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KeljuCaaS is a service in the dependency engine of OpenReq infrastructure that primarily focuses on the contexts, which already contain a large number of existing and dependent requirements, such as large distributed open source projects or large systems engineering projects. For example, the Qt Company has about one hundred-thousand (100,000) issues in its Jira. The dependency engine focuses on the entire body of requirements as an interdepedent "requirements model".

This service was created as a result of the OpenReq project funded by the European Union Horizon 2020 Research and Innovation programme under grant agreement No 732463.

Technical Description

KeljuCaaS is a generic inference engine for product models. For requirements models, KeljuCaaS is used through the Mulperi service, which composes a requirements model from requirements in the OpenReq JSON format and transforms the requirements model to more generic Murmeli product model. For further details, see the Mulperi service. That is, in the case of requirements and OpenReq, KeljuCaaS should not be accessed directly.

The following technologies are used:

  • Java
  • Spring Boot
  • Maven
  • GSON
  • Choco

Public APIs

The API is documented by using Swagger2:

How to Install

Run the compiled jar file, e.g., java -jar KeljuCaaS-1.6.jar.

KeljuCaaS uses port 9205 that needs to be open to in order that the endpoints and Swagger page can be accessed.

How to Use This Microservice

See Mulperi. The swagger page of KeljuCaaS describes all endpoints that can be used for testing purposes.

Notes for Developers

None at the moment.



How to Contribute

See the OpenReq Contribution Guidelines here.


Free use of this software is granted under the terms of the EPL version 2 (EPL2.0).

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