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jsp数据库系统开发案例精选第3章的问题
发表在JavaWeb图书答疑
2008-04-22
是否精华
是
否
版块置顶:
是
否
<PRE>java.lang.NullPointerException
com.dao.UserDaoImpl.checkUser(UserDaoImpl.java:35)
com.service.UserFacadeImpl.checkUser(UserFacadeImpl.java:28)
com.webtier.manager.UserCheck.perform(UserCheck.java:30)
org.apache.struts.action.ActionServlet.processActionPerform(ActionServlet.java:1787)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1586)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
</PRE>
com.dao.UserDaoImpl.checkUser(UserDaoImpl.java:35)
com.service.UserFacadeImpl.checkUser(UserFacadeImpl.java:28)
com.webtier.manager.UserCheck.perform(UserCheck.java:30)
org.apache.struts.action.ActionServlet.processActionPerform(ActionServlet.java:1787)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1586)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:510)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
</PRE>
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