dogan kaya berktas » english

Google Apps Mail Setup on eapps.com

dkberktas — Tue, 04 May 2010 03:34:07 +0000

For our last project Remotespots (which is an online click analysis tool), we chose eApps as the virtual hosting solution which is so far very good indeed. For mail server, since we trust the big brother Google, we use Google apps. Following is the simple steps for setting up the Google Apps Mail on eApps. (by the way, this is the case if you let eApps machine as your DNS server.)

A simple process as it should be but still worth documenting,

Register an Standard Google Apps account (so far this version is enough for our needs)
Open eapps control panel and go to system tab

Scroll down to All My Domains and select it
Here you will see the domains that you added, select the one that you want to add mail functionality.

Delete the existing MX records
Add the ones Google Apps ask as the following (leave the first field empty!)

And of course give some time for the propagation of the new MX records to all caches on planet earth!

Using Twitter oauth on GAE/J

dkberktas — Mon, 25 Jan 2010 23:22:03 +0000

Twitter supports oauth and there are many libraries for it, for Java(twitter4J)(oauth-signpost), most of the time you see examples of a desktop version, so it can take time to implement it on a web application (it did take time for my case).

Step 1. Get a Twitter account and create a Twitter application from http://twitter.com/apps (don’t forget to check in browser and enter a valid callback url.

Step 2. Download twitter4J add the library (in my case twitter4j-core-2.1.1-SNAPSHOT.jar) to project and update classpath

Step 3. Create a web application (I assume you have the Google plugin for Eclipse )

Step 4. Add the following servlets and update your web.xml. First servlet will handle login part. It will create a RequestToken which will create the magical aggrements between the consumer(your application) and provider(twitter). First servlet save the token and secret token since we will need them later.

String token = requestToken.getToken();
String tokenSecret = requestToken.getTokenSecret();

Step 5. You forget to update web.xml didn’t you, update the web.xml

Step 6. Enable session by adding

    true

to appengine-web.xml.

You can see my version from http://90.latest.denemekaya.appspot.com/login

ps. don’t forget to set the callback in Twittter to the url of the servlet for callback.

Links:

http://www.pakzilla.com/2009/10/03/tutorial-java-based-twitter-app-on-google-app-engine/
Explain the same procedure with Grails — http://blogs.bytecode.com.au/glen/2009/12/08/log-into-your-grails-app-using-your-twitter-credentials.html

A Simple Chart for a GWT Application on GAE/J

dkberktas — Sat, 19 Dec 2009 02:41:17 +0000

I am trying charting solutions for a GWT project and gchart seems a nice one. After some digging I create a sample project which is hosted on Google App Engine (GAE) demo. Source code is at Google project

The chart will show the remaining number of months in the current year.

First download the jar from the project home page http://code.google.com/p/gchart/
Put it under war/WEB-INF/lib and add the gchart.jar to your classpath
Create a Web Application project called it GChart-samples (I assume you have Google Eclipse Plugin and follow the basic steps from here)
This step is for make-up, find GChart_samples.html under war/WEB-INF and clear the part between tags.
Open GChart_samples.gwt.xml and add the following line

Create a class in client folder called FirstChart and change it as the following

package com.dogan.kaya.client;

import com.googlecode.gchart.client.GChart;

public class FirstChart extends GChart
{
	public FirstChart()
	{
		setChartSize(350, 350);

		addCurve();

		int[] data = { 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 };
		for (int i = 0; i < data.length; i++)
		{
			getCurve().addPoint(i + 1, data[i]);
		}
		//curve customization
		getCurve().getSymbol().setHeight(10);
		getCurve().getSymbol().setWidth(10);
		getCurve().getSymbol().setBorderColor("black");
		getCurve().getSymbol().setBorderWidth(3);
		getCurve().getSymbol().setSymbolType(SymbolType.LINE);
		getCurve().getSymbol().setFillThickness(2);
		getCurve().getSymbol().setFillSpacing(0);
		//chart customization
		getXAxis().setAxisMin(1);
		getXAxis().setAxisMax(12);
		getXAxis().setTickCount(12);
		getXAxis().setHasGridlines(false);
		getXAxis().setTickLocation(TickLocation.CENTERED);
		getXAxis().setTickLabelFontSize(10);
		getYAxis().setAxisMin(0);
		getYAxis().setAxisMax(12);
		//to get inteter values on y axis, be careful
		//about the number of intervals it can be tricky
		getYAxis().setTickCount(13);
		getYAxis().setTicksPerLabel(2);
		getYAxis().setHasGridlines(false);
		getYAxis().setTickLabelFontSize(10);
		//
		update();
	}
}

Open GChart_samples class and change it like the following

package com.dogan.kaya.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;

public class GChart_samples implements EntryPoint
{
	public void onModuleLoad()
	{
		RootPanel.get().add(new FirstChart());
	}
}

My output is sth like that

ps:

some nice links about gchart are as follows:

gchart homepage
A simple tutorial at http://whatwouldnickdo.com/wordpress/264/simple-charts-in-gwt-with-gchart/

Back to basics — A simple beginning to Grails

dkberktas — Fri, 11 Dec 2009 03:50:15 +0000

I guess I can finally finish my search for a good server side companion (at least for now). A couple years ago RIFE was my only choice but unfortunately, it didn’t work out well as I expected (RIFE is an open source project but partly because of developers like me who uses the framework but doesn’t pay his gratitude by adding sth to it, RIFE for the time being a dead project (at least for me!))

Anyway, for some time I consider turn back to good old J2EE, then wander on the land of some other Java enterprise frameworks (Spring MVC, Wicket, Struts 2, Hibernate etc ) then Google App engine Java with its in progress full stack framework like environment. Then I decide that all the ones mentioned above has steep learning curves and without feeling complely comfortable with them, It is imposible to develop sth quickly.

Then the obvious direction was rails. First give a try to Django, then read some about RoR but both of them somehow scare me out. I need to learn a new language (which Django tutorial specificly warns about looking a good python tutorial before devlde into Django), on the other hand, Grails (my love!) just start the sentence with “don’t worry about the groovy, you can learn it along the way”.

Obviously, Grails is relatively new compared to two other alternative and it has (or used to have) to many bugs for a relaible product.

But trust me, it is easy to just start and kick the first alfa version of sth out is a joy.

–

Ok this post is suppose to be a yet another introduction to Grails tutorial, so…

Steps to Get Started

1. install Grails (there is nothing I can add here — http://www.grails.org/Installation)

2. open command line and create a project with grails create-app Yeap

3. Go to the created directory cd Yeap

4. Type grails run-app

That’s it!

I’m currently using Apache Shiro plugin (previously JSecurity), Gwt plugin, Postgresql, Eclipse for the development, More posts related to these will be here soon (I hope)