DWZ Spring MVC BindException求解救

[TheViki]

碰到这个问题好几天了，接连几个地方都有这样的错误。实在是没办法了望高手解救...

org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 3 errors
Field error in object 'materialSerial' on field 'amount': rejected value [1]; codes [methodInvocation.materialSerial.amount,methodInvocation.amount,methodInvocation.java.lang.String,methodInvocation]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [materialSerial.amount,amount]; arguments []; default message [amount]]; default message [Property 'amount' threw exception; nested exception is java.lang.NullPointerException]
Field error in object 'materialSerial' on field 'expirdate': rejected value [2014-03-03]; codes [methodInvocation.materialSerial.expirdate,methodInvocation.expirdate,methodInvocation.java.util.Date,methodInvocation]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [materialSerial.expirdate,expirdate]; arguments []; default message [expirdate]]; default message [Property 'expirdate' threw exception; nested exception is java.lang.NullPointerException]
Field error in object 'materialSerial' on field 'price': rejected value [1]; codes [methodInvocation.materialSerial.price,methodInvocation.price,methodInvocation.java.lang.String,methodInvocation]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [materialSerial.price,price]; arguments []; default message [price]]; default message [Property 'price' threw exception; nested exception is java.lang.NullPointerException]
	at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:111)
	at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:75)
	at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:156)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:117)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at dwz.adapter.web.filter.EncodingFilter.doFilter(EncodingFilter.java:30)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at dwz.adapter.web.filter.SiteMeshWrapperFilter.doFilter(SiteMeshWrapperFilter.java:20)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at dwz.adapter.web.filter.SessionValidateFilter.doFilter(SessionValidateFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at dwz.adapter.web.filter.EncodingFilter.doFilter(EncodingFilter.java:30)
	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:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)
	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:600)
	at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1703)
	at java.lang.Thread.run(Thread.java:619)

[Defonds]

materialSerial 的 amount、expirdate、price 赋值了没，不要置空

[TheViki]

Controller 里面的 方法是这样的

@RequestMapping(value = "/insert", method = RequestMethod.POST)
	public ModelAndView insert(MaterialSerial materialSerial) {
		materialSerialMgr.updMaterialSerial(materialSerial);
		return ajaxDoneSuccess(getMessage("msg.operation.success"));
	}

页面提交的字段没法映射到这个对象

[TheViki]

百度也看到了这种说法 说什么属性值没有赋值。不经意间看到了原来这个映射的对象没有实例化。问题已经解决。

[sogetsu]

楼主是如何解决的?请指教.?

[TheViki]

所映射的对象需要实例化才能使用。

[whybangbang]

咋个实例化啊

[wjmabc]

extends SimpleFormController并且覆盖 @InitBinder // protected void initBinder(HttpServletRequest request,ServletRequestDataBinder binder) throws Exception { // DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); // CustomDateEditor dateEditor = new CustomDateEditor(fmt, true); // binder.registerCustomEditor(Date.class, dateEditor); // super.initBinder(request, binder); // }