Null value was assigned to a property of primitive type setter of XXX

在SpringMVC界面删除数据库表中字段的时候，出现报错如下：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.orm.hibernate3.HibernateSystemException:Null value was assigned to a property of primitive
type setter of com.xxx.CurrentData.accountAccumulateFlow; nested exception is org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of com.xxx.CurrentData.accountAccumulateFlow

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:948)

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)

at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

at com.xxx.web.filter.LoginFilter.doFilter(LoginFilter.java:65)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at com.xxx.security.SecurityInterceptorFilter.invoke(SecurityInterceptorFilter.java:52)

at com.xxx.security.SecurityInterceptorFilter.doFilter(SecurityInterceptorFilter.java:45)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:146)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)

解决方案：把实体类中的原始类型全部转化为包装类型

Java语言是一个面向对象的语言，但是Java中的基本数据类型却是不面向对象的，这在实际使用时存在很多的不便，为了解决这个不足，在设计类时为每个基本数据类型设计了一个对应的类进行代表，这样八个和基本数据类型对应的类统称为包装类(Wrapper
Class)，有些地方也翻译为外覆类或数据类型类。


包装类均位于java.lang包，包装类和基本数据类型的对应关系如下表所示：

包装类对应表

基本数据类型	包装类
byte	Byte
boolean	Boolean
short	Short
char	Character
int	Integer
long	Long
float	Float
double	Double

在这八个类名中，除了Integer和Character类以后，其它六个类的类名和基本数据类型一直，只是类名的第一个字母大写即可。


对于包装类说，这些类的用途主要包含两种：

a、作为和基本数据类型对应的类类型存在，方便涉及到对象的操作。

b、包含每种基本数据类型的相关属性如最大值、最小值等，以及相关的操作方法。