Git Clone
git clone copies an entire remote repository locally. This guide covers shallow clones with --depth, cloning specific branches, submodules, SSH vs HTTPS, and fixing a Permission denied (publickey) error.
Apache Commons Collection – MultiValuedMap
Apache Commons Collections MultiValuedMap compared against Guava Multimap and a vanilla nested Map of Lists, with a realistic form-validation-errors use case, annotated code, sample output, and FAQs.
Git Init
git init creates a new local Git repository. This guide covers the basic command, setting main as the default branch name with -b and init.defaultBranch, and a full flag reference.
Geolocation API
The browser Geolocation API explained with the HTTPS-only requirement, navigator.permissions.query usage, and full error handling for all three PositionError cases, plus FAQs and See Also.
Setting up your Angular development environment
Hey there, fellow coders! Ever wanted to build amazing web applications with Angular but felt a bit overwhelmed by the setup process? Don't worry, you're not alone! Today, we're going to walk through setting up your local environment, making it as easy as pie. What You'll Need Before We Begin Before we jump into the nitty-gritty, let's make sure you're familiar with a few basics: JavaScript, HTML, and CSS: These are the building blocks of web development. A solid understanding of these will make your Angular journey much smoother. Command Line Interface (CLI): You'll be using commands in your terminal or command prompt. Don't worry, we'll guide you through them. TypeScript (Optional): Angular is built with TypeScript, which adds static typing to JavaScript. While it's helpful, you can start without deep knowledge. Let's Get Started: Dependencies and Installation 1. Node.js and npm: Angular CLI relies on Node.js and npm (Node Package Manager). Head over to the official Node.js (https://nodejs.org/en) website and download the latest LTS (Long Term Support) version by clicking Download Node.js button. Once it is downloaded, double click on the downloaded file to start its installation. Installing Node.js will automatically install npm. As stated in the angular documentation, it is important to use an active or maintenance LTS version of node.js. Please refer to the angular version compatibility guide for more details.
Spring Cloud: Getting started with Hystrix Dashboard
⚠️ This tutorial is outdated. Hystrix Dashboard was removed from Spring Cloud and does not work with Spring Boot 3.x. The modern approach is Resilience4j metrics with Prometheus & Grafana — see the Spring Cloud Netflix migration guide. This post remains online for teams maintaining legacy systems. This is a quick tutorial on Hystrix dashboard. Hystrix dashboard allows you to view the overall status of your Spring cloud application at a single glance. It provides access to vital metrics of your application and gives you a graphical representation of those for better understanding. This post is the continuation of Spring Cloud: Adding Hystrix Circuit Breaker and Spring Cloud: Playing with Hystrix Circuit Breaker. Please go through those post, if you haven't. Those posts explain about Hystrix circuit breaker. TL;DR You can download whole project by clicking following link. Spring Cloud (V2.3.1) Hystrix DashboardDownload
Spring Cloud Config Server on Spring Boot 3.x: Git Mode, Native Mode, and Runtime Refresh
Spring Cloud Config is, alongside Eureka, one of the two survivors of the original Spring Cloud stack — still maintained, still the standard answer for centralized configuration outside Kubernetes. This post is a complete rewrite of my 2020 Config Server tutorials for Spring Boot 3.x: a Config Server backed by Git (with native/filesystem mode for local development), clients using the modern spring.config.import mechanism instead of the long-gone bootstrap.properties, and runtime refresh that actually works.
Spring Cloud: Exploring Spring Cloud Config Server (Native Mode)
⚠️ This tutorial covers an old Spring Cloud version. Spring Cloud Config is still maintained, but this setup targets Spring Boot 2.x. For Spring Boot 3.x configuration (Git and native mode), see the updated Spring Cloud Config Server guide and the Spring Cloud Netflix migration guide. This is a quick tutorial on Spring Cloud Config Server. In brief, Spring cloud config allows you to have applications/micro-services configuration at a centralized place. Since we are working on spring micro-services, in production we may have hundreds of micro-services running together. Now if we want to manage configuration for hundreds of those micro-services then it would be a big pain if we do it manually. Instead, we will use Spring cloud config server to manage that configuration from a central place. TL;DR You can download whole project by clicking following link. Spring Cloud (V2.3.1) Config Server in Native ModeDownload Spring Cloud (V2.3.1) Sample Configuration for Config Server in Native ModeDownload
Spring Cloud: Adding Filters in Zuul Gateway
⚠️ This tutorial is outdated. Zuul 1 (including its filter model) was removed from Spring Cloud and does not work with Spring Boot 3.x. Filters are now written as Gateway filters — see the Zuul to Spring Cloud Gateway migration guide and the Spring Cloud Netflix migration guide. This post remains online for teams maintaining legacy systems. This tutorial is the continuation of Spring Cloud: Exploring Zuul Gateway tutorial. In this tutorial, we will be exploring the functionality of filters provided by Zuul. As discussed earlier Zuul provides various filters which we can use for request validation or processing. Let's say if you have an incoming request and if you want to check whether the user is authenticated or not, you can use Zuul pre-filter for this. If your request is processed and if you want to encrypt the response you can use Zuul post filter. The major upside of Zuul filter is, you can manage all of your filters at a centralized location. Zuul has provision to create following four types of filter. pre filters run before the request is routed.route filters can handle the actual routing of the request.post filters run after the request has been routed.error filters run if an error occurs while handling the request.
Spring Cloud: Exploring Zuul Gateway
⚠️ This tutorial is outdated. Zuul 1 was removed from Spring Cloud and does not work with Spring Boot 3.x. For current projects, use Spring Cloud Gateway — and see the Spring Cloud Netflix migration guide for the full modern stack. This post remains online for teams maintaining legacy systems. This is a quick tutorial for Spring cloud Zuul component. In this tutorial, we will explore Zuul functionality and will create a gateway to our Spring cloud environment using Zuul. What is Zuul? Zuul is a gateway component in Spring cloud ecosystem. It provides access to the services present in our Spring cloud from services/applications which are outside of our environment. Zuul creates a single entry point for our application which we can use from the outside world. In our environment, we might have 100's of services running, each one serving a special purpose. Now if we want to access those services via another network or from the internet, then exposing those 100 services will not be a great idea. In such cases, Zuul comes handy. It provides us with a single proxy to access those services. Apart from that Zuul also provides request filters. We can use those to check/process each and every request before it hits the actual service. TL;DR You can download whole project by clicking following link. Spring Cloud (V2.3.1) ZuulDownload