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.

Building frontend fails with various (function undefined, etc.) errors

Now happening already two times in my career and spending some time with it, I find it worth telling my problem in this topic. After coming into a new company or to a new (existing) project you try to build the source code to start working on new features. A lot of times it happens that you receive error messages which do not happen on the colleagues work stations. Usually long working employees also fail to detect the root cause of this error. It actually comes from a differend node/npm version and errors from the build are very misleading.

CSS Styling a button does not yield the desired outcome

When trying to incorporate a new page into an existing website with corporate styling, I came to a problem which was hard to detect (for me). A newly created button should have a slightly different position and edge rounding than all other styled buttons as it comes from a different context. Whatever I've done, I never got the correct styling, like magically ignored by the browser. Learning about the developer console I digged deep into the css styling and found out that a <div> from a container forced its own styling on the button.

XML Parsing Library in a JIRA Plugin does not work

When developing a JIRA Plugin and trying to parse XML data from external sources and displaying it, the parsing with the commonly used Woodstox library failed with the following error: javax.xml.stream.FactoryFinder$ConfigurationError: Provider com.ctc.wstx.stax.WstxInputFactory not found Debugging took a considerable amount of time as the library was actually added into maven but was not available once installing the plugin in JIRA. The problem relied in OSGi class loading and a problem with the xml parsing library architecture which has its root in an IBM architecture decision.

How to mock a new instance

Which kind of possibility do we have in order to mock a new instance in the class which we want to test.

what is the mainly characters of Object oriented programming language

Nowadays, the concept of the Object oriented programming becomes more and more popular. What is the mainly characters of it?

What is the most important difference between H2 and PostgreSQL

During the software implementation, it is always difficult for us to decide which one of the database should we use as the technology stack. Especially for the database. So what is the mainly difference between H2 and PostgreSQL.

[Quizzes][Knowledge Management] - Typo in Question

Is there a typo in "Question 10" of "Portals and Content Management Systems" where the question reads "A kind of partite is realized in DRUPAL by ..." ?

Error 504 - Gateway Timeout

This error appears when your connection is to slow or when so many people try to acces to that server.

Pop up adds

There are common sites, usually the ones used to watch streamings, that have a lot of pop up adds, so when you try to, for example, wathc a tv serie, appear lots of pop up's. And there are many of them a little bit disgusting.

Territorial restriction

When I try to watch videos of pages of other countries an error ocurred because those videos had a territorial restriction. That's a problem when watching news of my home country.


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