Category Archives: Web

Where are the vogella example projects at Github?

Posted on June 18, 2015 by Lars Vogel

On a regular basis I get the question where people can find the example code of our tutorials. There are on Github but Github is big, so we created this vogella Source code page to make it easier to find … Continue reading →

Posted in Android, Eclipse, vogella, Web | Comments Off on Where are the vogella example projects at Github?

Google App Engine and sending Emails

Posted on February 3, 2011 by Lars Vogel

One of the nice things in the Google App Engine is that is it very easy to work with emails. You can send out and receive emails in your servlets. Lets demonstrate this by defining an application which allows the … Continue reading →

Posted in Web | Tagged , | 3 Comments

Google App Engine and JPA

Posted on January 10, 2011 by Lars Vogel

Using JPA on the Google AppEngine is straight forward. For some reason the documentation on the official Google App Engine side is not very easy to read therefore a little example here. Create a new web project “de.vogella.gae.persistence.jpa”. Change the … Continue reading →

Posted in Web | Tagged , , | 2 Comments

Build a “Management” Chat Bot in 5 steps with Google AppEngine

Posted on December 16, 2010 by Lars Vogel

Google AppEngine provides very cool features. One of these features is the XMPP API, that allows you to write apps that can interact with users through XMPP clients, e.g. Jabber or GTalk. Here’s a quick description how to create a … Continue reading →

Posted in Web | Tagged , | 1 Comment

Integration of SAP with the Google App Engine

Posted on November 22, 2010 by Lars Vogel

Recently I though how I could integrate an SAP System which tends to be in a closed firewall where no access it granded from the outsite. The solution is actually quite easy. You can easily send our HTTP requests from … Continue reading →

Posted in Web | Tagged | Comments Off on Integration of SAP with the Google App Engine

Making faces – How to display an image for all your blog comments

Posted on April 21, 2010 by Lars Vogel

Have you ever wondered why some people have a friendly face when posting a blog comment while others seems to look quite anonymous? 😉 Here is one possible solution: Gravatar provides a service which allows you to use a single … Continue reading →

Posted in Eclipse, Softskill Topics, Web | 4 Comments

How to create a transparent background for an image with Gimp

Posted on February 10, 2010 by Lars Vogel

The following will explain how to create an image with a transparent background with the freely available tool Gimp. GIF and PNG images can have transparent backgrounds. JPEG can not have a transparent background. Lets take the following example picture. … Continue reading →

Posted in Web | Comments Off on How to create a transparent background for an image with Gimp