关于问题：The value for the useBean class attribute test.textcounter is invalid.

kangsg219 2007-03-06 11:01:03

jsp初学者，我实在找不出错在哪。请牛人指点！！

pe Exception report

message

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

exception

org.apache.jasper.JasperException: /textcounter.jsp(9,0) The value for the useBean class attribute test.textcounter is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1200)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1155)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2386)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2392)
org.apache.jasper.compiler.Node$Root.accept(Node.java:489)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
org.apache.jasper.compiler.Generator.generate(Generator.java:3394)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:210)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:308)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.

...全文

620 9 打赏收藏转发到动态举报

写回复

用AI写文章

9 条回复

切换为时间正序

请发表友善的回复…

发表回复

真的很小奚 2007-03-07

打赏
举报

LZ程序文件在那无所谓的要得就是CLASS文件。恭喜LZ问题解决

jjoohhnn13 2007-03-06

打赏
举报

test/count目录下 textcounter.java 和textcounter.class
---------------------------------------------------------
你的JAVABEAN是放在 test/count目录下的
而你的调用JAVABEAN这样写<jsp:useBean id="textcounter" class="test.textcounter" scope="application" />当然找不到textcounter

把class="test.textcounter" 改成 class="test.count.textcounter"

真的很小奚 2007-03-06

打赏
举报

确认你的textcounter类放在什么地方了在写<jsp:useBean id="textcounter" class="test.count.textcounter" scope="application" />class=""里面要能找到textcounter。CLASS文件

真的很小奚 2007-03-06

打赏
举报

class="test.textcounter"下面有textcounter类吗？？你是package count;呀
<jsp:useBean id="textcounter" class="test.count.textcounter" scope="application" />

kangsg219 2007-03-06

打赏
举报

IE中输入http://localhost:8080/test/textcounter.jsp，出现上面的问题，
我感觉代码没有问题，是不是文件的存放路径有问题？还是缺什么支持？

kangsg219 2007-03-06

打赏
举报

test/count目录下 textcounter.java 和textcounter.class
package count;
import java.io.*;
public class textcounter
{ String currentrecord="";
BufferedReader bfr;
public String readfile (String path ,String files) throws FileNotFoundException
{ this.bfr=new BufferedReader (new FileReader(path+"\\"+files));
String returnstr="";
try{currentrecord=this.bfr.readLine();}
catch(IOException e ){e.printStackTrace();}
if(currentrecord==null)
{returnstr="0";}
else
{returnstr=currentrecord;}
return returnstr;
}
public void writefile(String path,String files,String counter) throws FileNotFoundException
{ int writestr=Integer.parseInt(counter)+1;
try{
PrintWriter pw=new PrintWriter(new FileOutputStream(path+"\\"+files));
pw.println(writestr);
pw.close(); }
catch(IOException e){throw new FileNotFoundException(e.getMessage());}
}
}

kangsg219 2007-03-06

打赏
举报

我用的是tomcat6 .
test目录下textcounter.jsp
<%@ page contentType="text/html;charset=GBK" language="java" %>
<html>
<head>
<title>文本在线计数器示例</title>
</head>
<body>
<center>
<h3>文本在线计数器示例<h3>
<jsp:useBean id="textcounter" class="test.textcounter" scope="application" />
<%
string path=application.getRealPath(this.getServletName());
path=path.substring(0,path.lastIndexOf("\\"));
string counter=textcounter.readfile(path,"counter.txt");
textcounter.writerfile(path,"counter.txt",counter);
counter=textcounter.readfile(path,"counter.txt");
%>
<p>您是第<%=counter%>位访问者</p>
</center>
</body>
</html>

kangsg219 2007-03-06

打赏
举报

问题解决了，是class文件的路径问题。

kangsg219 2007-03-06

打赏
举报

给位说的对啊，可是改了后还是有错：
ption report

message

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

exception

org.apache.jasper.JasperException: /textcounter.jsp(9,0) The value for the useBean class attribute test.count.textcounter is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1200)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1155)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2386)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2392)
org.apache.jasper.compiler.Node$Root.accept(Node.java:489)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
org.apache.jasper.compiler.Generator.generate(Generator.java:3394)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:210)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:308)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.