In 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 be discoverable by other Microservices. For a step by step series of video lessons, please check this page: Spring Boot Microservices and Spring Cloud. Create a New Spring Boot…
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 BootIn this tutorial, we will build a Spring Boot application which demonstrates how to 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…
Read More Spring Boot and MongoTemplate Tutorial with MongoDBIn this tutorial, you will learn how to implement pagination in your RESTful Web Services app built with Spring Boot. The code example below will demonstrate how to implement pagination to implement “Get a list of users” registered with our app feature. I assume you already have your Spring Boot RESTful Web Service built but…
Read More Pagination Tutorial with Spring Boot RESTAlmost in every RESTful Web Service application, I have to do the DTO to Entity and then Entity to DTO conversion. DTO stands for Data Transfer Object and is a simple Plain Old Java Object which contains class properties and getters and settings methods for accessing those properties. In this blog post, I am going…
Read More DTO to Entity and Entity to DTO ConversionWith 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 LoggerFactoryWith this short blog post, I am going to share with you how to add Spring Security to your project so that we can use Spring Security to encrypt user password. I assume you already have your project created with Spring and in case you have not check out my blog post on “Create a…
Read More Encrypt User Password with Spring SecurityIn this short blog post, I will share with you how to add MySQL support to your Spring Boot Web app, and with Spring Boot, it is very easy. If you are interested to learn how to add the JPA and MySQL support to your Spring Boot Web app and learn how to implement a…
Read More Add MySQL Support to Spring Boot Web AppWith this blog post, I am going to share with you how to run a Spring Boot app from a command line in a Terminal window. There are a couple of ways and both assume that you have already created your Spring Boot app. To learn how to create a new Spring Boot app please…
Read More Run Spring Boot App from a Command LineWhen building RESTful Web Services with Spring Boot, we can either package our Spring Boot App as an executable JAR file and run it with built-in Tomcat, or we can create a deployable WAR file and then deploy it into a stand along Tomcat or Jetty. With this blog post, I will share how to edit…
Read More Create a Deployable WAR File with Spring BootIn this blog post, I will share how to create a very simple RESTful Spring Boot Web Service that uses Spring Data JPA to save information to a database. Our Web Service will accept HTTP Post requests with user details and then save these user details into MySQL Database using Spring Data JPA CrudRepository. For code…
Read More Spring Boot REST and JPA – Save to a Database