jsf+hibernate+sqlserver;
jsf页面
<h:dataTable value="#{projectinfo.allprojectinfo}" var="projectinfo">
faces-config.xml中
<managed-bean>
      <managed-bean-name>projectinfo</managed-bean-name>
      <managed-bean-class>lab2.ProjectInfoBean</managed-bean-class>
      <managed-bean-scope>session</managed-bean-scope>
   </managed-bean>
ProjectInfoBean中
public List getAllprojectinfo() throws HibernateException {  
            String queryString = "select * from ProjectInfo as o";  
            session = sessionFactory.openSession();  
            transaction = session.beginTransaction();             
            Query query = session.createQuery(queryString);  
      
             List result=query.list();
             return result;
        }  
运行时
javax.servlet.ServletException: javax.faces.el.EvaluationException: Error getting property 'allprojectinfo' from bean of type lab2.ProjectInfoBean: java.lang.NoClassDefFoundError: javax/transaction/Synchronization
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:864)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:800)
org.apache.jsp.xiangmuxi_jsp._jspService(xiangmuxi_jsp.java:74)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
.......
报错,不知道该怎么改?
请大家指点一下.

'allprojectinfo' 这个list 写get 方法了吗  如过用的是ejb3的话需要在方法上加一个@Factory("allprojectinfo")标记