Begin of my master thesis about OSGi and PaaS providers

My studies go into the final round – since the first of February I work on my master thesis about (enterprise) OSGi applications and PaaS providers in the cloud. I evaluate an existing OSGi server application and try to migrate it to a PaaS provider. My deadline is in the mid of July 2014.

Photo by Kevin Dooley /

Photo by Kevin Dooley /

Right now I am doing my literature studies and try to get an overview about the topic. I don’t know the exact direction of my thesis yet, but I can figure out some problems along the road like databases, scalability, dependencies and deployment. And I think some more will show up soon.

I write my thesis by Informatica/Heiler in Stuttgart. I will blog about it from time to time under /tag/cloud.

Best regards,

Review: Cloud Computing – Chancen und Risiken aus technischer und unternehmerischer Sicht

One thing first: The book Cloud Computing: Chancen und Risiken aus technischer und unternehmerischer Sicht by Christian Metzger, Thorsten Reitz and Juan Villar is only available in German! I am sorry.

As a part of my literature studies for my master thesis I recently read Cloud Computing: Chancen und Risiken aus technischer und unternehmerischer Sicht by Christian Metzger, Thorsten Reitz and Juan Villar published by Hanser in 2011. Here is what I think about it.


A lot of different aspects

The book gives you an overview about a lot of different aspects on the topic of cloud computing. It really covers a lot: definitions, pros and cons, security, business aspects, vendors and some more. All aspects are described briefly but with enough information to get an understanding for what the topic is about. However, the book will only give you an overview. If you are interested in a certain topic (e.g. security) this book can only be a first hint, not more.

Who should read this book?

I really liked the book, but the question is who should read it? It is not technical enough for a developer and does not cover enough business aspects for a manager (I think). I think it is most suitable for someone wondering what cloud is and thinking about whether he could use it or not. You do not need knowledge in a certain field to understand the book. It is a good start to get in touch with cloud computing, but nothing more.

Best regards,

Review: Modular Cloud Apps with OSGi

Currently, I am doing my literature studies for my master thesis about OSGi and PaaS. One of the first books I read was Modular Cloud Apps with OSGi from Paul Baker and Bert Ertman published by O’Reilly. Here is what I think about it. Maybe it is a little bit ironic sometimes, but I hope you get the point.


Far more OSGi than Cloud

Modular Cloud Apps with OSGi is much more over OSGi than cloud. You will read about bundles, Bndtools, plugins and all the other (standard) OSGi stuff all over the book. The terms IaaS, PaaS and SaaS are explained on page 152 of 190 (including references and index). All stuff before is just OSGi. The only real cloud technology in the book is Amazon’s AutoScaling


As I said, the only “cloud” chapter in the whole book is the one about deployment (~8 pages). The author explains how you can deploy nodes with Amazon’s AutoScaling and the Apache ACE provisioning server. An examples as well as some scripts are provided. And by the way, Paul Bakker, the author of the book is a contributer of Apache ACE, which brings us to another topic called Amdatu.


You will find one term over and over in the book: Amdatu. Amdatu is a Java OSGi framework to build (modular) cloud applications. And guess what? It is build by one of the authors of the book, Paul Bakker! This could be the reason why Amdatu seams to be the answer for everything. How should we implement authentication? With the Amdatu token provider! And what about a REST API? Yeah, Amdatu has all the libraries packed in some OSGi bundles! And ever thought about some documentation? Amdatu has already repacked the Swagger framework! And don’t forget Amdatu Social, Amdatu Mongo and all the other stuff reinventing the wheel for you while talking about modularity to help you to don’t reinvent the wheel. Also consider to not use standard frameworks like Spring, Amdatu has a more modular solution! But try to search Amdatu on Google Trends

The world is not ready for OSGi

The world is still not ready for OSGi! After reading the book you get a notion that every existing Java framework is not modular enough and the only solution is to repack them all. None shall pass.

Riding the cloud wave

The book is really good to learn something about OSGi and maybe to get some insights into SOA. You will learn what bundles are, how provisioning can be done and what REST is. But the cloud part is really weak. The book does not cover any cloud system, any cloud service or any cloud SDK/API. What a pity. Modular Apps with OSGi would have been a much better title, but cloud sells.


By the way, there is an excellent video on YouTube by the authors of the book. IMHO the video explains much better how to build cloud apps with Amdatu and OSGi than the book. Especially the part about Apache ACE becomes very clear. Take a look:

Best regards,