java HTTP Status 500
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.myschool.util.DB.prepareStatement(DB.java:96)
com.myschool.teacher.dao.TeacherDAO.findTeacherByNumber(TeacherDAO.java:152)
com.myschool.teacher.dao.TeacherDAO.login(TeacherDAO.java:219)
com.myschool.common.servlet.LoginServlet.doPost(LoginServlet.java:79)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.myschool.common.servlet.EncodingFilter.doFilter(EncodingFilter.java:23)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.