DWZ Spring MVC BindException求解救

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)