In 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 LineIn this blog post, I will share how to copy properties from a DTO object to an Entity object and then back from an Entity object to a DTO object. DTO stands for Data Transfer Object, and it is a simple, Plain Old Java Object that typically contains class properties and getter and setter methods…
Read More DTO to Entity Conversion in JavaSpring is a popular Java-based framework for building applications. One of its core features is dependency injection, which is used to manage the relationships between objects and to make it easier to manage the dependencies in an application. In this tutorial, we will explore two of the main methods of dependency injection in Spring: constructor…
Read More Constructor vs Field Dependency Injection in SpringDependency Injection is a design pattern that allows the separation of concerns in an application by removing the hard-coded dependencies between objects. In Dependency Injection, the objects are provided with their dependencies instead of having to hard-code them. This makes the application more flexible, maintainable, and easier to test. Spring Framework provides several ways to…
Read More Field-based Dependency Injection in SpringCore Spring Framework Annotations are a set of annotations that are used to simplify the development process of Java applications using the Spring Framework. These annotations can be used to inject dependencies, define components, and specify configuration details without the need for explicit XML configuration. Some of the most commonly used Core Spring Framework Annotations…
Read More Spring Core Annotations with Examples@Configuration is a Spring annotation that indicates that a class declares one or more @Bean methods and may be processed by the Spring container to generate bean definitions and service requests for those beans at runtime, for example: @Configuration public class AppConfig { @Bean public MyService myService() { return new MyServiceImpl(); } } Here, the…
Read More @Configuration Annotation in Spring BootIn this tutorial, we’ll learn what IoC (Inversion of Control) and DI (Dependency Injection) are, as well as take a look at how these are implemented in the Spring framework. What Is Inversion of Control (IoC)? Inversion of Control is a principle in software engineering that separates the control of objects or how parts of…
Read More Dependency Injection and Inversion of Control in SpringIn this tutorial, you will learn how to start up your own Spring Cloud API Gateway and how to make it route HTTP Requests sent to a registered with Eureka Discovery Server Microservice. I will also show you how to register more than one Spring Boot Microservice with Eureka and how to configure your Spring…
Read More Spring Cloud API Gateway TutorialIn this tutorial, you will learn how to startup your own Eureka Discovery Server, so that the Microservices you build can register with this server and become discoverable by other Microservices. To learn how to setup Eureka Cluster, read the Eureka Server Cluster Setup tutorial. For a step by step series of video lessons, please…
Read More Eureka Discovery Server TutorialIn this short tutorial, I am going to share with you how to enable CrossOrigin in a RESTful Web Service API built with Spring Boot that also has Spring Security enabled. Enable CrossOrigin for Specific Endpoint To enable cross-origin AJAX HTTP requests to a specific RESTful Web Service endpoint in our Rest Controller class we can use…
Read More CrossOrigin and CORS in RESTful Web ServiceIn this tutorial, we will create a Spring Boot application which demonstrates how we can add and use the H2 in-memory database in our application. You will learn how an in-memory database like H2 can be used to develop a Spring boot application without the overhead of doing DB configuration on your machine and without…
Read More Using H2 In-memory Database in Spring BootThis tutorial will teach you how to build a Spring Boot application and access data in a MongoDB database using the MongoTemplate APIs. For MongoDB, we will use mLab, which provides MongoDB Database as a Service platform so that you don’t even have to install a MongoDB database on your computer. Also, at the end…
Read More Spring Boot and MongoTemplate Tutorial with MongoDBIn this tutorial, you will learn how to implement pagination in your RESTful Web Services application built with Spring Boot. The code example below will demonstrate how to implement pagination for the API endpoint that returns a list of users. I assume you already have your Spring Boot RESTful Web Service built, but if you…
Read More Pagination Tutorial with Spring Boot RESTWith this Spring Boot tutorial, I will share how to handle exceptions in your RESTful Web Service application build with Spring Boot. Read the “Handling Exceptions in Project Reactor” tutorial if you use a project reactor. And to learn how to test your code for Exceptions, read the “Test for Exceptions with the JUnit” tutorial. What…
Read More Handle Exceptions in Spring Boot RESTful ServiceAdding logging support to your RESTful Web Service application with Spring Boot is extremely simple. To use Spring Boot logging, you do not need to add any additional dependencies or libraries to your web app project other than the spring-boot-starter-web dependency. If you are working on a Spring Boot Web or a Web Services project, you…
Read More Spring Boot Logging with LoggerFactory