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Introduction to Spring Boot CLI
1. Introduction Spring Boot CLI is a command-line abstraction that allows us to easily run Spring micro-services expressed as Groovy scripts. It also provides simplified and enhanced dependency...
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A Guide to the JSTL Library
1. Overview JavaServer Pages Tag Library (JSTL) is a set of tags that can be used for implementing some common operations such as looping, conditional formatting, and others. In this tutorial, we’ll...
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Java Weekly, Issue 224
Here we go… 1. Spring and Java >> Monitor and troubleshoot Java applications and services with Datadog Optimize performance with end-to-end tracing and out-of-the-box support for popular Java...
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Finding Min/Max in an Array
1. Introduction In this short tutorial, we’re going to see how to find the maximum and the minimum values in an array, using Java 8’s Stream API. We’ll start by finding the minimum in an array of...
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Quick Guide to java.lang.System
1. Overview In this tutorial, we’ll take a quick look at the java.lang.System class and its features and core functionality. 2. IO System is a part of java.lang, and one of its main features is to...
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Assert an Exception is Thrown in JUnit 4 and 5
1. Introduction In this quick tutorial, we’ll be looking at how to test if an exception was thrown, using JUnit library. Of course, we’ll make sure to cover both the JUnit 4 and JUnit 5 versions. 2....
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@Lookup Annotation in Spring
1. Introduction In this quick tutorial, we’ll take a look at Spring’s method-level dependency injection support, via the @Lookup annotation. 2. Why @Lookup? A method annotated with @Lookup tells...
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Spring Boot: Customize Whitelabel Error Page
1. Overview In this article, we’re going to look at how to disable and customize the default error page for a Spring Boot application as proper error handling depicts professionalism and quality work....
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Internationalization and Localization in Java 8
1. Overview Internationalization is a process of preparing an application to support various linguistic, regional, cultural or political-specific data. It is an essential aspect of any modern...
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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...
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Java List UnsupportedOperationException
1. Overview In this quick tutorial, we’ll discuss a common Exception that can occur when working with some the API of most List implementations – the UnsupportedOperationException. A java.util.List...
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Conditionals in Thymeleaf
1. Overview In this tutorial, we’re going to have a look at the different types of conditionals available in Thymeleaf. For a quick introduction to Thymeleaf, please refer to this article. 2. Maven...
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Working with Fragments in Thymeleaf
1. Overview In this tutorial, we’ll show how to make use of Thymeleaf Fragments to reuse some common parts of a site. After setting up a very simple Spring MVC project, we’ll focus on views. If you’re...
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Spring Boot Change Context Path
1. Overview Spring Boot, by default, serves content on the root context path (“/”). And while, usually, it’s a good idea to prefer convention over configuration, there are cases when we do want to...
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@Before vs @BeforeClass vs @BeforeEach vs @BeforeAll
1. Introduction In this short tutorial, we’re going to explain the differences between the @Before, @BeforeClass, @BeforeEach and @BeforeAll annotations in JUnit 4 and 5 – with practical examples of...
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Facade Design Pattern in Java
1. Introduction In this quick tutorial, we’re going to take a look at one of the structural design patterns: the Facade. First, we’ll give an overview of the pattern, list its benefits and describe...
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Servlet Redirect vs Forward
1. Overview Occasionally, the initial HTTP Request Handler in our Java Servlet needs to delegate the Request to another resource. In these cases, we can either forward the request further or redirect...
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Spring Boot: Configuring a Main Class
1. Overview This quick tutorial provides different ways of defining an entry point into a Spring Boot application via Maven and Gradle. A Spring Boot application’s main class is a class that contains...
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Obtaining Auto-generated Keys in Spring JDBC
1. Introduction In this quick tutorial, we’ll explore the possibility of getting the auto-generated key after inserting entities when working with Spring JDBC. 2. Maven Dependencies At first, we need...
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Using the JetS3t Java Client With Amazon S3
1. Overview In this tutorial, we’ll use the JetS3t library with Amazon S3. Simply put, we’ll create buckets, write data to them, read data back, copy it, and then list and delete them. 2. JetS3t Setup...
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