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Permutations of an Array in Java 1. Introduction In this article, we’ll look at how to create permutations of an array. First, we’ll define what a permutation is. Second, we’ll look at some constraints. And third, we’ll look at three ways to calculate them: recursively, iteratively, and randomly. We’ll focus on… Continue Reading java-array-permutations
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Batch Processing in JDBC 1. Introduction Java Database Connectivity (JDBC) is a Java API used for interacting with databases. Batch processing groups multiple queries into one unit and passes it in a single network trip to a database. In this article, we’ll discover how JDBC can be used for batch… Continue Reading jdbc-batch-processing
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The Maven Failsafe Plugin 1. Overview This to-the-point tutorial describes the failsafe plugin, one of the core plugins of the Maven build tool. For an overview of the other core plugins, refer to this article. 2. Plugin Goals The failsafe plugin is used for integration tests of a project. It has… Continue Reading maven-failsafe-plugin
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An Introduction to ThreadLocal in Java 1. Overview In this article, we will be looking at the ThreadLocal construct from the java.lang package. This gives us the ability to store data individually for the current thread – and simply wrap it within a special type of object. 2. ThreadLocal API… Continue Reading java-threadlocal
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Introduction to Java Microservices with MSF4J 1. Overview In this tutorial, we’ll showcase microservices development using the MSF4J framework. This is a lightweight tool which provides an easy way to build a wide variety of services focused on high performance. 2. Maven Dependencies We’ll need a bit more Maven configuration than usual… Continue Reading msf4j
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Introduction to RxKotlin 1. Overview In this tutorial, we’re going to review the use of Reactive Extensions (Rx) in idiomatic Kotlin using the RxKotlin library. RxKotlin is not an implementation of Reactive Extensions, per se. Instead, it’s mostly a collection of extension methods. That is, RxKotlin augments the RxJava library… Continue Reading rxkotlin
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Convert Latitude and Longitude to a 2D Point in Java 1. Overview When implementing applications that use maps, we will typically run into the problem of coordinate conversion. Most of the time, we need to convert latitude and longitude to a 2D point to display. Fortunately, to solve this problem,… Continue Reading java-convert-latitude-longitude
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Scheduling in Spring with Quartz 1. Overview In this tutorial we’ll build a simple Scheduler in Spring with Quartz. We’ll begin with a simple goal in mind – to easily configure a new scheduled job. 1.1. Key Components of the Quartz API Quartz has a modular architecture. It consists of… Continue Reading spring-quartz-schedule
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Multipart Upload with HttpClient 4 1. Overview In this tutorial, we will illustrate how to do a multipart upload operation using HttpClient 4. We’ll use http://echo.200please.com as a test server because it’s public and it accepts most types of content. If you want to dig deeper and learn other cool… Continue Reading httpclient-multipart-upload
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Java System.getProperty vs System.getenv DevOps Java 1. Introduction The package java.lang is automatically imported when in a Java application. This package contains many commonly used classes from NullPointerException to Object, Math, and String. The java.lang.System class is a final class, meaning that we cannot subclass it, therefore all methods are… Continue Reading java-system-get-property-vs-system-getenv
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