Andrej Koelewijn

Here’s a simple file monitoring tool which uses cometd to push file changes to a webpage. The server part consists of a groovy script which uses Apache Camel to monitor some files. It then uses Apache Camel to push the lines added to the files to the browser with Cometd. In the webpage a bit [...]

I always surprises me what people think open source means and what impact it has on their organization: Open Source means gratis software. Open Source is made by hobbyist. Open Source is unfinished because it doesn’t have a 1.0 version. We can only use the binaries released by the Open Source organization. Imagine my surprise [...]

Here’s a quick example (thx enno) how you can unit test an smtp endpoint in Mule using subethasmtp Wiser. We’ll start by creating a new mule project using maven: If you have problems with dependencies when you run mvn compile, here’s a blog post that will explain how to fix the osgi dependency problems. Next [...]

A coworker found a message on the mule-user mailing list that said that you have to apply response transformers on inbound endpoints, not on outbound endpoints. Sounds a bit weird to me, at least not very intuitive. Time for a test. Response transformer in a pass-through-router Here’s the mule config: Here’s how i start Mule: [...]

So Oracle just bought Sun. At first look it might seem like closed source versus open source. Most of Oracle’s well known products are closed source, whereas most of Sun’s products are open source. But that’s not the full story. Oracle is also involved in Open Source. It just takes a different approach. There are [...]

Interesting discussion on friendfeeds new database usage: How FriendFeed uses MySQL to store schema-less data. It’s basically a key-value database implemented on top of mysql, to get around schema-change and index performance problems in mysql. There is a lot of activity around non-RDBMS databases recently. Although it’s always interesting to see new development and innovation, [...]

Just saw this statement on succesful open source projects by Jay Kreps on the Linkedin blog: The long-term success of an open source project depends on its not being controlled by a single company, person, group, but forming a real self-sustaining group of interested developers. I couldn’t agree more. Open Source is about group collaboration. [...]

Here are some pictures i took after the election of the first board of OSSLO. OSSLO is a group of commercial companies that want to promote Open Source Software as a professional alternative to closed source software. I think this is a very important message. Too many people still think Open Source equals Hobby Software, [...]

I’m still playing around with groovy scripting. It’s an excellent way to quickly prototype some ESB scenarios. Last week i blogged about using groovy to write files to a gtalk account using Apache Camel, the example below shows you how to start an ActiveMQ broker, which persists messages to a PostgreSQL database. An Apache Camel [...]

The latest release of Java Magazine contains an article i wrote titled: Client Server 2.0 with jQuery and Grails. Unfortunately, not all code examples fitted into the magazine. You can download the complete article, including screenshots and sourcecode here: Client Server 2.0 met jQuery en Grails (dutch).