请高手帮忙看看，到底是什么问题（在线等待！！！）

写了一个类文件，读取指定目录下的文件列表，这个类文件单独编译没有问题，但是在调用的时候老是报下面的错误。
类文件：import java.io.File;
import java.util.Date;
import java.util.Iterator;
import java.util.Vector;public class FileViewer{
        File myDir;
        File[] contents;
        Vector vectorList;
        Iterator currentFileView;
        File currentFile;
        String path;
        
        public FileViewer(){
                path=new String("");                        
                vectorList=new Vector();
        }
        public FileViewer(String path){
                this.path=path;
                vectorList=new Vector();
        }        
        /**
         * 设置浏览的路径
        */
        public void setPath(String path){
                this.path=path;
        }
        
        /***
         * 返回当前目录路径
        */
        public String getDirectory(){
                return myDir.getPath();
        }
        
        /**
         * 刷新列表
        */
        public void refreshList(){
                if(this.path.equals("")) path="c:\\";
                myDir=new File(path);
                
                vectorList.clear();
                contents =myDir.listFiles();
                //重新装入路径下文件
                for(int i=0;i<contents.length;i++){
                        vectorList.add(contents[i]);
                }
                currentFileView=vectorList.iterator();
        }
        /**
         * 移动当前文件集合的指针指到下一个条目
         * @return 成功返回true,否则false
        */
        public boolean nextFile(){
                while(currentFileView.hasNext()){
                        currentFile=(File)currentFileView.next();
                        return true;
                }
                return false;
        }
        
        /**
         * 返回当前指向的文件对象的文件名称
        */
        public String getFileName(){
                return currentFile.getName();
        }
        
        
        /**
         * 返回当前指向的文件对象的文件尺寸
        */
        public String getFileSize(){
                return new Long(currentFile.length()).toString();
        }        /**
         * 返回当前指向的文件对象的最后修改日期
        */        
        public String getFileTimeStamp(){
                return new Date(currentFile.lastModified()).toString();
        }
        
        /**
         * 返回当前指向的文件对象是否是一个文件目录
        */
        public boolean getFileType(){
                return currentFile.isDirectory();
        }
}调用代码：<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %><html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>已有资源</title>
</head><body>
<p>电影列表</p>
<jsp:useBean  id="f"  class="FileViewer"  scope="page" />
<%   
                f.setPath("C:\\Tomcat 5.0\\webapps\\myapp\\yuletiandi\\dianyingwenjianjia");   //C:\\Tomcat 5.0\\webapps\\myapp\\yuletiandi\\dianyingwenjianjia
                f.refreshList();
                while(f.nextFile()){
                        System.out.print(f.getFileName());
                        if(!f.getFileType())
                                System.out.print("  "+f.getFileSize());
                        else
                                System.out.print("  <DIR>");
                        System.out.print(f.getFileTimeStamp()+"\n");
                }%><p>&nbsp; </p>
<p>&nbsp;</p>
</body>
</html>执行时候报如下错误：type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 11 in the jsp file: /yuletiandi/listdianying.jsp
Generated servlet error:
C:\Tomcat 5.0\work\Catalina\localhost\myapp\org\apache\jsp\yuletiandi\listdianying_jsp.java:53: cannot access org.apache.jsp.yuletiandi.FileViewer
An error occurred at line: 11 in the jsp file: /yuletiandi/listdianying.jsp
Generated servlet error:
bad class file: C:\Tomcat 5.0\work\Catalina\localhost\myapp\org\apache\jsp\yuletiandi\FileViewer.java
file does not contain class org.apache.jsp.yuletiandi.FileViewer
Please remove or make sure it appears in the correct subdirectory of the classpath.
      FileViewer f = null;
      ^
1 error org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:437)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:497)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:476)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:464)
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/5.0.30 logs.