关于hibernate 报 java.lang.IllegalArgumentException

JSP页面报错：

Null value was assigned to a property of primitive type setter of com.founder.common.pojo.AskBuy.del_tag

控制台报错信息：

 Servlet.service() for servlet default threw exception
java.lang.IllegalArgumentException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

原因：因为数据库定义了del_tag为bit型，而且查询时数据为null，hibernate对应的类型是boolean，boolean不能为空，给del_tag字段添加个0或者1就行了