求大神看看这个是什么错误

[Jr_zi]

用tomcat
Exception report

message java.lang.NullPointerException

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.NullPointerException
com.wy.dao.GoodsDao.selectMark(GoodsDao.java:52)
org.apache.jsp.index_jsp._jspService(index_jsp.java:77)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.61 logs.

[执笔记忆的空白]

com.wy.dao.GoodsDao.selectMark(GoodsDao.java:52) 看看52行，那个对象为空了

[姜小白-]

引用 3 楼 shijing266 的回复:

com.wy.dao.GoodsDao.selectMark(GoodsDao.java:52) 看看52行，那个对象为空了

顶 大牛说的对

[tony4geek]

引用 4 楼 magi1201 的回复:

[quote=引用 3 楼 shijing266 的回复:] com.wy.dao.GoodsDao.selectMark(GoodsDao.java:52) 看看52行，那个对象为空了

顶 大牛说的对 [/quote]顶 大牛说的对

[奄灬苟且偷生]

org.apache.jsp.index.jsp 77行空指针异常(没值) javax.servlet.http.HttpServlet.service.HttpServlet.java 731行 空指针异常 (没值) 仔细看看是不是对没值的对象 进行取长度、还是什么？ 反正就是过分取值的问题

[benluobo]

GoodsDao.java:52

[tsshouhu]

java.lang.NullPointerException com.wy.dao.GoodsDao.selectMark(GoodsDao.java:52) 空指针异常 打个断点调试下

[zws_miss]

tomcat运行的时候 是不是有个jsp_api.jar ，把那个包去掉， 运行下试试

[mingdongwang]

引用

#5

顶，大牛说得对

[liguangwen86]

com.wy.dao.GoodsDao.selectMark(GoodsDao.java:52)