I know this question has been asked a lot of times, but so far, none of the answers previously given have worked for me, here is my code:
<html>
  <head>
    <title>Programa</title>
  </head>
  <body>
    <div>
      Introduzca una palabra a buscar:
      <input type="text" id="INPUT">
      <%@ page import="java.net.URL" %>
      <%@ page import="com.google.gson.*" %>
      <%@ page import="java.net.URLEncoder" %>
      <%@ page import="java.io.InputStreamReader" %>
      <%@ page import="java.io.InputStream" %>
      <%@ page import="java.io.Reader" %>
      <%@ page import="javax.swing.*" %>
      <%@ page import="java.awt.event.*;" %>
      <%!
      int min(int a,int b) {
          return (a>b)? b:a;
      }
      int edit_distance(String a,String b) {
          int n = a.length(), m = b.length(),costo;
          int[][] mat = new int[n+1][m+1];
          for(int i=0;i<=n;++i) mat[i][0] = i;
          for(int j=0;j<=m;++j) mat[0][j] = j;
          for(int i=1;i<=n;++i) {
            for(int j=1;j<=m;++j) {
              costo = a.charAt(i-1) == b.charAt(j-1)? 1 : 0;
              mat[i][j] = min(min(mat[i-1][j] + 1,mat[i-1][j-1] + costo),mat[i][j-1] + 1);
            }
          }
          return mat[n][m];
      }
      String resultados_de_la_busqueda(String search) { //Básicamente lo que hace esta función es devolverte una cadena con los resultados de la búsqueda
          StringBuffer RES = new StringBuffer("<html>");
          String google = "http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q="; //El enlace para buscar en google
          String charset = "UTF-8";
          URL url;
          Reader reader;
          try {
            url = new URL(google + URLEncoder.encode(search, charset));
            try {
              reader = new InputStreamReader(url.openStream(), charset);
              GoogleResults results = new Gson().fromJson(reader, GoogleResults.class);
              for(int i=0;i<3;++i) {
                RES.append(results.getResponseData().getResults().get(i).getTitle());
                RES.append("<br/>");
                RES.append("<a href=\"");
                RES.append(results.getResponseData().getResults().get(i).getUrl());
                RES.append("\">" + results.getResponseData().getResults().get(i).getUrl() + "</a>");
                RES.append("<br/><br/>");
              }
            } catch(Exception e) {}
          } catch(Exception e) {}
          return RES.toString();
      }
      %>
      <%
      //Se supone que acá debo mostrar el resultado de la búsqueda...
      out.println(resultados_de_la_busqueda("taringa"));
      %>
    </div>
  </body>
</html>
And here is the error I'm getting:
org.apache.jasper.JasperException: No se puede compilar la clase para JSP: 
Ha tenido lugar un error en la línea: 47 en el archivo jsp: /Programa.jsp
GoogleResults cannot be resolved to a type
Gson cannot be resolved to a type
Any idea on what is causing the problem?
Edit 1:
This is the GoogleResults class:
import java.util.List;
public class GoogleResults {
  private ResponseData responseData;
  public ResponseData getResponseData() { return responseData; }
  public void setResponseData(ResponseData responseData) { this.responseData = responseData; }
  public String toString() { return "ResponseData[" + responseData + "]"; }
  static class ResponseData {
    private List<Result> results;
    public List<Result> getResults() { return results; }
    public void setResults(List<Result> results) { this.results = results; }
    public String toString() { return "Results[" + results + "]"; }
  }
  static class Result {
    private String url;
    private String title;
    public String getUrl() { return url; }
    public String getTitle() { return title; }
    public void setUrl(String url) { this.url = url; }
    public void setTitle(String title) { this.title = title; }
    public String toString() { return "Result[url:" + url +",title:" + title + "]"; }
  }
}
 
     
     
     
     
     
    