test: use annotation to simplify register servlet

vul/vul-webapp-jakarta/src/main/java/jakarta/UploadServlet.java

@@ -2,6 +2,7 @@ package jakarta;
 
 import jakarta.servlet.ServletException;
 import jakarta.servlet.annotation.MultipartConfig;
+import jakarta.servlet.annotation.WebServlet;
 import jakarta.servlet.http.HttpServlet;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
@@ -22,6 +23,7 @@ import java.nio.file.Files;
         maxFileSize = 1024 * 1024 * 5,
         maxRequestSize = 1024 * 1024 * 5 * 5
 )
+@WebServlet("/upload")
 public class UploadServlet extends HttpServlet {
 
     private static final String UPLOAD_DIRECTORY = "/";