Recent posts

Spring Data Neo4j, Neo4j-OGM and OSIV

TL;DR: Don’t use Open Session in View with a Neo4j-Cluster If you use Spring Data Neo4j and Neo4j-OGM in your Spring Boot application connectect against a Neo4j cluster (via bolt+routing://, neo4j:// or multiple bolt-uris), configure explicitly to false like this: What is Open Session in View? Vlad Mihalcea has written extensive amounts about […]


Short end of the year status update.

Last year – 2018 – I ended up with 21 post on my blog, this one here, the last of this decade at this blog, will be the 11th of 2019. What happened? I have been working more than ever, and happier than ever. Together with Gerrit Meier, we managed to bring down the open […]


Query all the things

Over the last weekend, I had some time on my hands and revisited my biking application: That application turned 10 this year, started as a Sinatra based Ruby application in 2009 and helped me a lot from the late 2013 and early 2014 in my career. Back then, I was using Spring for a […]


What’s a Bill of Material BOM file?

Wikipedia says: A bill of materials or product structure (sometimes bill of material, BOM or associated list) is a list of the raw materials, sub-assemblies, intermediate assemblies, sub-components, parts, and the quantities of each needed to manufacture an end product. A BOM may be used for communication between manufacturing partners or confined to a single […]


Spring Security 5.1: Upgrade / Rehash stored passwords

In this post from early 2018, I described the new password infrastructure of Spring Security 5.0. As the post got some feedback the last couple of days, I jumped back a bit into Spring Security code and noticed this method here: PasswordEncoder#upgradeEncoding. Hm, what does it do? It turns out, it works together with the […]


Oh, all that entitlement…

There was a tiny tweet yesterday, resurrecting a talk from Christin: In 2011 I saw @ChristinGorman hold this fantastic lightning talk/rant at JavaZone, and I have never forgotten it. So, Christin, if you want some return on investment on your speaking, look no further. Here is this gem for you all to enjoy — […]



Hi! My name is Michael Simons. I live in Aachen and create software for a living. You can read more about me on the "About me" page. This blog mostly contains posts about Java and Softwarearchitecture with a strong focus on the Spring eco system.
Below is a list of featured posts and a collection of talks. Featured posts are either part of a bigger series, have a relevance somewhere else or are just posts I like.
See all posts in the archive. Just another nerd blog is more than 10 years old and the archive has become quite huge.
Good stuff cannot be achieved alone. A salute to several great people in my life: NetBeans Dream team and more. And certainly, lots of ❤️ to my family and my wife who always supports me and my crazy ideas.