用structs2和hibernate3总是出错，各位大哥帮帮忙

Question

我用structs2和hibernate3写的小程序总是出错！ 
  
  我快崩溃来了，都不知道哪出错了，大家帮帮我吧！ 
  这个程序就只有两个jsp页面，一个是添加书名到数据库中，一个是查看书名。    能够登录到第一个页面但是一添加书名，跳转后就出现问题   抛出的错误如下：
Hibernate Dialect must be explicitly set
at org.hibernate.dialect.DialectFactory.determineDialect(DialectFactory.java:57)
at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:39)
at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:426)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:128)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2073)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1298)
at sunyang.service.BookServiceHibernateImpl.<clinit>(BookServiceHibernateImpl.java:20)
at sunyang.action.BookAction.<init>(BookAction.java:20)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at java.lang.Class.newInstance0(Class.java:350)
at java.lang.Class.newInstance(Class.java:303)
at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:119)
at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:150)
at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:139)
at com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:109)
at com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:287)
at com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:387)
at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:186)
at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)
at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:47)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:458)
at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:595)

Answer 1

hebernate的配置文件：
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration>
<session-factory >
<property name="show_sql">true</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/book</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver  </property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">admin</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<mapping resource="sunyang/domain/Book.hbm.xml"/>

</session-factory>
</hibernate-configuration>

Answer 2

加个方言 <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

Answer 3

你的配置文件是hibernate.cfg.xml还是hibernate.properties？
Configuration cfg = new Configuration().configure();
试试

Answer 4

你的hibernate配置是没有错误的 ，你从java文件中找找，或者看看配置文件的格式，比如中间有空格的：<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver  </property>