最新回答 / 慕田峪0914232
这个我试过。如果用list可以通过泛型控制list的type,然后放入session,通过el的session域.名字就OK,如果用map写session貌似就比较麻烦了,session的val对应map的val,最重要的是取值就不好取了,要对应map
2017-04-27
求指点,执行了在页面报空指针异常
java.lang.NullPointerException
dao.MessageDao.queryMessageList(MessageDao.java:27)
service.ListService.queryMessageList(ListService.java:15)
servlet.ListServlet.doGet(ListServlet.java:32)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
java.lang.NullPointerException
dao.MessageDao.queryMessageList(MessageDao.java:27)
service.ListService.queryMessageList(ListService.java:15)
servlet.ListServlet.doGet(ListServlet.java:32)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
2017-04-27
!!!!!!Message.xml后面那些删除添加用不到的一定要注释掉,不然的话会报错
Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException:
Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException:
2017-04-27