开发中调用增加发放遇见问题 求大神..

Question

严重: Servlet.service() for servlet Dispatcher threw exception
java.lang.NullPointerException
at cn.damai.ticket.action.TicketCheckController.handleRequest(TicketCheckController.java:92)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:874)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:808)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:523)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:453)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
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:263)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)

Answer 1

自己调试代码吧：
at cn.damai.ticket.action.TicketCheckController.handleRequest(TicketCheckController.java:92)都提示的很清楚了，92行空指针。

Answer 2

ZwsCheck check = new ZwsCheck();
check.setName(name);
check.setZwsId(zwsId);
zwsCheckService.saveZws(check);
return new ModelAndView(successView)

Answer 3

调用savaZws（） 这一行报错。。check 上面也赋值了 

Answer 4

92行是哪行？是不是 zwsCheckService.saveZws(check); ？ 如果是的，那么说明 zwsCheckService 是null。

Answer 5

private ZwsCheckService zwsCheckService; public void setZwsCheckService(ZwsCheckService zwsCheckService) {
this.zwsCheckService = zwsCheckService;
} 
   这段不是调用了么 应该不是空的把 

Answer 6

啥时候、谁调用的 setZwsCheckService ？能确定么？建议你在刚才的那段代码前面加个：
System.out.println("zwsCheckService= " + zwsCheckService);就比较清楚了。

Answer 7

 嗯  zwsCheckService 这个是空的 
  这是我在控制层里 写的  private ZwsCheckService zwsCheckService;public void setZwsCheckService(ZwsCheckService zwsCheckService) {
this.zwsCheckService = zwsCheckService;
}   
  调用 ZwsCheckService 里的方法 set方法也写了 怎么是空的呢

Answer 8

在zwsCheckService.saveZws(check);
前面加上System.out.println("zwsCheckService= " + zwsCheckService);
看看zwsCheckService是不是null