Reactive Programming, a powerful paradigm in modern software development, revolutionizes the way we handle data and events. By embracing reactive principles, developers can build highly responsive and scalable applications. In this tutorial, we will explore the fundamentals of Reactive Programming, its benefits, common use cases, and delve into real-world examples to demonstrate its practical applications.…
Read More Introduction to Reactive ProgrammingTesting is an essential skill for any Java developer. It helps you ensure the quality and reliability of your code, as well as find and fix bugs faster. On this page, you will find a collection of tutorials that will teach you how to test Java code using JUnit 5 and Mockito. JUnit 5 is…
Read More Testing Java CodeIn this REST Assured tutorial, I will demonstrate how to evaluate the JSON content that is returned in the response body of an HTTP response. What is REST Assured? REST Assured is a Java-based library for testing RESTful web services. It provides a domain-specific language (DSL) for writing tests that interact with web services using…
Read More Validate JSON Response with REST AssuredIn Spring Boot 3, the authorizeRequests() method of the WebSecurityConfigurerAdapter class has been deprecated. This method was previously used to configure the authorization rules for securing web applications. To secure your application in Spring Boot 3 using Spring Security, you should use the HttpSecurity class and its authorizeHttpRequests() method instead. You can use the authorizeHttpRequests() method…
Read More Migrating from a Deprecated autorizeRequests()This tutorial will teach you how to leverage RestTemplate to access RESTful APIs protected by basic authentication. You will learn to create a Basic Authentication-secured REST API and access it via RestTemplate. What is Basic Authentication As the name suggests, it is a basic form of authentication in which we must provide the correct username…
Read More RestTemplate Example with Basic AuthenticationIn this tutorial, I’ll guide you on how to use the new OAuth2 Authorization Server(v0.0.3) built by the Spring Team. Below are the new features that have been introduced in the newer version: Enforce one-time use for authorization code Introduce OAuth2 Tokens Add Refresh Token grant Implement Token Revocation Endpoint OAuth2 is an authorization method…
Read More The New OAuth2 Authorization ServerWhat do you want to learn today? OAuth 2 Recent Tutorials Spring Security OAuth 2 Social Logout Sergey Kargopolov Keycloak | OAuth 2 In this short tutorial, you will learn how to configure the /logout functionality in your Spring Boot Web application that uses OAuth2 Social Login. To Read More Spring Security OAuth 2 Social…
Read More OAuth 2In this tutorial, you will learn how to use @AuthenticationPrincipal annotation to get the Jwt object containing the details of a provided in HTTP Request access token. When we send a request containing an access token in the Authorization header, behind the scenes, Spring Framework will do a lot of work and if all is good,…
Read More @AuthenticationPrincipal – Getting the Jwt ClaimsIn this tutorial, you will learn how to implement a very simple OAuth2 Resource Server that will validate the JWT token it has earlier acquired from a Keycloak authorization server. I this tutorial I will not show how to acquire the JWT access token but if you are interested to learn how to do it,…
Read More OAuth 2 Resource Server and KeycloakIn this tutorial, I am going to share with you how to allow access to your Microservice from an IP address of Zuul API Gateway only. For a step by step series of video lessons, please check this page: Spring Boot Microservices and Spring Cloud. In my previous tutorial, I have shared with you how…
Read More Allow Only IP Address of Zuul API GatewayIf you are working on a REST API for your project and you need to document it so that you can share API documentation with other team members or external to your team developers, there are at least a couple of ways to do it: You can either open a new Google Document and start…
Read More How To Document REST APIThis tutorial will teach you how to create a JPA Native SQL Query to only select information from specific columns. You can find many more Spring Data JPA-related tutorials on this site. Some of the most popular tutorials are: One-to-One Mapping Hibernate/JPA Using Spring Boot and MySQL One-to-Many Mapping Hibernate/JPA Using Spring Boot and MySQL…
Read More Select Specific Columns with JPA Native QueryIn this blog post, I am going to list commonly used POM.XML dependencies for building RESTful Web services with Spring Boot and Spring MVC. The list of below dependencies is not complete and will depend on the functionality you need your RESTful Web Services to support. But if you are building a simple REST API…
Read More Common POM.XML Dependencies for RESTful Web ServicesIn 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, you will learn how to retrieve the HTTP header value from an HTTP response while testing your RESTful API using REST Assured. What are HTTP Headers? HTTP headers are a fundamental part of the HTTP protocol, which is the protocol used to transfer data over the web. An HTTP header is a…
Read More Read HTTP Header with REST Assured