Final Thesis: The Benefits of Continuous Deployment Evaluated Using the JDownloader Software

Abstract: Continuous Delivery and Continuous Deployment approaches have seen widespread adoption in the software industry. To harness such techniques effectively, close monitoring and detailed knowledge about the state of software in production is highly desirable. This thesis analyzes the JDownloader Immune System, a real-time monitoring and error detection mechanism developed for the open source download manager software JDownloader. It describes the mathematical model for error detection based on time series analysis and Holt-Winters-Forecasting. The thesis continues to provide insight on the architecture of the immune system and shows how it provides useful information to developers and users through state dashboards. Finally, it evaluates the effectiveness of the immune system compared to manual user reports. The thesis finds that error detection speed for severe issues is 16 times faster than through manual reports and critical bugs are more than four times more likely to be detected within the first 24 hours after their first appearance.

Keywords: Continuous software engineering, continuous deployment, continuous delivery, JDownloader

PDFs: Master Thesis, Thesis Description

Reference: Michael Weber. The Benefits of continuous deployment evaluated using the JDownloader software. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Upcoming Talk on the collectd Community Open Source Project by Florian Forster of

We will host an open source talk on “collectd” in FLOSS, our course on free/libre, and open source software. The talk is free and open to the public.

  • by: Florian Forster,
  • about: The collectd community open source project
  • on: July 17th, 2017, 13:00-14:30 Uhr
  • at: FAU, Erlangen Süd, H6
  • as part of: FLOSS

Abstract: collectd is a community open source software project which was started by a student (an FAU alumni) and which has many corporate users and contributors. Most of the project’s initial organization and even its licensing had to change to make project maintenance sustainable and to better serve the project’s diverse user base. This talk will highlight some problems that were encountered and discuss the current organization of the project.

Speaker: Florian Forster is an FAU alumni and collectd maintainer. In his day job he’s a Site Reliability Engineer at Google. On parental leave, he is currently improving the house, not software.

Final Thesis: Managing Organization Data for Patch-Flow Measurement

Abstract: Open source practices and the establishment of an open source like culture within organizations is also called Inner Source (IS). The existing software Collaboration Metric Suite (CMSuite) provides metrics about collaboration between software projects. These metrics can validate the application of IS in organizations. However, the underlying model of the CMSuite currently only supports simple hierarchical organizational structures. Organizations with a more complex structure can not be correctly mapped. In this thesis, a model was designed and integrated into the CMSuite, that fulfills the requirements of a complex organizational structure. For this purpose, two case studies, which show the weaknesses of the current model, were studied. Finally, it was shown that dealing with complex organization structures is not a problem for the CMSuite anymore.

Keywords: Software engineering, mining software repositories, inner source

PDFs: Master Thesis, Thesis Description

Reference: Andreas Bauer. Managing Organization Data for Patch-Flow Measurement. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: A Theory of Industry Best Practices of FLOSS Governance and Compliance

Abstract: Using open source code in commercial software development is gaining more and more momentum during the recent years. While providing benefits along all three dimensions of the software development’s magic triangle of cost, time and scope, use of open source in commercial setting holds certain risks and challenges that can be addressed with FLOSS governance and compliance in the organization. However, the surveys show that about a half of the companies dealing with open source in their software development do not have any specific FLOSS governance procedures. The objective of this thesis is to develop a theory of FLOSS governance and compliance best practices in software development companies. The study uses case study research methodology applied to five German companies. The best practices are derived from the data collected during semi-structured interviews with the help of Qualitative Data Analysis. Key research findings are summarized and the full list of derived best practices in the form of best practice patterns is presented. The formulated best practices in the categories “Policies”, “Processes” and “People and Tools” can be used by software companies to leverage the advantages of using open source while mitigating the associated risks.

Keywords: Open source software, FLOSS, FOSS, proprietary software, FLOSS government, open source license compliance, software development management, case study, best practice

PDFs: Master Thesis, Work Description

Reference: Viktoriya Promyshlyanska. Theory of Industry Best Practices of FLOSS Governance and Compliance. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: Integration of a Refactoring UI into the Sweble Hub Software

Abstract: Wikis are an essential part of modern internet in order to store knowledge. However, to date, they lack functions which assist on restructuring and transforming the contents of a wiki. The task of maintaining the contents and structure is therefore time-consuming and error-prone. This thesis designs and implements a user interface for restructurings in wikis build on the Sweble Hub software, which is a software similar to most wikis. In contrast to classic wikis, it is able to provide assistance on restructurings. With Sweble Hub and the user interface designed in this thesis, the wiki authors’ efficiency is greatly improved.

Keywords: Wiki, AST, Refactoring, Transformation, UI

PDFs: Master Thesis, Work Description

Reference: Gabriel Bauer. Integration of a Refactoring UI into the Sweble Hub Software. Bachelor Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: Tree-based, Semantic Article Difference Visualization

Abstract: Die Plattform Sweble Hub ermöglicht es, Wiki-Inhalte auf Basis des Wiki Object Model s kollaborativ zu bearbeiten. Dies findet dadurch nicht, wie normalerweise üblich, auf Wikitext-Ebene statt, sondern nach dem Prinzip ’what you see is what you get’. Ziel ist es, das existierende Projekt um eine übersichtliche Artikel Diff Visualisierung zu erweitern, die es ermöglicht, einen verständlichen Überblick über getätigte Änderungen zu erhalten. Im Rahmen dieser Bachelorarbeit wird eine Lösung vorgestellt, wie man Wikitext-Datei-Versionen anschaulich vergleichen kann. Die Grundlage hierfür sind Baumbasierte Algorithmen und Datenstrukturen, die Wikitext-Dokumente und erfolgte Modifikationen semantisch interpretieren können. Dies erzeugt im Vergleich zu Text-basierten Diffs eine detailliertere Darstellung. Die erarbeitete Ausarbeitung soll in das Sweble Hub eingebettet werden.

Keywords: Wiki, AST, Diff, Tree-based Diff, HD-Diff, Visualization, Web, HTML

PDFs: Master Thesis, Work Description

Reference: Oliver Lutz. Tree-based, Semantic Article Difference Visualization. Bachelor Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Final Thesis: Text Mining for Relationship Extraction

Abstract: Qualitative Data Analysis (QDA) methods are based on manual coding of texts. To extract a domain model from a text corpus using QDA, information has to be extracted and compiled into the domain model by hand. This is especially a problem for cases where large amounts of data have to be analyzed. For this purpose, We present a relationship extraction approach based on Natural Language Processing. It automates the extraction of relationships between codes that were provided by the coder. This speeds up the analysis process and helps to uncover relationships the human coder might have missed. Our method produces a graphical overview of relationships that were found to exist between codes. It is evaluated by comparison with previously generated models from existing Qualitative Data Analysis projects.

Keywords: Information Retrieval, Text Mining, Natural Language Processing, Qualitative Data Analysis, QDA

PDFs: Master Thesis, Work Description

Reference: Martin Hofmann. Text Mining for Relationship Extraction. Master Thesis, Friedrich-Alexander-Universität Erlangen-Nürnberg: 2017.

Newsletter (to FAU Students) 2017-03

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Upcoming Industry Talk on Product Management by Markus Stipp of sunhill technologies GmbH

We will host an industry talk on “Hands-on Product Management: Challenges and Learnings” in AMOS, our agile methods course. The talk is free and open to the public.

  • by: Markus Stipp, sunhill technologies GmbH, a subsidiary of Volkswagen Financial Services
  • about: Hands-on Product Management: Challenges and Learnings
  • on: June 14th, 2017, 10:15-11:45 Uhr
  • at: FAU, Erlangen Süd, H10
  • as part of: AMOS

Abstract: With the rise of agile methods in software development and the lean startup movement in business, product management has evolved considerably from long development cycles to fast and lean iterations. Many organizations are struggling to implement these fast cycles into their daily business. This presentation will look at the role of product management, highlight some of the challenges and give key insights from hands-on product management.

Speaker: Markus Stipp has been building products for over 7 years. With his startup Netdosis he set out to provide validated medical information to pediatricians and built Germany’s first database for off-label-use. As a freelance product manager he has supported startups and companies in the domains of biomedical engineering, medical devices, and banking. At sunhill technologies, Markus is responsible for TraviPay, the leading app for mobile parking payments in Germany.

Upcoming Industry Talk on Scaling Scrum by Andreas Gärtner of Senacor Technologies AG

We will host an industry talk on “Scaling Scrum (or how to pimp up a simple concept) in AMOS, our agile methods course. The talk is free and open to the public.

  • by: Andreas Gärtner, Senacor Technologies AG
  • about: Scaling Scrum (or how to pimp up a simple concept)
  • on: July 12th, 2017, 10:15-11:45 Uhr
  • at: FAU, Erlangen Süd, H10
  • as part of: AMOS

Abstract: Scrum has been the agile methodology of the last decade and will accompany us for the years to come. But not only small startups are employing the concept, also more and more large companies are choosing Scrum as their primary way of doing software development projects. As projects in those companies tend to be pretty complex and are influenced by numerous stakeholders, different approaches (SAFe, DAD, LeSS, ..) have been proposed to implement Scrum on a larger scale. The presentation will not go into technical details of those approaches but rather give a critical view on the common problems and pitfalls when going down that road by recounting practical experiences.

Speaker: Andreas Gärtner graduated in Computer Science at a time where Java just began to overtake C++, Object Orientation was the only relevant architectural concept and nobody questioned the rule of Relational Database Systems. Scrum had been a term only known to hard-core Rugby fans. Today Andreas is a partner at Senacor Technologies and has experienced how the (IT-)world has changed. Being a long-year product owner in an agile software development project, Andreas is able to share his rich experience in that area.