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The Axon Framework (http://www.axonframework.org/) is a great help in the work so far. It supports exactly the topics "Event Sourcing" and "CQRS", so that one can concentrate almost completely on the programming of the technical important things about games. Even if such an extensive framework naturally requires some training before use - which is one of the reasons why you haven't heard anything from myself for so long (smile) - I was able to work out some patterns that I will use again and again in the future meanwhile.
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