在运行过程中，网页出现不了，求解析（java项目开发全程实录，第7章）

HTTP Status 500 - 

--------------------------------------------------------------------------------

type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: Servlet.init() for servlet dispatcher threw exception
org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:670)
org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:637)
org.apache.jsp.index_jsp._jspService(index_jsp.java:45)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root cause 

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/config/dao-config.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org/hibernate/cfg/HbmBinder$SecondPass
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:403)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:233)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:145)
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:277)
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:313)
org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.refresh(AbstractRefreshableWebApplicationContext.java:139)
org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:306)
org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:251)
org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:220)
org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:112)
javax.servlet.GenericServlet.init(GenericServlet.java:211)
org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:670)
org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:637)
org.apache.jsp.index_jsp._jspService(index_jsp.java:45)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
请问诸位老师，这是什么原因引起的？谢谢~