Java Forum Stuttgart – Part 2

After a long time since my first post, I had the time to write another one. In Java Forum Stuttgart – Part 1 I described the first talks I attended at the JFS 2016. In this post I will present some more impressions about the JFS.

HomeKit, Weave oder Eclipse SmartHome?

The third talk I listened to compared several smart home frameworks and their chances in the future. As an entree Apple HomeKit and Google Weave were presented. Both systems are designed as closed systems. Every vender who would like to integrate his devices into one of those systems has to support the protocol of this particular system. But because there is a big zoo of protocols out their, the presenters expect that none of this systems will be the single home automation solution for the future.

After this 5 minute introduction to the fail of HomeKit and Weave, Eclipse SmartHome (ESH) is presented as the system which could succeed in being the single solution. They base their assumption on the basic design of ESH. ESH is not a single solution. It is more like a framework where every vender can integrate his devices. Developers on the other side can access the devices in a unified way and build their solution based on ESH. One of this solutions is OpenHAB. It is the predecessor of ESH and is build on top if it.

Über den Umgang mit Lamdas

The last talk before lunch break was held by Michael Wiedeking. I heared him speaking at Herbst Campus in 2012 and was excited about his talk. Talks by him are mostly very informative and entertaining at the same time. After a first introduction what was needed to implement method references and lambdas in Java 8, he talked about the usage of lambdas in Java 8, especially how useful lambdas and method references are. At the end of his talk he presented a first solution how you can handle checked exceptions inside streams.

Top Performance Bottleneck Patterns Deep Dive

This talk was another entertaining and informative one at JFS. Andreas Grabner gave a short introduction to devops and how Otto – a big German retailer – improved its performance and time to market of new features.

In the rest of the talk he showed simple metrics to measure performance in production and which common problems he often finds. One of those metrics is a click-heatmap to measure user experience. This map shows how often a users click on areas of your page, which can be an indicator about the responsiveness of your web page.

Afterwards he presents some widespread performance problems. Place one and two are reserved for bad database handling, like not using prepared statements to reduce parsing overhead. On place three you can find bad code, especially bad control flow management. Exceptions are basically a good idea, but they can reduce performance when used in the wrong way. You can find out more about this topic on his blog.
That is enough for today. The last talks of the Java Forum Stuttgart will be published – hopefully – soon.


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