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1. JPA Mini Book

2. JVM Troubleshooting Guide

3. JUnit Tutorial for Unit Testing

4. Java Annotations Tutorial

5. Java Interview Questions

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JUnit in a Nutshell: Yet Another JUnit Tutorial

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Why Another JUnit Tutorial? JUnit seems to be the most popular testing tool for developers within the Java world. So it is no wonder that there have been written some good books about this topic. But I still meet quite often programmers, who at most have a vague understanding of the tool and its proper usage. Hence I had the ...

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Apache Camel for Micro­service Architectures

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I’ve been using microservice architectures before I knew they were called so. I used to work with pipeline applications made up of isolated modules that interact with each other through queues. Since then a number of (ex)ThoughtWorks gurus talked about microservices. First Fred George, then James Lewis and finally Martin Fowler blogged about microservices making it the next buzzword so ...

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Tips for (unit testing) JavaBeans

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If you’re writing Java code chances are you’re writing at least a few classes that adhere to the JavaBean conventions, i.e., classes that have private properties with public getter and setter methods, contain a no-arguments constructor, are serializable, and comply with the Equals and HashCode contract. And on top of that you’ll probably also throw in a useful toString() implementation. ...

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Eliminating Development Redeploys using Gradle

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For service development, my team recently moved away from Grails to the Dropwizard framework. One of the things I really missed from the Grails stack, though, was auto-reloading: any changes to source files appear in the running app moments after saving, without a restart. It proved feasible to pull this functionality into Gradle builds as well. Spring Loaded is the ...

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Android promoted Actions: Floating action button (FAB)

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Recently new design pattern were introduced in Android. One of the most known pattern is the Promoted Actions. They are actions that  are directly visible in the UI instead of using action bar button; for this reason these actions are called promoted, they can be easily accessed and define the main action in the current UI. For example, if we ...

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One Jar To Rule Them All: Apache TomEE + Shrinkwrap == JavaEE Boot

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WARNING: I am not an expert of Spring Boot. There are a lot of things that I find really interesting about it and of course that can really improve your day-to-day work. Moreover I don’t have anything against Spring Boot nor people who develop it or use it. But I think that community are overestimating/overvenerating this product. A year ago ...

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Built-in Fake Objects

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While mock objects are perfect instruments for unit testing, mocking through mock frameworks may turn your unit tests into an unmaintainable mess. The root cause of this complexity is that our objects are too big. They have many methods and these methods return other objects, which also have methods. When we pass a mock version of such an object as ...

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