Amazon S3 issue in web applications

[Yohan Weerasinghe]

First, I made another post about this on SO, but ended up with no results - http://stackoverflow.com/questions/31176998/amazon-s3-issue-in-web-applications


Please have a look at the below code.

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package S3Test;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.s3.AmazonS3;
import com.amazonaws.services.s3.AmazonS3Client;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Yohan
 */
public class S3Test extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        PrintWriter writer = response.getWriter();
        System.out.println("I am in");
       
        String accessKey = "****************";
        String secretKey = "******************";

        AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);
        AmazonS3 conn = new AmazonS3Client(credentials);
        
        System.out.println("done");
        
//        List<Bucket> buckets = conn.listBuckets();
//for (Bucket bucket : buckets) {
//        System.out.println(bucket.getName() + "\t" +
//                StringUtils.fromDate(bucket.getCreationDate()));
//}
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

I am using this code to list the buckets I have in amazon s3. However this process is extremely slow, it takes almost 1 minute or more. Not only that, this takes lot of memory, almost freezing the Google Chrome. My bucket is in US standard region and my application is running in a PC located in south asia.

The delay is in connection configuration. I noticed this is not taking any time delays when it is running in non web java applications. I ran this in a simple `Main` class which is not web based, and it worked fine, fast.

I am using Netbeans IDE and the above code is a part of a servlet. The server I am using is apache tomcat 7.

Any ideas why this is taking this much of time? I added all the JAR files came with Amazon SDK for Java as well. It has no use to me if this takes this long.

[Karthik Shiraly]

As already pointed out in the SO thread, you are not writing any response back to the browser.
What are the timestamps of the console messages "I am in" and "done" when running as web app? Is their difference much higher compared to that in the console application?

[William Brogden]

You should build and test your S3 access in a separate class rather than in a servlet. Much easier to debug that way.

Bill

[Yohan Weerasinghe]

It doesn't matter that I am not writing back to the browser, because I can see what is happening in console and I do have set console messages. Regarding writing the s3 thing in another class and calling It via the servlet I have tried that thing too. It has the same situations as the thing what you can see here. I am wondering whether this is related to apache. I think this is either to relates to apache, localhost or xampp