Blog

When you send a message to an LLM like Claude or ChatGPT, the model does not see your text. It sees tokens. I wanted to see them too, so I built a small page for that.

Try it here: LLM Tokens Playground

The one command that installs an MCP server in Claude Code, and what its parts mean.

Generate REST client code in TypeScript from an OpenAPI specification.

How to customize an Ant Design Theme in react-scripts - easily and without ejecting.

Here I explain how to setup Guard to run 'bundle install' automatically everytime you modify your Gemfile.

Guard watches the files in your project and runs a command or plugin when they change. A tutorial that gets you started faster than the Guard website does.

Recently, I have published a Redis client library for Crystal called Crystal-Redis.

This week I published Crystal-Redis, a Redis client for the Crystal programming language. It is open source, full featured, well documented and very fast.

Nginx 1.4 finally went stable. This new version comes with SPDY integrated. If both web browser and server support it, SPDY improves your site's performance.

I figured out how to get Sphinx / thinking_sphinx to handle searches with german umlauts and treat the umlauts as case insensitive.

How to fix 'ArgumentError: invalid byte sequence in US-ASCII' during bundle install on Mac OS X by setting the LANG environment variable.

Rmagick creates uncompressed images by default. How to set the compression level in Rmagick's write method to get smaller PNG and JPG files.

How to print the current page's content in a Capybara integration test, for example to debug a failing test, and how to open it in a browser.

You probably got this error message in Ruby on Rails: 'invalid multibyte char (US-ASCII)'

The crowd_rails plugin brings single sign on with Atlassian Crowd 2.0 to Ruby on Rails, next to Jira, Confluence and Bamboo. Setup and usage tutorial.

The new version 0.5.10 of the crowd-stefanwille fixes a bug in handling of validation factors.

I took the Ruby client gem for Atlassian Crowd 1.6 and updated it for Crowd 2.

Why 'bundle install' used to be slow in Capistrano deployments, and how a Gemfile.lock checked into version control makes it fast.

Every agile book recommends splitting epics into smaller user stories. What we learned when we built one epic as a single story and split the next one.

Business people keep asking developers for numbers and reports from the production database. Here is how I let them query a copy of the database themselves.

I am searching for a new colleague: A sharp, experienced Ruby on Rails developer for our internet startup Balao in Hamburg.

Google Books has scanned my book Spring & Hibernate. Large parts of it can now be read online, for free.

I found an illegal copy of my book Spring & Hibernate on RapidShare. RapidShare removed the file after I complained by email.

SVA BizSphere GmbH has a great page up that describes its product BizSphere, the software that I worked on over the past 2.5 years.

Here is a description of Content Landscape, a project for which I did architecture and specification work during my BizSphere engagement.

Our publisher will start selling the second edition of our book _Spring & Hibernate_ in April, 2008.

On November 23, 2006 I became a Certified Scrum Master (CSM). Why I chose Scrum over other software development processes, and what a Scrum Master does.

On October 26, I spoke about Hibernate at Lehmann's book shop in Hamburg.

A few years ago, I wrote a book called 'Go To Java Server Pages'. It was published by Addison Wesley in 2001.