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《JSP项目开发案例全程实录》第六章办公自动化系统点击登录后运行抛出异常
发表在JavaWeb图书答疑
2012-12-07
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《JSP项目开发案例全程实录》第六章办公自动化系统,按照光盘使用说明书操作后,能访问首页登录页面,输入数据库中的用户名后,点击登录,出现如下报错,请问怎么回事,如何解决?黑体为浏览器报错信息。
[strong]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:545)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:486)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.struts.filter.MyFilter.doFilter(MyFilter.java:15)
root cause
java.lang.NullPointerException
com.hiernate.util.HibernateUtil.findUser(HibernateUtil.java:27)
com.struts.action.FindUserAction.finUser(FindUserAction.java:23)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)
org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:216)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.struts.filter.MyFilter.doFilter(MyFilter.java:15)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.36 logs.
--------------------------------------------------------------------------------
Apache Tomcat/6.0.36[/strong]
2. 另外光盘下的该项目,我想在myeclips中导入,选择已存在的项目文件后,不能进行导入操作,myeclipse不识别该项目,请问如何导入,详细步骤!
[strong]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:545)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:486)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.struts.filter.MyFilter.doFilter(MyFilter.java:15)
root cause
java.lang.NullPointerException
com.hiernate.util.HibernateUtil.findUser(HibernateUtil.java:27)
com.struts.action.FindUserAction.finUser(FindUserAction.java:23)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)
org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:216)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.struts.filter.MyFilter.doFilter(MyFilter.java:15)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.36 logs.
--------------------------------------------------------------------------------
Apache Tomcat/6.0.36[/strong]
2. 另外光盘下的该项目,我想在myeclips中导入,选择已存在的项目文件后,不能进行导入操作,myeclipse不识别该项目,请问如何导入,详细步骤!