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JPA Tutorial – Setting Up JPA in a Java SE Environment

JPA stands for Java Persistence API, which basically is a specification that describes a way to persist data into a persistent storage, usually a database. We can think of it as ...

Programming a simple slot machine game using Java

No mat­ter how sim­ple or com­plex the game is, Java can do the job! On this post, let’s take a look at how begin­ners of Java pro­gram­ming can make a sim­ple, yet fully ...

JavaFX Tip 14: StackPane Children – Hidden But Not Gone

Another short tip: Swing provides a layout manager called CardLayout, which manages a set of components (cards) inside a container but always only shows one of them. The method, ...

Java Concurrency Tutorial – Visibility between threads

When sharing an object’s state between different threads, other issues besides atomicity come into play. One of them is visibility. The key fact is that without synchronization, instructions ...

This is Stuff: jUnit: Dynamic Tests Generation

Dynamic tests generation is useful when you need to run the same set of tests on many different input values or configurations. It can be achieved either using parametrized tests or ...

URL shortener service in 42 lines of code in… Java (?!) Spring Boot + Redis

Apparently writing a URL shortener service is the new “Hello, world!” in the IoT/microservice/era world. It all started with A URL shortener service in 45 lines of Scala ...

Java 8 : Functional VS Traditional

The business logic is the same : Given a String expression composed of visits / time like : “1/24h,1..3/3h,5/*” Then the result should be the following list of Strings: “1/24h”, “1/3h”,”2/3h”,”3/3h”, “5/1h”,”5/2h”,”5/3h”,”5/4h”,”5/5h”,until ...

Clustered Idempotent Consumer Pattern with Infinispan

I’ve created a small project that shows how to use JBoss Infinispan with Apache Camel and the Idempotent Consumer Pattern to guarantee a message will not be processed twice in ...

Pizza problem – builder vs decorator

Problem Statement We need to build the software for a pizza company who wants to prepare different types of pizzas, e.g Chicken Pizza, Flat Bread, Pepperoni Pizza with Extra Cheese, ...

jinfo: Command-line Peeking at JVM Runtime Configuration

In several recent blogs (in my reviews of the books Java EE 7 Performance Tuning and Optimization and WildFly Performance Tuning in particular), I have referenced my own past blog posts ...
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