Articles

Spring Tips: Apache RocketMQ

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Hi, Spring fans! In this installment of Spring Tips, we’re going to look at Alibaba’s Apache RocketMQ. We’ve talked some about Alibaba in Spring Tips before. Check out the earlier Spring Tips installment in which we explore some of Spring Cloud Alibaba.

Running Apache RocketMQ

In order to use Apache RocketMQ, you’ll need to follow the steps in the RocketMQ quickstart. This Spring Tips installment introduces Apache RocketMQ, originally a technology developed and used internally at Alibaba and proven in the forge of 11/11, the famous Chinese sales holiday, sort of like “Cyber Monday,” or “Black Friday,” in the US. Sort of like that, but waaaaaay bigger. In 2019, Alibaba (alone, with no other e-commerce engines involved), made almost $40 billion USD in 24 hours. This required that trillions of messages be sent through something that could scale to meet the demand. RocketMQ is the only thing they could trust.

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DevOps Tutorial | DevOps With Docker, Kubernetes and Azure DevOps

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In this article, we focus our attention on the DevOps.

What is DevOps? How is it different from Agile? What are the popular DevOps Tools? What is the role of Docker, Kubernetes and Azure DevOps in DevOps. Let’s get started with a simple use case.

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Alexa Skill With Spring Boot

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You can build a custom skill for Alexa by extending a servlet that accepts requests from and sends responses to the Alexa service in the cloud.

This project will walk through how to build an Alexa Skill with Spring Boot and Http Servlet mapping examples.

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Spring ResourceLoaderAware Example

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In the video below, we take a closer look at a Spring ResourceLoaderAware example. Let’s get started!

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Application Monitoring with Spring boot Actuator

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Monitoring production is an important part of a software service provider. Many companies providing monitoring systems for maintaining the production environment. Spring Boot comes with different awesome modules that developers can easily configure and maintain development and production environments with. The actuator module provides production-ready features by which we can easily maintain the production environment. The actuator exposes JMX and HTTP endpoints.

Features

  • Endpoints: Spring Boot Actuator provides some default endpoints by which we can access application information. We can also monitor the production environment with those endpoints. Endpoints can also be accessed by third-party monitoring tools.
  • Metrics: We can access OS and JVM related information using spring boot actuator endpoints. This is very useful for runtime environment. Spring boot actuator provides this feature by integrating with micrometer application monitoring.
  • Audit: Spring Boot Actuator publishes events to  AuditEventRepository. Spring security by default publishes “authentication success,” “failure,” and “access denied” exceptions. This is a very useful feature for reporting and authentication failures. Auditing can be enabled by AuditEventRepository. By default, spring-boot provides InMemoryAuditEventRepository for auditing which has limited capabilities.
  • HTTP Tracing: Spring boot actuator also provides an HTTP tracing facility. If you want to use it you have to include web endpoint. Http tracing provides the information about request-response exchange.

Important Endpoints

Spring Boot Actuator provides the listed HTTP and JMX endpoint. We will discuss in detail later part of this article.

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A Simple, Yet Powerful Design Model to Manage Records

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Abstract

A user interface to create, read, update or delete records (CRUD) is an essential component of any computer system. The existing user interfaces and activities in record management can be further optimized. Some existing CRUD interfaces involve migrating to a few different pages with a different set of controls and different functionalities. This proposed model is developed to achieve all the functions related to record management on the same page with the same set of controls. This model can achieve all the CRUD functionality in a single page with the same set of controls using minimal interactions. This model ensures a higher level of user-friendliness with more efficient resource management. The proposed model can be extended easily to accommodate specific requirements in different situations.

Introduction

Several entities need to have CRUD functionality even in a simple software solution. The users may view records through the user interface. They may update the viewed record or delete that. The users also need to create new records. This functionality is currently achieved by different systems using a combination of pages. Each page involved has different components with different actions on each page. These systems could have been improved to achieve the same functionality in a simpler and more user-friendly manner. This article discusses a simple, yet powerful model to manage records and have a more user-friendly UI and fewer interactions to achieve the same CRUD operations. This proposed model can achieve all CRUD functions in a single page with the same set of control with minimal interactions.

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How to Implement Fuzzy Search (Google’s Autocomplete Search) in Java

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Approximate String Search

Approximate String Search, Fuzzy Search, search with mistakes — there are many names for this one problem. In this article, I’ll show you two ways to implement a search that takes potential misspelling into account. 

Example of the Problem

A user types a company name with a mistake: Tetla, Aptle, Cola Koca, Mikrosoft, and the application returns the correct company name and similar companies (if any exist): 

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Comparing Synchronous and Asynchronous Access to Postgres

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Quarkus supports imperative as well as reactive programming styles. In this article, I compare access times to Postgres from Java-based microservices developed with Quarkus. For synchronous invocations Panache is used, for asynchronous access Vert.x Axle.

I’ve created a sample application that comes with the cloud-native-starter project. The ‘articles’ microservice accesses the database running in Kubernetes. To keep the scenario simple, only one REST API is tested which reads articles from Postgres.

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How to Enable HTTPS on a Spring Boot Application

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HTTPS is a secure version of HTTP designed to provide Transport Layer Security (TLS) [the successor to Secure Sockets Layer (SSL)], the padlock icon in the address bar that establishes an encrypted connection between a web server and a browser. HTTPS encrypts every data packet to transmit in a secure way and protects sensitive data from an eavesdropper or hacker.

You can implement HTTPS by installing the SSL certificates on your web application. You can use either certificate issued by trusted Certificate Authorities (CA) or Self-Signed Certificate.

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Easy OAuth 2.0 Single Sign-on in Java

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Different applications need different permissions. Although you might have a single resource server providing data to multiple apps, it’s often the case that you don’t want all users of application A to access application B. 

In this tutorial, you’ll learn how to use Okta and Spring Boot to implement SSO with two client applications and a single resource server. You’ll also learn how to restrict access to the resource server based on app scores and how to use access policies to enforce authentication and authorization rules.

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