我是新手,谁可以告诉我,为什么会产生这个错误吗?
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 acec.dbConn.executeQuery(dbConn.java:77) acec.LoginCheck.doGet(LoginCheck.java:34) acec.LoginCheck.doPost(LoginCheck.java:54) javax.servlet.http.HttpServlet.service(HttpServlet.java:709) javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.