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分享关于问题：The value for the useBean class attribute test.textcounter is invalid.
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$Nodes.visit(Node.java:2336)
org.apache.jasper.compiler.Generator.generate(Generator.java:3394)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:210)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:308)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.
pe Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /textcounter.jsp(9,0) The value for the useBean class attribute test.textcounter is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$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.
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真的很小奚 2007-03-07
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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
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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"
---------------------------------------------------------
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
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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
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class="test.textcounter"下面有textcounter类吗？？你是package count;呀
<jsp:useBean id="textcounter" class="test.count.textcounter" scope="application" />
<jsp:useBean id="textcounter" class="test.count.textcounter" scope="application" />
kangsg219 2007-03-06
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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？
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
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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());}
}
}
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
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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>
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
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问题解决了，是class文件的路径问题。
kangsg219 2007-03-06
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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$Nodes.visit(Node.java:2336)
org.apache.jasper.compiler.Generator.generate(Generator.java:3394)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:210)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:308)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.
ption report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /textcounter.jsp(9,0) The value for the useBean class attribute test.count.textcounter is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$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.
