求救啊!!struts+spring+hibernate初学者的一个问题

我在做小例子过程中老出现,  
tomcat一启动就出现,如下错误  
org.apache.catalina.core.ApplicationContext   log  
严重:   action:   null  
org.springframework.beans.factory.BeanCreationException:   Error   creating   bean   with   name   'sessionFactory '   defined   in   ServletContext   resource   [/WEB-INF/applicationContext.xml]:   Invocation   of   init   method   failed;   nested   exception   is   java.lang.NoSuchMethodError:   org.objectweb.asm.ClassVisitor.visit(IILjava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)V  
Caused   by:   java.lang.NoSuchMethodError:   org.objectweb.asm.ClassVisitor.visit(IILjava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)V  
请问为什么,当我把spring中 <property   name= "mappingResources "> ..... </property> 删除时候,启动tomcat就不会出错,但是我看了*.hbm.xml文件,绝对不会出错的,而且我就算用别人可以运行的原代码也不行,出是同样错误,请帮帮忙  
User.hbm.xml文件  
<?xml   version= "1.0 "?>  
<!DOCTYPE   hibernate-mapping   PUBLIC   "-//Hibernate/Hibernate   Mapping   DTD   3.0//EN "  
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd ">  
<!--  
Mapping   file   autogenerated   by   MyEclipse   -   Hibernate   Tools  
-->  
<hibernate-mapping>  
<class   name= "org.tie.vo.User "   table= "user "   catalog= "tie ">  
<id   name= "id "   type= "java.lang.Integer ">  
<column   name= "id "   />  
<generator   class= "native "   />  
</id>  
<property   name= "username "   type= "java.lang.String ">  
<column   name= "username "   length= "10 "   not-null= "true "   />  
</property>  
<property   name= "password "   type= "java.lang.String ">  
<column   name= "password "   length= "10 "   not-null= "true "   />  
</property>  
<property   name= "email "   type= "java.lang.String ">  
<column   name= "email "   length= "50 "   not-null= "true "   />  
</property>  
</class>  
</hibernate-mapping>  
因为在我什么功能都没做,所以applicationContext.xml文件中没有什么内容  
如下  
<bean   id= "dataSource "  
class= "org.apache.commons.dbcp.BasicDataSource ">  
<property   name= "driverClassName "  
value= "com.mysql.jdbc.Driver ">  
</property>  
<property   name= "url "  
value= "jdbc:mysql://localhost:3306/mydata ">  
</property>  
<property   name= "username "   value= "root "> </property>  
<propert