Hi in this code first I am downloading a web-page source code then I am storing the code in text file. Again I am reading that file and matching with the regex to search a specific string. There is no compiler error. Exception in thread "main" java.lang.NoClassDefFoundError: java/lang/CharSequence Can anybody tell me Where I am wrong.

import java.io.*;
import java.net.*;
import java.lang.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class WebDownload
{
  public void getWebsite()
   {
     try{
    URL url=new URL("www.gmail.com");// any URL can be given
    URLConnection urlc=url.openConnection();
    BufferedInputStream buffer=new BufferedInputStream(urlc.getInputStream());
    StringBuffer builder=new StringBuffer();
    int byteRead;
    FileOutputStream fout;
    StringBuffer contentBuf = new StringBuffer();

    while((byteRead=buffer.read())  !=-1)
    {

        builder.append((char)byteRead);



         fout = new FileOutputStream ("myfile3.txt");


            new PrintStream(fout).println (builder.toString());

            fout.close();   


    } 
    BufferedReader in = new BufferedReader(new FileReader("myfile3.txt"));
String buf = null;
while ((buf = in.readLine()) != null) {
 contentBuf.append(buf);contentBuf.append("\n");
}
in.close();
Pattern p = Pattern.compile("<div class=\"summarycount\">([^<]*)</div>");
Matcher matcher = p.matcher(contentBuf);
 if(matcher.find())
     {
    System.out.println(matcher.group(1));
     }
  else

     System.out.println("could not find");
  }
     catch(MalformedURLException ex) {
    ex.printStackTrace();
    }
    catch(IOException ex){
      ex.printStackTrace();
     }



  }
  public static void main(String [] args)
   {
     WebDownload web=new WebDownload();
   web.getWebsite();
  }
}