HTTP Status 500 - type Exception reportmessagedescriptionThe server encountered an internal error () that prevented it from fulfilling this request.exceptionjava.lang.NullPointerExceptioncom.ascent.dao.LoginDAO.login(LoginDAO.java:27) com.ascent.serv

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HTTP Status 500 - type Exception reportmessagedescriptionThe server encountered an internal error () that prevented it from fulfilling this request.exceptionjava.lang.NullPointerExceptioncom.ascent.dao.LoginDAO.login(LoginDAO.java:27) com.ascent.serv
HTTP Status 500 -
type Exception report
message
descriptionThe server encountered an internal error () that prevented it from fulfilling this request.
exceptionjava.lang.NullPointerException
com.ascent.dao.LoginDAO.login(LoginDAO.java:27)
com.ascent.servlet.LoginServlet.Userlogin(LoginServlet.java:73)
com.ascent.servlet.LoginServlet.doGet(LoginServlet.java:42)
com.ascent.servlet.LoginServlet.doPost(LoginServlet.java:31)
javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
com.ascent.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:33)
noteThe full stack trace of the root cause is available in the Apache Tomcat/7.0.16 logs.Apache Tomcat/7.0.16

HTTP Status 500 - type Exception reportmessagedescriptionThe server encountered an internal error () that prevented it from fulfilling this request.exceptionjava.lang.NullPointerExceptioncom.ascent.dao.LoginDAO.login(LoginDAO.java:27) com.ascent.serv
服务器端应用程序出错,具体出错位置是LoginDao第27行代码附近,错误原因是空指针异常,原因是27行某一个对象未进行初始化

HTTP Status 500 - 急 HTTP Status 500 - 我刚开始学jsp 请问：HTTP Status 500 - 出现问题的页面提示如下：HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server HTTP Status 500 - 如何处理好麻烦,总出现,还有, HTTP Status 500 - 如何解决HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling thi HTTP Status 500 错误HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this reques http status 500 是什么错误HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling th HTTP Status 404 - / 是什么错误呀这是什么错,如何改呀,帮我改成功可以给你500积分 HTTP Status 404 - /BookStore--------------------------------------------------------------------------------type Status reportmessage /BookStoredescription The requested resource (/BookStore) is not available.----------------------------------------- HTTP Status 503 - This application is not currently available HTTP Status 403 - request denied!illegal user request什么意思 Status Status status status 英语翻译HTTP Status 500 - ________________________________________type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException:Cannot HTTP Status 404 - /lib/--------------------------------------------------------------------------------type Status reportmessage /lib/description The requested resource (/lib/) is not available.这是什么错误? JSP页面报错,HTTP Status 503 - This application is not currently available 英语翻译This is an HTTP status line.Every HTTP response starts with a status line.The status line consists of the HTTP version,a status code,and a reason phrase.The HTTP response code 200 means everything was fine; that is why Tomcatincluded the