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Remove Emojis from a Java String
1. Overview Emojis are becoming more popular in text messaging these days – sometimes we need to clean our text from them and other symbols. In this tutorial, we’ll discuss different ways to remove...
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Calculate the Distance Between Two Points in Java
1. Overview In this quick tutorial, we’ll show how to calculate the distance between two points in Java. 2. The Math Formula of the Distance Let’s say we have two points on a plane: the first point A...
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Java Weekly, Issue 245
Here we go… 1. Spring and Java >> Bootiful GCP: Integration with Google Cloud Pub/Sub (4/8) [spring.io] >> Bootiful GCP: Runtime Configuration with Spring Cloud GCP Runtime Config (5/8)...
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An Intro to Vault
1. Overview In this tutorial, we’ll explore Hashicorp’s Vault – a popular tool used to securely manage sensitive information in modern application architectures. The main topics we’ll cover, include:...
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How to Disable Console Logging in Spring Boot
1. Overview Usually, console logs give us the opportunity to debug our system in an easy and intuitive way. Nevertheless, there are occasions when we don’t want to enable this feature in our system....
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Convert java.util.Date to String
1. Overview In this tutorial, we’ll show how we can convert Date objects to String objects in Java. To do so, we’ll work with the older java.util.Date type as well as with the new Date/Time API...
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Server-Sent Events in Spring
1. Overview In this tutorial, we’ll see how we can implement Server-Sent-Events-based APIs with Spring. Simply put, Server-Sent-Events, or SSE for short, is an HTTP standard that allows a web...
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DDD Aggregates and @DomainEvents
1. Overview In this tutorial, we’ll explain how to use @DomainEvents annotation and AbstractAggregateRoot class to conveniently publish and handle domain events produced by aggregate – one of the key...
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Permgen vs Metaspace in Java
1. Introduction In this quick tutorial, we’re going to examine the differences between the PermGen and Metaspace memory regions in the Java environment. It’s important to keep in mind that, starting...
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Spring WebSockets: Build an User Chat
1. Introduction In this tutorial, we’ll describe how to use Spring WebSockets to send STOMP messages to a single user. That’s important because we sometimes don’t want to broadcast every message to...
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Guide to Java EE JTA
1. Overview Java Transaction API, more commonly known as JTA, is an API for managing transactions in Java. It allows us to start, commit and rollback transactions in a resource-agnostic way. The true...
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Spring Vault
1. Overview HashiCorp’s Vault is a tool to store and secure secrets. Vault, in general, solves the software development security problem of how to manage secrets. To learn more about it, check out our...
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OAuth2 – @EnableResourceServer vs @EnableOAuth2Sso
1. Overview In this tutorial, we’re going to talk about the @EnableResourceServer and @EnableOAuth2Sso annotations in Spring Security. We’ll begin by explaining the differences between an OAuth2...
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Using Lombok’s @Getter for Boolean Fields
1. Introduction Project Lombok is a popular library for reducing Java boilerplate. In this tutorial, we’ll take a look at how Lombok’s @Getter annotation works on boolean fields to remove the need to...
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Introduction to Kovenant Library for Kotlin
1. Introduction Promises are a fantastic way to manage asynchronous code, like where we need a response but are willing to wait for it to be available. In this tutorial, we’re going to see how...
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Spring Security – Whitelist IP Range
1. Overview In this tutorial, we’ll discuss how to whitelist IP ranges in Spring Security. We’ll take a look at both Java and XML configurations. We’ll also see how to whitelist IP range using a...
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Ratpack HTTP Client
1. Introduction Over the last several years, we’ve witnessed the rise of the functional and reactive way of creating applications in Java. Ratpack offers a way of creating HTTP applications along the...
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A Guide to OptaPlanner
1. Introduction to OptaPlanner In this guide, we look at a Java constraint satisfaction solver called OptaPlanner. OptaPlanner solves planning problems using a suite of algorithms with minimal setup....
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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...
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Java Weekly, Issue 246
Here we go… 1. Spring and Java >> Bootiful GCP: Supporting Observability with Spring Cloud GCP Stackdriver Trace (6/8) [spring.io] >> Bootiful GCP: Use Spring Cloud GCP to Connect to Other...
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