perform tests

roo org.springframework.orm.jpa.JpaOptimisticLockingFailureException: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction

The problem was here, that my database table which stored the specific entities had a version column but only NULL values inside. I have replaced the NULLs with an numeric value and then it worked.

“Updating Maven Project”. Unsupported IClasspathEntry kind=4

The problem is somehow related to the m2e plugin integrated in the STS.

So solve this select (right click) on the STS/Eclipse modules

Maven -> Disable Maven Nature

Maven Disable Maven Nature in STS (Eclipse)

run in the terminal

mvn eclipse:clean

and select again in STS

Configure -> Convert to Maven Project

There was some tweaking necessary to support images as nodes, so I have changed some parts of arbor, which you can see on GitHub.

Besides this I made this theme more responsive by using Foundation which is also a wonderful framework.

via dev.twitter.com:

This means that if you currently use signed 32-bit integers to track user IDs in your system, you should update your code to use 64-bit integers as soon as you can. To be safe, and to provide a date to aim for, we recommend making this change by July 1, 2013.

Yeoman is a robust and opinionated client-side stack, comprised of tools and frameworks that can help developers quickly build beautiful web applications. We take care of providing everything needed to get started without any of the normal headaches associated with a manual setup.

With a modular architecture that can scale out of the box, we leverage the success and lessons learned from several open-source communities to ensure the stack developers use is as intelligent as possible.

As firm believers in good documentation and well thought out build processes, Yeoman includes support for linting, testing, minification and much more, so developers can focus on solutions rather than worrying about the little things. (via yeoman.io)

Read some more detailed information here:

• Announcing Source Code Pro
• Source Sans Pro: Adobe’s first open source type family

Personally I have tried it in a terminal and in IntelliJ and on TextMate. It really didn’t convince me and I removed it after 10 minutes of using it. I got an headache and my eyes were hurting. :) But it looks nice somehow, but for heavy usage I won’t recommend it.

Then Professor Viralo is for you. ;) It’s our experimental Twitter Engagement Robot. Designed as a proof of concept it interacts automatically with Twitter. It uses the chatbot technology of Pandorabots and some smart other things. Just take a look, the code is on Github.

It’s not for a productive system and should give other happy coders just some inspiration and ideas how to handle Twitter engagement in an automated way.

• Check out the Professor Viralo page here on Happy Coding and/or
• the Github repository.

This is not so good, because then there is always the need to restart the spawn-fcgi process, which is annoying if you need to do this manually. So I thought it might be good to to this in a automatic way.

Note: This is not a real solution for this problem, because it doesn’t resolve the problem it just saves you some time. ;)

A nice & easy way is to use monit as a proactive monitoring solution for this. Because I am using Debian I will install it using:

apt-get install monit

After that we have the files

• /etc/default/monit and
• /etc/monit/monitrc

/etc/init.d/monit start

Monit is a free open source utility for managing and monitoring, processes, programs, files, directories and filesystems on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.

[arrowlist]

• see release notes.
• see announcement
• download.

[/arrowlist]

Some Highlights from MongoDB 2.2 (see release notes)

Aggregation Framework

The aggregation framework makes it possible to do aggregation operations without needing to use map-reduce. The aggregate command exposes the aggregation framework, and the db.collection.aggregate() helper in the mongo shell provides an interface to these operations. Consider the following resources for background on the aggregation framework and its use: