Welcome to TechScreen

Welcome to the TechScreen site. This side shall support the exchange of knowledge in the domain of Web Engineering and related aspects. As a side effect, this side is used for research on knowledge management technologies. User can pose challenges in the problem domain and can participate in quizzes. Further a bibliography about arcticles in different related domains is continously extended. Finally, questionnaires on different issues are provided. To be able to participate you need an account and a password from TU Wien's TISS system.

Starting multiple docker containers and let them communicate

When developing microservice-like architectures it is reasonable to assume that docker is used for deploying the individual services. In order to test if the services worke together properly, especially on a small scale, on can start a docker container for each service. Since each of the services gets its own network stack created by docker, they can by default not communicate with each other. It would be nice to have the possiblity to simply start all services at once and give them the possibility to communicate with each other using the hostnames of the services.

Windows 10 Start menue disappeared

In Windows 10, after starting the PC, the start menue was gone, nothing happened when clicking the windows sign in the bottom left corner. No reboot helped.

Dehaze module not visible in Lightroom 6

Having the latest pc version of Lightroom 6 installed and updated it to 6.6, the announced "Dehaze module" cannot be found. Since this is a popular way to improve photos with a lot of haze in it some way to integrate this function would be great.

Create (partial) backup of local MongoDB database

If one is developing some web application that uses a MongoDB database and wants to demonstrate the application, one might need some exemplary test data. This data needs to be created beforehand and it might be necessary to whipe the database between the creation of the test data and the demo.

Create (partial) backup of local MongoDB database

If one is developing some web application that uses a MongoDB database and one wants to demonstrate the application one might need some exemplary test data. This data needs to be created beforehand and it might be necessary to whipe the database between the creation of the test data and the demo.

Unable to edit git commit message with newly installed git

Git allows the user to provied commit messages either via a command line argument or by opening a text editor with a commit message file that the user can freely edit. The obvious benefit of the latter is that one can use all the functionality of the chosen text editor and it is in general easier to write proper commit messages than when simply supplying the message via a command line argument. When freshly installing git on a linux system, the git command line client assumes that the vi text editor is installed and will try to use it to let users edit the commit messages.

How to run a job automatically after Spring boot start

In a normal Spring MVC environment one of the to start a job automatically is define a class in the web.xml which will be initiated after the spring context is load. One of the advantages of the spring boot is that is does not need any XML file configuration which makes many developers life easier.

Laptop does not start

It was really strange that the laptop did not boot. It looks like the battery was emtpy in the first place but also after applying power nothing changed. It also was odd that none of the leds glowed while the power adapter was plugged in.

Parallel execution of a tests in TOSCA

For projects with significant test portfolio (over 5000 E2E tests) execution can take days. To speed up a process separation into different sets for distributed execution can be performed. The problem is that reporting on those lists must be aggregated manually afterwards.

Cannot connect to the internet. Also LAN Clients are unreachable

I was at university when I got a text message from my sister, that our internet at home does not work. Once a month or so, the Modem (provided my A1) crashes and needs to restart. I told her to do so, but the problem kept on. When I got home, I called A1 if the internet is down, but they said it was up. When I then could not connect to the A1-Modem via the browser, I knew there was something going one and needed further investigation. The "diagram" below shows the network.

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