In this tutorial, I will walk you through how to build multi-container applications using Docker Compose. This is a beginner-friendly guide that explains everything you need to know to get started. You will learn how to create a web application with Spring Boot that uses MySQL as a database server. We will also discuss how…
Read More Building Multi-Container Application with Docker Compose: A Beginners’ GuideIn this tutorial you will learn how to enable and how to view Spring Cloud API Gateway Routes using Spring Boot Actuator. Developers use Actuator to enable API Gateway routes in order to keep track of the routes being used in their application. By exposing these routes through Actuator endpoints, developers can get valuable information…
Read More Viewing Spring Cloud API Gateway Routes with Spring Boot ActuatorIn a microservices architecture, it is common to have multiple services communicating with each other over the network. This distributed nature of the architecture can make it challenging to diagnose and debug issues when they arise. To address this problem, developers often use monitoring(Micrometer) and tracing tools(Zipkin) to track the flow of requests between microservices.…
Read More Micrometer and Zipkin: How to Trace HTTP Requests in Spring Boot 3class UserIdComparator implements Comparator<User> { public int compare(User user1, User user2) { if (user1.userId == user2.userId) { return 0; } else if (user1.userId > user2.userId) { return 1; } else { return -1; } } } We will now create a UsernameComparator class that establishes the comparison logic based on the username field. This class…
Read More Comparator interface in JavaThe RestTemplate class within the Spring Framework is a simple HTTP client that enables your code to send HTTP requests and handle HTTP responses. This tutorial will demonstrate how to use RestTemplate to send various types of HTTP requests. Create Spring Boot App RestTemplate is a component of the Spring Framework and is typically utilized…
Read More Spring RestTemplate TutorialIn this tutorial, you will learn how to enable OpenAPI(Swagger) in your Spring Boot version 3 application. What is OpenAPI? OpenAPI (formerly known as Swagger) is a specification for building and documenting RESTful APIs. It allows developers to describe their API operations, inputs, outputs, and other aspects in a structured and machine-readable format. This documentation…
Read More Enable OpenAPI 3(Swagger) in Spring Boot 3In this blog post, I will share how to run a Spring Boot app from the command line in a Terminal window. There are a couple of ways to do this, and both assume that you have already created your Spring Boot app. If you need help creating a new Spring Boot app, please check…
Read More How to Run Spring Boot App via Command LineThis short REST Assured tutorial will teach you how to validate the HTTP Response Status Code while testing a RESTful Web Service endpoint. Each HTTP Response includes a status code, and by examining the status code value, we can determine if the HTTP Response was successful or not. Let’s explore how we can use REST…
Read More Validate HTTP Status Code: RestAssuredIn this tutorial, we will explore how to use the Java HttpClient to upload a file to the server. In the next tutorial, we will cover how to configure HttpClient to accept all SSL certificates. Let’s get started! In the code example below, we will use the Apache HttpClient and the MultipartEntityBuilder. HttpClient Maven Dependencies…
Read More Java File Upload using HttpClientIn order to simulate the behaviour of any argument of the specified type during unit testing, we can utilize Mockito argument matchers. In this tutorial, we’ll discuss an Introduction to the Mockito Argument Matchers along with some examples and the creation of a custom argument matcher. So, let’s begin! If you are not familiar with…
Read More Mockito Argument Matchers: Examples and UsageThis tutorial will guide you on how to incorporate JUnit support into your Spring Boot application based on Maven. Spring Boot Starter Test Dependency To add JUnit and Mockito support to your Maven-based Spring Boot application, include the following dependencies in the <dependencies> section of your pom.xml file: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> By adding…
Read More JUnit Support in Spring BootIn the software development process, testing is essential. There are two types of testing i.e. unit testing and integration testing. While unit testing focuses on testing the smallest component of an application, integration testing focuses on testing the end-to-end behavior of the application also known as endpoint testing. Integration testing verifies the @Controller and @RestController…
Read More Testing Spring Boot Applications with MockMvcThis tutorial guides you through writing type-safe queries in Java using jOOQ (Java Object Oriented Query). You’ll get a quick tour of jOOQ by running an application and seeing how it generates database tables from Java classes. With its smooth API, jOOQ also helps you create type-safe SQL queries. jOOQ vs JPA jOOQ is a…
Read More Type Safe SQL Queries in Java with jOOQA test suite is a collection of test cases that are run together as a single unit. It helps to organize and manage the execution of multiple test cases. Test suites can be used to group related tests or to test different aspects of a complex system. They can also be used to run tests…
Read More JUnit 5 Test Suite TutorialThis tutorial will teach you how to use project Lombok in the Spring Boot application. Overview No doubt Java is a wonderful language, but one of the drawbacks of Java is its verbose nature. This makes it fairly complicated for everyday tasks such as composing a simple POJO object. For example, constructing of methods like Getters(), Setters(),…
Read More How to use Project Lombok in Spring Boot