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Guess, don’t measure

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I have lost count in how many occasions I have recommended to start all performance tuning activities by setting goals and measuring baseline instead of tuning random bits in your source code. In the current post I will give you a counterexample about what just happened. We have been revamping our own internal monitoring tooling to make sure our production ...

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Development Horror Story – Mail Bomb

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Based on my session idea at JavaOne about things that went terrible wrong in our development careers, I thought about writing a few of these stories. I’ll start with one of my favourites ones: Crashing a customer’s mail server after generating more than 23 Million emails! Yes, that’s right, 23 Millions!               History A ...

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CallSerially The EDT & InvokeAndBlock (Part 2)

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The last time we talked about the EDT we covered some of the basic ideas, such as call serially etc. We left out two major concepts that are somewhat more advanced. Invoke And Block When we write typical code in Java we like that code to be in sequence as such:     doOperationA(); doOperationB(); doOperationC(); This works well normally ...

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Use reactive streams API to combine akka-streams with rxJava

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Just a quick article this time, since I’m still experimenting with this stuff. There is a lot of talk around reactive programming. In Java 8 we’ve got the Stream API, we got rxJava we got ratpack and Akka has got akka-streams. The main issue with these implementations is that they aren’t compatible. You can’t connect the subscriber of one implementation ...

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Spring boot war packaging

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Spring boot recommends creating an executable jar with an embedded container (tomcat or jetty) during build time and using this executable jar as a standalone process at runtime. It is common however to deploy applications to an external container instead and Spring boot provides packaging the applications as a war specifically for this kind of a need. My focus here ...

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Slides from Nuts and Bolts of WebSocket at #Devoxx 2014

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Peter Moskovits from Kaazing (@peterm_kaazing) and I gave a university talk at Devoxx 2014 on Nuts and Bolts of WebSocket. The slides are now available at:                       The entire session is recorded and will be made available on parleys.com in the coming weeks/months. The complete script for the demo is available ...

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CallSerially The EDT & InvokeAndBlock (Part 1)

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We last explained some of the concepts behind the EDT in 2008 so its high time we wrote about it again, there is a section about it in the developer guide as well as in the courses on Udemy but since this is the most important thing to understand in Codename One it bares repeating. One of the nice things ...

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