Java开发网 - 求救 jsp+javabean

Topic: 求救 jsp+javabean

1.求救 jsp+javabean	Copy to clipboard
Posted by: jiangsu3000 Posted on: 2004-11-06 14:58 org.apache.jasper.JasperException: /guestbook/index.jsp(15,0) The value for the useBean class attribute guestbook.GuestBookJdbc is invalid. 是怎么了啊? 可以说的具体点没? 在线等 --------------------------谢谢

2.Re:求救 jsp+javabean [Re: jiangsu3000]	Copy to clipboard
Posted by: bluepure Posted on: 2004-11-06 18:49 GuestBookJdbc 改成 guestBookJdbc 。

3.Re:求救 jsp+javabean [Re: bluepure]

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Posted by: jiangsu3000
Posted on: 2004-11-06 19:03

没有用啊
抱的还是这个错误
怎么回事啊?`
org.apache.jasper.JasperException: /guestbook/index.jsp(15,0) The value for the useBean class attribute guestbook.GuestBookJdbc 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)

4.Re:求救 jsp+javabean [Re: jiangsu3000]	Copy to clipboard
Posted by: jiangsu3000 Posted on: 2004-11-06 20:14 =高手给个提示啊谢谢了

5.Re:求救 jsp+javabean [Re: jiangsu3000]

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Posted by: chengbd
Posted on: 2004-11-07 01:54

给个提示，就是静下心来，仔细调试！
每天都会遇到这样问问题的方式，俗话说“授之以鱼，不如授之以渔”，学习也应该是这样，不应该就问题而问问题，要学习一下解决问题的办法，别人能解决的，为什么自己就解决不了，不只是经验不足的原因吧？我想更多的是态度问题！
就拿楼主来说，您这是在问和javabean相关的东西了，简单我说这是基本的常识问题，您可能买些书，看看javabean的引用方法，自己来解决的，是吧？其次，您在这里是问和调试相关的问题了，为什么只提供出错信息，不提供到底是哪一句代码引发出错了，是不是没有定位出是哪一句出错？如果是这样，请您先想想调试定位的办法？　如果您知道是哪一句出错了，为什么不提供给大家呢，是你想的不周全吧？　大部分初级问题都是因为想的不周全而错的，但又不肯多想想，仔细查查，不是浪费时间吗？

一点感想，如有过份之处请见谅。

6.Re:求救 jsp+javabean [Re: jiangsu3000]

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Posted by: jiangsu3000
Posted on: 2004-11-07 07:56

sorry
初次提问
我现在发现可能是我的机器无法编译jsp吧
看看
我的环境 java_home:E:\j2sdk1.4.2\lib;.
path:%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;D:\kv;E:\j2sdk1.4.2\bin;E:\j2sdk1.4.2\lib;.
我的系统,j2sdk1.4.2和tomcat5都是装在e:/下的
为什么我调试jsp的时候出现
　type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to compile class for JSP
  org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:97)
  org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:346)
  org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:414)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
  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)

root cause

Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK
  org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java:106)
  org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:935)
  org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:764)
  org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:382)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
  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

7.Re:求救 jsp+javabean [Re: jiangsu3000]	Copy to clipboard
Posted by: chengbd Posted on: 2004-11-07 10:08 将JDK目录下的lib下的tools.jar复制到tomcat下的common\lib，重新启动tomcat试试

8.Re:求救 jsp+javabean [Re: jiangsu3000]	Copy to clipboard
Posted by: jiangsu3000 Posted on: 2004-11-07 17:55 可以了谢谢