Comments on: Google App Engine For Java – Microblogging Case Study

By: robertjmiller

robertjmiller — Tue, 23 Jun 2009 21:43:39 +0000

Thanks for the suggestions. I programmed with Ruby on Rails for 2 years and really enjoyed it but have yet to try Grails. With Grails on GAE, it sounds like now is the time to start.

By: cmhwebster

cmhwebster — Sun, 21 Jun 2009 10:40:07 +0000

Couple of quick points:

Be careful when creating your apps, as you can only have up to 10, and you cannot delete an app.

You can use Google App Engine with a Google Apps account to link your app to your own domain. This also allows you to restrict access to the app to authenticated users within your own domain (http://code.google.com/appengine/articles/auth.html).

By: cmhwebster

cmhwebster — Sun, 21 Jun 2009 10:35:33 +0000

Interesting article. It’s also worth pointing out that the latest version of Grails now runs on Google AppEngine (see http://www.springsource.org/node/1471 ). This should further encourage the choice of Java (with Grails) over Ruby/Rails.

By: united-coders.com

united-coders.com — Thu, 18 Jun 2009 14:44:23 +0000

Running a Java Wicket Application in the Google App Engine…

The Google App Engine (GAE) is a wonderful playground for your apps, especially when you have no server at hand. It gives you everything you need for free, up to a certain limit. As I happened to be a Java developer it became really interesting when th…

By: Nicolas Frankel

Nicolas Frankel — Mon, 15 Jun 2009 19:49:20 +0000

FYI, JPA is also available for persistence along JDO in Google App Engine. Since I’m not a JDO guru (just like you) I prefered using JPA. Although much less documented, it works, at least for common cases.

I’ve written a fairly long article on my own experience with Google App Engine. You can see it here: http://blog.frankel.ch/tech/dev/java/jee/google-appengine-limitations.

Best of luck.

By: robertjmiller

robertjmiller — Mon, 15 Jun 2009 15:52:33 +0000

Matt, good questions. I haven’t spent much time on it but have yet to figure out how to pre-load sample data. In development, I load data by manually testing my service from a browser. I use Fitnesse to automate tests but it would also work for loading data too (via automated form submissions).

The Google App Engine administration web site includes a “Data Viewer” that allows you to query and delete your production data but does not allow you to insert or update data. A “database migration” tool similar to what Ruby on Rails provides would be ideal.

By: Matt

Matt — Mon, 15 Jun 2009 15:37:12 +0000

How do you pre-load sample data? What do you do if you want to do a production change of data? I am curious. Good article, thanks. I would like to read more when you have it.

By: robertjmiller

robertjmiller — Mon, 15 Jun 2009 03:48:47 +0000

Florin, I did not have to pay for a standard edition Google Apps account (i.e., to associate my domain) because my company does not have that many employees and, thus, does not require the Google Apps “premier edition”. There may be other reasons that force you to buy a premier account but I can’t remember what they are.

By: florin

florin — Mon, 15 Jun 2009 03:19:32 +0000

By default, an application is deployed with a domain of something.appspot.com. A free Google Apps account is required to associate your custom domain to your application.”\

Last time I checked pay was required for this feature.