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Jersey MVC Support
1. Overview Jersey is an open-source framework for developing RESTFul Web Services. As well as serving as the JAX-RS reference implementation it also includes a number of extensions to further...
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Introduction to Hazelcast Jet
1. Introduction In this tutorial, we’ll learn about Hazelcast Jet. It’s a distributed data processing engine provided by Hazelcast, Inc. and is built on top of Hazelcast IMDG If you want to learn...
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State Design Pattern in Java
1. Overview In this tutorial, we’ll introduce one of the behavioral GoF design patterns – the State pattern. At first, we’ll give an overview of its purpose and explain the problem it tries to solve....
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Kotlin Constructors
1. Overview In this tutorial, we’ll take a thorough look at constructors in Kotlin. Let’s start with a quick recap of the concept: we use constructors to create objects. These look like method...
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Creational Design Patterns in Kotlin: Builder
1. Introduction In this quick article, we’ll see how to implement the Builder Design Pattern in Kotlin. 2. Builder Pattern The Builder pattern is the one that people often use but rarely create on...
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Initialize a HashMap in Java
1. Overview In this tutorial, we’ll learn about various ways of initializing a HashMap in Java. We’lluse Java 8 as well as Java 9. 2. The Static Initializer for a static HashMap We can initialize a...
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Read a File into an ArrayList
1. Overview In this tutorial, we’ll discuss different ways of reading a file into an ArrayList. There are many ways to read a file in Java. Once we read a file, we can perform a lot of operations on...
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Maven Project with Multiple Source Directories
1. Introduction We sometimes need to use multiple source directories in a Java project. A common case example when there are classes that are generated automatically and placed in a different...
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Running JUnit Tests in Parallel with Maven
1. Introduction Although executing tests serially works just fine most of the times. Sometimes we may need to speed things up. In these situations, parallel tests can help. JUnit 4.7 and later...
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Kotlin Nested and Inner Classes
1. Introduction In this tutorial, we’ll look at four ways to create nested and inner classes in Kotlin. 2. Quick Comparison to Java For those thinking about Java nested classes, let’s do a quick...
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Performance of contains() in a HashSet vs ArrayList
1. Introduction In this quick guide, we’re going to discuss the performance of the contains() method available in java.util.HashSet and java.util.ArrayList. They are both collections for storing and...
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Differences Between Final, Finally and Finalize in Java
1. Overview In this tutorial, we’re going to take an overview of three Java keywords: final, finally and finalize. While these keywords resemble each other each has a very different meaning in Java....
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Static and Dynamic Binding in Java
1. Introduction Polymorphism allows an object to take multiple forms – when a method exhibits polymorphism, the compiler has to map the name of the method to the final implementation. If it’s mapped...
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Java List Initialization in One Line
1. Introduction In this quick tutorial, we’ll investigate how can we initialize a List using one-liners. 2. Create From an Array We can create a List from an array and thanks to array literals we can...
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Deploy a WAR File in JBoss
1. Introduction In this tutorial, we’re going to have a look at how to deploy a war file on the JBoss server. We can deploy the war file either by placing the file in the suitable directory manually...
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Java Weekly, Issue 242
Here we go… 1. Spring and Java >> Simplifying packaging Spring Boot 2 applications into Docker images using Google’s Jib [tech.asimio.net] A nice write-up about this handy Maven plugin that lets...
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An Overview of Regular Expressions Performance in Java
1. Overview In this quick tutorial, we’ll show how the pattern-matching engine works. We’ll also present different ways to optimize regular expressions in Java. For an introduction to the use of...
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Overview of JSON Pointer
1. Overview In this tutorial, we’ll show how to use JSON Pointer to navigate and fetch information from JSON data. We’ll also show how to perform operations such as inserting new data or updating...
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Tomcat Configuration In Eclipse
1. Overview One of the key challenges of web development is being able to debug effectively when running on web servers. Since building, packaging, and deploying consumes a lot of time, this might be...
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Java Constructors vs Static Factory Methods
1. Overview Java constructors are the default mechanism for getting fully-initialized class instances. After all, they provide all the infrastructure required for injecting dependencies, either...
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