Category Archives: Web

Where are the vogella example projects at Github?

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

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

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

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

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

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

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