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InputStream to String in Kotlin 1. Overview In this brief tutorial, we’ll find out how to read an InputStream into a String. Kotlin provides an easy way to perform the conversion. However, there are still some nuances to consider when working with resources. Plus, we’ll cover special cases, like reading up… Continue Reading kotlin-inputstream-to-string
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Java 11 String API Additions 1. Introduction Java 11 added few useful APIs to the commonly used String class. In this tutorial, we will explore and use these new APIs. 2. repeat() As the name suggests, the repeat() instance method repeats the string content. It returns a string whose value is… Continue Reading java-11-string-api
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Using the @Singular Annotation with Lombok Builders 1. Overview The Lombok library provides a great way of simplifying data objects. One of the key features of Project Lombok is the @Builder annotation, which automatically creates Builder classes for creating immutable objects. However, populating collections in our objects can be clumsy… Continue Reading lombok-builder-singular
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Guide to Guava Multimap 1. Overview In this article, we will look at one of Map implementations from Google Guava library – Multimap. It is a collection that maps keys to values, similar to java.util.Map, but in which each key may be associated with multiple values. 2. Maven Dependency First,… Continue Reading guava-multimap
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Calculate Factorial in Java 1. Overview Given a non-negative integer n, factorial is the product of all positive integers less than or equal to n. In this quick tutorial, we’ll explore different ways to calculate factorial for a given number in Java. 2. Factorial for Numbers up to 20 ====… Continue Reading java-calculate-factorial
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The Command Pattern in Java 1. Overview The command pattern is a behavioral design pattern and is part of the GoF‘s formal list of design patterns. Simply put, the pattern intends to encapsulate in an object all the data required for performing a given action (command), including what method to call,… Continue Reading java-command-pattern
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How to Find an Exception’s Root Cause in Java 1. Introduction It’s pretty common in Java to work with nested exceptions as they can help us track the source of an error. When we deal with these kinds of exceptions, sometimes we may want to know the original problem that… Continue Reading java-exception-root-cause
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Merging Two Maps with Java 8 1. Introduction In this quick tutorial, we’ll demonstrate how to merge two maps using the Java 8 capabilities. To be more specific, we’ll examine different merging scenarios including maps having duplicate entries. 2. Initialization As a start, let’s define two Map instances: private static… Continue Reading java-merge-maps
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A Quick Guide to the JVM Languages 1. Introduction Besides Java, other languages can run on the Java Virtual Machine like Scala, Kotlin, Groovy, Clojure. In the following sections, we’ll take a high-level look at the most popular JVM languages. Of course, we’ll start with the forerunner of JVM languages… Continue Reading jvm-languages
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Multiple Authentication Providers in Spring Security 1. Overview In this quick article, we’re going to focus on using multiple mechanisms to authenticate users in Spring Security. We’ll do that by configuring multiple authentication providers. 2. Authentication Providers An AuthenticationProvider is an abstraction for fetching user information from a specific repository… Continue Reading spring-security-multiple-auth-providers
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