Renders the image dynamically in CQ5

import java.awt.Dimension;
import java.io.IOException;

import javax.jcr.Node;
import javax.jcr.PathNotFoundException;
import javax.jcr.Property;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.servlet.ServletException;

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.day.cq.commons.ImageHelper;
import com.day.image.Layer;

/**
 * Renders the image dynamically
 * Usage: /content/geometrixx/en/products/circle.thumbnail.500.500.jpg
 */
@Component
@Service
@org.apache.felix.scr.annotations.Properties({
      @org.apache.felix.scr.annotations.Property(name="sling.servlet.resourceTypes", value="sling/servlet/default"),
      @org.apache.felix.scr.annotations.Property(name="sling.servlet.selectors", value={"resize","thumb","thumbnail"}),
      @org.apache.felix.scr.annotations.Property(name="sling.servlet.extensions", value={"jpg", "png", "gif"}),
      @org.apache.felix.scr.annotations.Property(name="sling.servlet.methods", value="GET")
})
public class CustomThumbnailServlet extends SlingSafeMethodsServlet {

private static final long serialVersionUID = 1L;
private final Logger log = LoggerFactory.getLogger(this.getClass());

private final String ORIGINAL_PATH = "/jcr:content/renditions/original/jcr:content";
private static final Dimension DEFAULT_DIMENSION = new Dimension(100, 100);

@Override
protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException{
try {
 String[] selectors = request.getRequestPathInfo().getSelectors();
 String extension = request.getRequestPathInfo().getExtension();
 String imagePath = request.getRequestPathInfo().getResourcePath().substring(0, request.getRequestPathInfo().getResourcePath().indexOf("."));
 int maxHeight = selectors.length > 1 ? Integer.valueOf(selectors[1]).intValue() : (int)DEFAULT_DIMENSION.getHeight();
 int maxWidth = selectors.length > 2 ? Integer.valueOf(selectors[2]).intValue() : (int)DEFAULT_DIMENSION.getWidth();  
 boolean margin = (selectors.length > 3) && (selectors[3].equals("margin"));

 Session session = (Session)request.getResourceResolver().adaptTo(Session.class);
 Node imageNode = session.getNode(imagePath+"."+extension+ORIGINAL_PATH);

 Property data = imageNode.getProperty("jcr:data");
     Layer imageLayer = ImageHelper.createLayer(imageNode.getSession(), imageNode.getPath());
 imageLayer.resize(maxWidth, maxHeight);

 response.setContentLength((int)data.getLength());
 response.setContentType(imageLayer.getMimeType());
 imageLayer.write(imageLayer.getMimeType(), imageLayer.getMimeType().equals("image/gif") ? 255 : 1.0, response.getOutputStream());

} catch (PathNotFoundException e) {
e.printStackTrace();
} catch (RepositoryException e) {
e.printStackTrace();
}  
 }
}