用jspSmartUpload组件上传初始化出错，高分求解

给你段代码自己分析
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.jspsmart.upload.*;public class servletUpload extends HttpServlet {

private ServletConfig config;
/**
* Init the servlet
*/
final public void init(ServletConfig config) throws ServletException {
this.config = config;
}

final public ServletConfig getServletConfig() {
return config;
}
/**
* Handles GET requests
*/
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("<BODY BGCOLOR='white'>");
out.println("<H1>jspSmartUpload : Servlet Sample</H1>");
out.println("<HR><BR>");
out.println("The method of the HTML form must be POST.");
out.println("</BODY>");
out.println("</HTML>");
}

/**
* Handles POST requests
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("<BODY BGCOLOR='white'>");
out.println("<H1>jspSmartUpload : Servlet Sample</H1>");
out.println("<HR>"); // Variables
int count=0;
SmartUpload mySmartUpload = new SmartUpload(); try {
// Initialization
mySmartUpload.initialize(config,request,response); // Upload
mySmartUpload.upload(); // Save the file with the original name
// in a virtual path of the web server
count = mySmartUpload.save(mySmartUpload.getRequest().getParameter("PATH"));

// Display the result
out.println(count + " file uploaded."); } catch (Exception e){
out.println("Unable to upload the file.<br>");
out.println("Error : " + e.toString());
}

out.println("</BODY>");
out.println("</HTML>");
          }
/**
* Destroy the servlet
*/
public void  destroy () {
}} 
注意前面的ServletConfig config;