S2SH 框架 Web项目 空指针问题

本人新手，用S2SH做了个web项目，现在遇到了一个自己无解的问题，特此希望各位大哥能帮帮我，下面是问题：
applicationContext.xml 文件部分内容：
<bean id="videoDao" class="com.zpy.dao.impl.VideoDaoImpl">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<bean id="videoBiz" class="com.zpy.biz.impl.VideoBizImpl">
<property name="videoDao" ref="videoDao"></property>
</bean>
<bean id="videoAction" class="com.zpy.action.VideoAction">
<property name="videoBiz" ref="videoBiz"></property>
</bean>
Struts.xml 部分内容：
<action name="video" class="videotypeAction"><!-- 前台 -->
                      
            <result name="allVideo"><!-- 前台首页，查询所有视频 -->
              admin/VideoList.jsp
            </result>            
            <result name="videoList" ><!-- 查指定类型视频（前台首页） -->
              index.jsp
            </result>            
                       
            <result name="findVideoById"><!-- 按编号查询视频（点击播放）-->
              player.jsp
            </result>            
            <result name="no"><!-- 发生异常的时候-->
              player.jsp
            </result>            
        </action>
VideoDaoImpl ：dao的实现类 继承HibernateDaoSupport  
public Video getVideoByVideoId(int vid) {
System.out.println("this is video daoimpl ");
List<Video> videoList=this.getHibernateTemplate().findByCriteria(DetachedCriteria.forClass(Video.class)
.add(Restrictions.eq("vid",vid)));
System.out.println(videoList.size());//
if(videoList.size()>0)
return videoList.get(0);
else
return null;
}这是我的一个测试方法，有值，可以查到：
@Test
public void TTTT()
{
ApplicationContext act=new ClassPathXmlApplicationContext("applicationContext.xml");
IVideoBiz type=(IVideoBiz)act.getBean("videoBiz");
//ok
Video v=type.getVideoByVideoId(7);

System.out.println(v.getVtitle());//在这有值


}
VideoAction类
public String findVideoById()
{
try {
System.out.println(video.getVid()+"-----------");//视频ID有值
videoBiz.saveOrUpdateProgramme(video.getVid());//  空对象错误  下边不在执行。。
System.out.println("增加点播次数--");
Video v=videoBiz.getVideoByVideoId(video.getVid());//空对象错误

session.put("videos",v);
return "findVideoById";
} catch (Exception e) {

e.printStackTrace();
return "no";
}
}这是错误信息： at com.zpy.action.VideoAction.findVideoById(VideoAction.java:107)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
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:230)
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:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)前边逻辑部分的代码应该没问题，测试也有值，只是在action里调用方法是就显示空指针了，也在网上找了有关这个问题的但是都很模糊，这个问题困扰了我几天了，好几处都是这个错误，实在是快疯了，

解决方案 »

  1.   

    是不是没有加strut2的默认拦截器啊？ 把struts2默认的拦截器栈
      

  2.   

    把这个加上：<interceptor-ref name="defaultStack" />
      

  3.   

    是这个吗？在struts-default.xml中
     <!-- The completeStack is here for backwards compatibility for
                     applications that still refer to the defaultStack by the
                     old name -->
                <interceptor-stack name="completeStack">
                    <interceptor-ref name="defaultStack"/>
                </interceptor-stack>            <!-- Sample execute and wait stack.
                     Note: execAndWait should always be the *last* interceptor. -->
                <interceptor-stack name="executeAndWaitStack">
                    <interceptor-ref name="execAndWait">
                        <param name="excludeMethods">input,back,cancel</param>
                    </interceptor-ref>
                    <interceptor-ref name="defaultStack"/>
                    <interceptor-ref name="execAndWait">
                        <param name="excludeMethods">input,back,cancel</param>
                    </interceptor-ref>
                </interceptor-stack>
      

  4.   

    videoBiz.saveOrUpdateProgramme(video.getVid());videoBiz是null吗？没有注入进来？
      

  5.   

    spring注入没问题，前边测试都可以的