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JSP项目开发实例企业快信系统不能登录问题
发表在JavaWeb图书答疑
2013-06-06
是否精华
是
否
版块置顶:
是
否
我下载了光盘里的代码，电脑上安装了SQL Server2005数据库，Tomcat7服务器，JDK1.6的环境，在登录页面输入用户名和密码后，点确定，就出错，错误提示为
HTTP Status 500 - java.lang.NullPointerException
type Exception report
message java.lang.NullPointerException
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: java.lang.NullPointerException
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
java.lang.NullPointerException
com.wgh.core.ConnDB.executeQuery(ConnDB.java:58)
com.wgh.dao.ManagerDAO.checkManager(ManagerDAO.java:15)
com.wgh.action.Manager.managerLogin(Manager.java:48)
com.wgh.action.Manager.execute(Manager.java:23)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.35 logs.
Apache Tomcat/7.0.35
请问是怎么回事，谢谢！
HTTP Status 500 - java.lang.NullPointerException
type Exception report
message java.lang.NullPointerException
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: java.lang.NullPointerException
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
java.lang.NullPointerException
com.wgh.core.ConnDB.executeQuery(ConnDB.java:58)
com.wgh.dao.ManagerDAO.checkManager(ManagerDAO.java:15)
com.wgh.action.Manager.managerLogin(Manager.java:48)
com.wgh.action.Manager.execute(Manager.java:23)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.35 logs.
Apache Tomcat/7.0.35
请问是怎么回事，谢谢！
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