Blog split 2

Posted by Jens Jäger on August 27, 2014

This blog will be splitted into two blogs. Here ( I will keep posting technical stuff about developing web applications with Java, Scala, Ruby, Javascript and Playframework. Some other geeky stuff might come along.

My new blog ( will be in german about business and investment.

I also removed the german stuff from here and moved all the old german posts to If you click on a link to a german post, you might be redirected to

If you speek german you’re welcome to have a look at the all new You might also want to follow my german Rss-feed or sign up for my shiny new newsletter.

Why two blogs?

When I started blogging I started in german. After some time I realized software development stuff is easier written in english. This is because allmost all resources are already in english and programming code has english keywords anyway.

Then I switched to write blogposts in english. That was fine. But having two languages in one blog is kind of ugly. I never cared much until I decided to write more about business an investing topics. The problem with this topics is, some parts like tax or law stuff is really country specific. A lot of investment or business advise I can give works only in germany. So I makes perfectly sense to write those posts in german.

This was the point I decided to split my blog into two and make this one english only.

New page for my consulting company 1

Posted by Jens Jäger on January 22, 2014

I just build a new german marketing page for my consulting company. It’s build with bootstrap and is much nicer than the old one, and has a full responsive design. Here is the before and after comparison:



Thoughts I took home from ping conference

Posted by Jens Jäger on January 17, 2014

Here are some thoughts I took home from ping conference:

  • Future applications will have more needs for functional programming. This demand is driven by async userinterfaces and data streaming over http from different sources. Think of an application streaming the realtime positions of cars to a map. Maybe a taxi search.
  • For me it’s not sure if the lambda functions for java 8 will be a door opener to bring more people to scala. Or will java lambda with some additional libraries good enough to not switch to scala?
  • There is a new javascript mvc framework every week. It will need a long time if ever until we have a mvc framework with a strong position like jQuery today. If you think back some years this was the same with javascript libaries, today jQuery is everywhere.
  • Almost every speaker at the conference uses IntelliJ on a Mac. There is probably a reason for that.
  • To be prepared for future functional programming challenges I should read the wizard book again and learn about free monads.


All over a great conference and really worth the travel. Also budapest is really a nice city to travel to.

Impressions from ping conf budapest

Posted by Jens Jäger on January 17, 2014

Here are some impressions from ping conference budapest. Great talks on play framework, scala and functional programming.











JaxWS with self signed certificates

Posted by Jens Jäger on December 31, 2013

Self signed certificates are common, especially on testservers. The java default solution to add the certificate to every developers and buildservers java vm is a pain in the ass. For the play WS api there is an easy workaround.

To use soap webservices with JaxWS and self signed certificates I found on Srđan Šrepflers Blog.

To use it you have add the following static calls to the class with the webservice call: