibernate-configuration PUBLIC 
 -  // Hibernate / Hibernate配置DTD 3.0 // EN
http://www.hibernate.org/dtd/hibernate-configuration -3.0.dtd> 
 
< hibernate-configuration> 
< session-factory> 
 < property name =connection.driver_class> 
 com.mysql.jdbc.Driver 
< / property> 
< property name =connection.url> 
 jdbc：mysql：// localhost：3306 / findata？tcpKeepAlive = true 
< / property> 
< property name =connection.username> root< / property> 
< property name =connection.password> xxxxxxxx< / property> 
 
< property name =connection.pool_size> 2< / property> 
< property name =show_sql> true< / property> 
< property name =dialect> 
 org.hibernate.dialect.MySQLDialect 
< / property> 
< property name =current_session_context_class>线程< / property> 
< property name =cache.provider_class> 
 org.hibernate.cache.NoCacheProvider 
< / property> 
 
< mapping resource =conf / Alert.hbm.xml/> 
< mapping resource =conf / Entity.hbm.xml/> 
< mapping resource =conf / FactData.hbm.xml/> 
< mapping resource =conf / TimeEvent.hbm.xml/> 
< mapping resource =conf / User.hbm.xml/> 
< mapping resource =conf / AlertTarget.hbm.xml/> 
< mapping resource =conf / LogAlert.hbm.xml/> 
< mapping resource =conf / RepeatType.hbm.xml/> 
< mapping resource =conf / Schedule.hbm.xml/> 
< mapping resource =conf / Task.hbm.xml/> 
< mapping resource =conf / JobQueue.hbm.xml/> 
< mapping resource =conf / LogTask.hbm.xml/> 
< mapping resource =conf / Exclude.hbm.xml/> 
< mapping resource =conf / LogNotification.hbm.xml/> 
< mapping resource =conf / Job.hbm.xml/> 
< mapping resource =conf / Metric.hbm.xml/> 
< mapping resource =conf / EntityGroup.hbm.xml/> 
< mapping resource =conf / ExtractSingle.hbm.xml/> 
< / session-factory> 
< / hibernate-configuration> 
  

解决方案

我们在上次解析hibernate cfg文件时也遇到一些问题时间。原因的根源在于休眠站点无法访问。经过一些搜索和调试org.hibernate.util.DTDEntityResolver类后，我意识到还有另外一种方式，如何指定DTD URL：

 <！DOCTYPE hibernate-configuration SYSTEM 
classpath：//org/hibernate/hibernate-configuration-3.0.dtd> 
  

这意味着hibernate会从classpath加载DTD - 它通常包含在org / hibernate目录。

然而，我们使用hibernate 3.5.6 - 如果这种方法仍然适用于新版本，我不会知道 - 试试看吧。这样做的好处是，你完全独立于互联网连接，代理等等。

I'm currently using http://hibernate.sourceforge.net as my namespace in my hibernate configuration files which gives me these warnings:

So I tried switching hibernate.cfg.xml and all the other *.hbm.xml files to using http://www.hibernate.org/dtd. However then when I try to generate the code using hibernate tools in eclipse I get the following error message (code generation works fine with the other namespace):

Here's my hibernate.cfg.xml:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/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:3306/findata?tcpKeepAlive=true
        </property>
        <property name="connection.username">root</property>
        <property name="connection.password">xxxxxxxx</property>

        <property name="connection.pool_size">2</property>
        <property name="show_sql">true</property>
        <property name="dialect">
            org.hibernate.dialect.MySQLDialect
        </property>
        <property name="current_session_context_class">thread</property>
        <property name="cache.provider_class">
            org.hibernate.cache.NoCacheProvider
        </property>

        <mapping resource="conf/Alert.hbm.xml" />
        <mapping resource="conf/Entity.hbm.xml" />
        <mapping resource="conf/FactData.hbm.xml" />
        <mapping resource="conf/TimeEvent.hbm.xml" />
        <mapping resource="conf/User.hbm.xml" />
        <mapping resource="conf/AlertTarget.hbm.xml" />
        <mapping resource="conf/LogAlert.hbm.xml" />
        <mapping resource="conf/RepeatType.hbm.xml" />
        <mapping resource="conf/Schedule.hbm.xml" />
        <mapping resource="conf/Task.hbm.xml" />
        <mapping resource="conf/JobQueue.hbm.xml" />
        <mapping resource="conf/LogTask.hbm.xml" />
        <mapping resource="conf/Exclude.hbm.xml" />
        <mapping resource="conf/LogNotification.hbm.xml" />
        <mapping resource="conf/Job.hbm.xml" />
        <mapping resource="conf/Metric.hbm.xml" />
        <mapping resource="conf/EntityGroup.hbm.xml" />
        <mapping resource="conf/ExtractSingle.hbm.xml" />
    </session-factory>
</hibernate-configuration>

解决方案

We had also some problems parsing hibernate cfg files in last time. The root of the cause was that the hibernate site was unreachable. After some googling and debugging org.hibernate.util.DTDEntityResolver class, I realized that there is also another way, how to specify the DTD URL:

<!DOCTYPE hibernate-configuration SYSTEM
    "classpath://org/hibernate/hibernate-configuration-3.0.dtd">

This means that hibernate will load the DTD from classpath - it is usually included in hibernate jar in org/hibernate directory.

However, we use hibernate 3.5.6 - I don't hnow if this approach still works in the newer version - give it a try. The benefit of this is that you are completely independent on internet connection, proxies and so on.

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