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Tomcat的问题：JDK+TOMCAT设置好后，登陆系统，就有错！代码无问题！错误信息如下！
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /bookshop/login.jsp(3,0) The value for the useBean class attribute bookshop.run.login is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:150)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1227)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Generator.generate(Generator.java:3272)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:244)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:470)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /bookshop/login.jsp(3,0) The value for the useBean class attribute bookshop.run.login is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:150)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1227)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Generator.generate(Generator.java:3272)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:244)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:470)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
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.
--------------------------------------------------------------------------------
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kingofhawks 2005-06-09
java.lang.NullPointerException
bookshop.run.login.excute(login.java:65)
那边出exception了呀,看看代码呢
bookshop.run.login.excute(login.java:65)
那边出exception了呀,看看代码呢
syhgxyhzb 2005-06-09
不用谢
yangbiao 2005-06-09
分给你吧！下次再找你！谢谢你了这次！！！
syhgxyhzb 2005-06-09
有机会再说吧，这个不是我电脑我也没办法测试
yangbiao 2005-06-09
页面上有输入框，我按照密码提示进去。就出现了上面的新问题！！！
yangbiao 2005-06-09
能进index.jsp 但是一登陆就显示上面的错误！！！奇怪了！！
syhgxyhzb 2005-06-09
旧问题解决了，又出来新问题了，这个电脑不是我的，所以说着上边没有tomcat和jdk，没有办法帮你测试了，你这个是点击什么出来的问题？登录时候出现的问题吗？
yangbiao 2005-06-09
变成了这个错误！！！
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.lang.NullPointerException
bookshop.run.login.excute(login.java:65)
org.apache.jsp.bookshop.login_jsp._jspService(login_jsp.java:71)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
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.
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.lang.NullPointerException
bookshop.run.login.excute(login.java:65)
org.apache.jsp.bookshop.login_jsp._jspService(login_jsp.java:71)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
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.
yangbiao 2005-06-09
谢谢，剑雨飞花！
我在线等着你！！！
解决问题，立马给你分！决不食言！谢谢！这个问题困扰我很久了！
我在线等着你！！！
解决问题，立马给你分！决不食言！谢谢！这个问题困扰我很久了！
syhgxyhzb 2005-06-09
在你的WEB－INF目录中建立classes目录，然后把bookshop文件夹拷贝到classes目录中，这个问题就解决了
syhgxyhzb 2005-06-09
等一下，我帮你看看
yangbiao 2005-06-09
TO:syhgxyhzb(剑雨飞花)
是的，说的是的。我是看那本书！兄台：怎么解决？？？
是的，说的是的。我是看那本书！兄台：怎么解决？？？
syhgxyhzb 2005-06-09
你的javabean目录设置错了，你是不是看的飞思的那本jsp数据库开发实例精粹？那本书上设置的目录有点问题。
kingofhawks 2005-06-09
/bookshop/login.jsp(3,0) The value for the useBean class attribute bookshop.run.login is invalid.
把你的代码贴出来looklook
把你的代码贴出来looklook
fashchina 2005-06-09
对,应该是这个了,错误都告诉你了
tom2005 2005-06-09
放的位置有问题
jspxnet 2005-06-09
80％ 是你配置的问题
20％ 是你代码的问题
反正都是你的问题 ：）
class attribute bookshop.run.login is invalid.
20％ 是你代码的问题
反正都是你的问题 ：）
class attribute bookshop.run.login is invalid.