To create a custom email validation in Spring Boot, you can follow these steps: Create a Custom Annotation for Email Validation. Create a Validator Class to Implement the Validation Logic. Use the Custom Annotation in Your Model Class. Let’s walk through the process step by step. Step 1: Create a Custom Annotation First, you need […]

Here are examples of each common Big O notation represented with Java for loops. These examples showcase different growth rates based on the structure of the loops. 1. O(1) – Constant Time This is a constant-time example, where the code runs in the same amount of time regardless of the size of the input.

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Dependency Injection (DI) is a core concept in Spring Framework and Spring Boot, which facilitates loose coupling between different components of an application. In simple terms, Dependency Injection allows Spring to manage the objects and their dependencies, instead of manually creating and managing them in the code. This makes the application more modular, testable, and […]

Lombok is a popular library in the Java ecosystem that helps to reduce boilerplate code in Java classes. It achieves this by providing annotations that automatically generate code during compilation. Some of the common tasks that Lombok simplifies include generating getters, setters, constructors, toString, equals, hashCode, and more. Here’s a brief overview of some of […]

The "rest-query-engine" you’re referring to is likely the "rest-query-engine" library created by Paul V. Rutledge and hosted on GitHub at the following URL: com.github.rutledgepaulv/rest-query-engine. This library provides a way to programmatically construct queries for RESTful APIs, particularly for filtering, sorting, and pagination. It’s commonly used in Java-based projects to build dynamic queries for interacting with […]

Creating a REST API in Spring Boot is a straightforward process, thanks to Spring Boot’s powerful features and built-in support for RESTful services. In this guide, I will walk you through creating a simple REST API that interacts with a database (in-memory H2 database) to manage user data. Steps to Create a REST API in […]

In the context of a Spring Boot application, a service class typically represents the layer responsible for implementing business logic and coordinating transactions between multiple repositories or external services. Here’s a more detailed explanation: Responsibilities: Implementing business logic: Service classes contain methods that encapsulate the business logic of the application. This logic may involve processing […]

In the context of a Spring Boot application, a repository class serves as an interface between the application’s business logic and the underlying data storage mechanism, typically a database. Here’s a more detailed explanation: Responsibilities: Data access: The primary responsibility of a repository class is to provide methods for performing CRUD (Create, Read, Update, Delete) […]

@Component is a Spring Framework annotation used to indicate that a class is a Spring-managed component. Spring components are objects managed by the Spring IoC (Inversion of Control) container, which handles their lifecycle, configuration, and dependency injection. Here’s what you need to know about @Component: Bean Definition: When you annotate a class with @Component, Spring […]

Let’s go through the annotations used in the provided Spring Boot application and explain them along with some additional values that can be passed into them: @SpringBootApplication: Explanation: This annotation is a combination of multiple Spring annotations, including @Configuration, @EnableAutoConfiguration, and @ComponentScan. It is used to mark the main class of a Spring Boot application. […]