關於hibernate 報 java.lang.IllegalArgumentException

JSP頁面報錯：

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

控制檯報錯信息：

 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：因爲數據庫定義了del_tag爲bit型，而且查詢時數據爲null，hibernate對應的類型是boolean，boolean不能爲空，給del_tag字段添加個0或者1就行了