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Introduction to Bootique 1. Overview Bootique is a very lightweight open-source container-less JVM framework aimed to build next-generation scalable micro-services. It’s built on top of embedded Jetty server and fully supports REST handlers with jax-rs. In this article, we’ll show how to build a simple web application using Bootique. 2.… Continue Reading bootique
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Getting Started with Java Properties 1. Overview Most Java application need to use properties at some point, generally to store simple parameters as key-value pairs, outside of compiled code. And so the language has first class support for properties – the java.util.Properties – a utility class designed for handling this… Continue Reading java-properties
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The Java Native Keyword and Methods 1. Overview In this quick tutorial, we’ll discuss the concept of the native keyword in Java, and we’ll also show how to integrate native methods into Java code. 2. The native Keyword in Java First of all, let’s discuss what is a native keyword in Java. Simply put,… Continue Reading java-native
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Observable Utility Operators in RxJava 1. Overview In this article, we’ll discover some utility operators for working with Observables in RxJava and how to implement custom ones. An operator is a function that takes and alters the behavior of an upstream Observable<T> and returns a downstream Observable<R> or Subscriber, where… Continue Reading rxjava-observable-operators
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Avoid brittle tests for the Service layer Spring Testing Table of Contents 1. Overview 2. The Layers 3. Motivation and blurring the lines of the unit test 4. Conclusion 1. Overview There are many ways to test the Service Layer of an application. The goal of this article is to… Continue Reading testing-the-java-service-layer
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An Advanced Tagging Implementation with JPA 1. Overview Tagging is a Design Pattern that allows us to perform advanced filtering and sorting on our data. This article is a continuation of a Simple Tagging Implementation with JPA. Therefore, we’ll pick up where that article left off and cover advanced use… Continue Reading jpa-tagging-advanced
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Get the Key for a Value from a Java Map 1. Introduction In this quick tutorial, we’re going to demonstrate three different approaches for retrieving the key from a map for a given value. We’ll also discuss the positives and negatives of the various solutions. To learn more about the Map interface, you… Continue Reading java-map-key-from-value
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Modifying an XML Attribute in Java 1. Introduction One common activity when we are working with XML is working with its attributes. In this tutorial, we’ll explore how to modify an XML attribute using Java. 2. Dependencies In order to run our tests, we’ll need to add the JUnit and… Continue Reading java-modify-xml-attribute
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Spring Data JPA and Null Parameters 1. Overview In this article, we’ll show the ways of handling null parameters in Spring Data JPA. In some cases, when we search for records by parameters we want to find rows with null as the field value. Other times, we may want to… Continue Reading spring-data-jpa-null-parameters
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A Guide to Jdbi 1. Introduction In this article, we’re going to look at how to query a relational database with jdbi. Jdbi is an open source Java library (Apache license) that uses lambda expressions and reflection to provide a friendlier, higher level interface than JDBC to access the database.… Continue Reading jdbi
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