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JavaWeb开发典型模块大全 第三章第一个登录模块出错是啥原因?!
发表在Java图书答疑
2010-03-31
是否精华
是
否
版块置顶:
是
否
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
com.wy.tools.JDBConnection.executeQuery(JDBConnection.java:57)
com.wy.dao.UserInfoDao.queryUserInfo(UserInfoDao.java:51)
com.wy.servlet.UserInfoServlet.checkAccount(UserInfoServlet.java:150)
com.wy.servlet.UserInfoServlet.doPost(UserInfoServlet.java:33)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.20 logs.
--------------------------------------------------------------------------------
Apache Tomcat/6.0.20
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
com.wy.tools.JDBConnection.executeQuery(JDBConnection.java:57)
com.wy.dao.UserInfoDao.queryUserInfo(UserInfoDao.java:51)
com.wy.servlet.UserInfoServlet.checkAccount(UserInfoServlet.java:150)
com.wy.servlet.UserInfoServlet.doPost(UserInfoServlet.java:33)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.20 logs.
--------------------------------------------------------------------------------
Apache Tomcat/6.0.20
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