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《JSP网络开发实例自学手册》实例运行出错，请帮忙！
发表在JavaWeb图书答疑
2008-10-14
是否精华
是
否
版块置顶:
是
否
我使用《JSP网络开发实例自学手册》配套光盘的实例时出现以下错误，看不懂，请帮忙解决一下。
按照书上及程序的说明，安装配置好后，通过Tomcat Manager，选择/office，进入企业办公自动化系统登陆页面，输入用户名mr，密码mrsoft，点击确定出现以下错误页面：
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
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:710) javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
java.lang.NullPointerException com.office.dao.DB.getRs(DB.java:66) com.office.action.LogonAction.executeLogonNo(LogonAction.java:65) com.office.action.LogonAction.execute(LogonAction.java:29) 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:710) javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.
--------------------------------------------------------------------------------
Apache Tomcat/6.0.16
--------------------------------------------------------------------------------
按照书上及程序的说明，安装配置好后，通过Tomcat Manager，选择/office，进入企业办公自动化系统登陆页面，输入用户名mr，密码mrsoft，点击确定出现以下错误页面：
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
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:710) javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
java.lang.NullPointerException com.office.dao.DB.getRs(DB.java:66) com.office.action.LogonAction.executeLogonNo(LogonAction.java:65) com.office.action.LogonAction.execute(LogonAction.java:29) 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:710) javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.
--------------------------------------------------------------------------------
Apache Tomcat/6.0.16
--------------------------------------------------------------------------------
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