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Category Archives: Web
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
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
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
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
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
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
This you want to integrate to Twitter from Java you can use the following library JTwitter. Try out the twitter integration with the following coding: Another Java Twitter Library is Twitter4J.
After banging my head against the wall in trying to find out how I can use Java class in a Grails application I found out that the solution is embarrassing simple. Just create a jar file from your Java classes … Continue reading
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
Google App Engine for Java permits three ways of storing your data: JDO, JPA and the low-level API. All data is ultimately stored in Bigtable. This blog post will give a little example how you can store data via the … Continue reading