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Open Bachelor Theses

On this website you can find an overview of the theses we are currently offering. If you don't find a suitable topic among the theses, then simply have a look at our research topics for an area of interest and ask the contact person. Please also include relevant details about your current knowledge and previous experience in the domain of your request.

Adding Hypermedia as the Engine of Application State to RESTful Web Services

Area of responsibility: Ableitung von Service-Spezifikationen

Author/Person dealing with: Not assigned


- Motivation:

The REST (Representational State Transfer) architectural style includes the principle of Hypermedia as the Engine of Application State (HATEOAS). Response messages of HATEOAS compliant web services contain all possible valid states the web service can take in a next step. Thus, such web service rep-resent a finite-state automaton. Clients that use the web service, only need to know its initial states. Ideally, the clients do not need to be adapted in case this automaton changes afterwards. Many of today's web services that claim to be RESTful do not consider HATEOAS. Such web services are not fully compliant with REST.

- Task:

The task of the bachelor's the-sis is to support developers in making their RESTful web ser-vices HATEOAS compliant. This is to be achieved by us-ing an existing technique that mines behavioral models (pe-tri nets or BPMN models) from call logs. A web service's states and transitions can be represented by such behav-ioral models. These models can be used to determine all next possible states of a web service. The response messages of non HATEOAS compliant web service shall be automatically expanded by the information about the next valid states. Hence, this approach would help to evolve RESTful web services.

- Literature:

Liskin et al.: Teaching old services new tricks: adding HATEOAS support as an afterthought

Contact: Simon Schwichtenberg

Attachment: HATEOAS.pdf

Cross-Device Integration of Windows, MacOS, or iOS Applications


Today, our favorite applications are distributed across multiple devices, e.g., we write documents using office applications on desktop computers, share texts and images using messenger on smartphones, or listen to music using our favorite streaming app on smart TVs. Unfortunately, integrating apps running of different devices is often not supported, instead manual effort or workarounds have to be used to increase the user experience across multiple devices. In our previous work [1, 2], we already developed an approach allowing to integrate services provided on Android devices into applications running on other devices. In this thesis, the approach shall be extended to other platforms, namely Windows, iOS, or MacOS.


  • Analyzing current means  for inter-application communication on one of the following platforms: Windows, iOS, or MacOS. 
  • Design of an approach to realize the cross-device integration of applications running on one of these platforms (e.g. by using adapters)
  • Implementation of a prototype which enables the cross-device integration for the respective platform and integrates with our current framework
  • Validating the approach by applying it for various applications


  • Familiar with Windows, MacOS, or iOS development
  • Having a device with the respective platform


[1] Dennis Wolters, Jonas Kirchhoff, Christian Gerth, Gregor Engels: Cross-Device Integration of Android Apps. In Proceedings of the 14th International Conference on Service Oriented Computing (ICSOC 2016). Springer, LNCS (2016) 

[2] Dennis Wolters, Jonas Kirchhoff, Christian Gerth, Gregor Engels: XDAI-A: Framework for Enabling Cross-Device Integration of Android Apps. In Proceedings of the 14th International Conference on Service Oriented Computing (ICSOC 2016). Springer, LNCS (2016)


Dennis Wolters


The University for the Information Society