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Akka samples with scala and Spring


I was looking around recently for Akka samples with Spring and found a starter project which appeared to fit the bill well. The project however utilizes Spring-Scala which is an excellent project, but is no longer maintained. So I wanted to update the sample to use core Spring java libraries instead. So here is an attempt on a fork of ...

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Do Not Make This Mistake When Developing an SPI


Most of your code is private, internal, proprietary, and will never be exposed to public. If that’s the case, you can relax – you can refactor all of your mistakes, including those that incur breaking API changes. If you’re maintining public API, however, that’s not the case. If you’re maintaining public SPI (Service Provider Interfaces), then things get even worse. ...

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Getting version string from a Maven based web application


When you package a maven project, it will automatically generate a file inside that will contains the version, artifactId and groupId information. These are handy to have and to display for your web application at runtime. One can use a method like following to retrive it. public class Application { private String version; public String getVersion() { if (version ...

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Quasar and Akka – a Comparison


The actor model is a design pattern for fault-tolerant and highly scalable systems. Actors are independent worker-modules that communicate with other actors only through message-passing, can fail in isolation from other actors but can monitor other actors for failure and take some recovery measures when that happens. Actors are simple, isolated yet coordinated, concurrent workers. Actor-based design brings many benefits:     ...

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What is Garbage Collection?


The following is an example from our Garbage Collection Handbook which will be published in the forthcoming weeks. In the meanwhile, take your time to get yourself familiar with the basics of the Garbage Collection – this is going to be the very first chapter of the book. At the first sight, garbage collection should be dealing with what the name suggests – finding ...

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How to Make More Money (and the plateau)


Most extended discussions about the technology industry and software engineering trade eventually find their way to the topics of worker supply and demand, talent shortages (real or otherwise), and compensation. Every Best Jobs of The Year list (examples here or here or here or here) features a Top 10 littered with assorted job titles given to those who code, often including salary data that could cause non-technical readers to regret life decisions. New ...

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Constructors Must Be Code-Free


How much work should be done within a constructor? It seems reasonable to do some computations inside a constructor and then encapsulate results. That way, when the results are required by object methods, we’ll have them ready. Sounds like a good approach? No, it’s not. It’s a bad idea for one reason: It prevents composition of objects and makes them ...

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Neo4j: Finding all shortest paths


One of the Cypher language features we show in Neo4j training courses is the shortest path function which allows you to find the shortest path in terms of number of relationships between two nodes. Using the movie graph, which you can import via the ‘:play movies’ command in the browser, we’ll first create a ‘KNOWS’ relationship between any people that ...

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How to Access a Method’s Result Value From the Finally Block


While the JVM is a stack-based machine, the Java language doesn’t really offer you any way to access that Stack. Even if sometimes, in rare occasions, it would be very useful. An example Method result values are put on the stack. If you look at the following example: public int method() { if (something) return 1; ... if (somethingElse) return ...

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