Elasticsearch, from its name, can you also guess that it is related to search? It is a search engine built from Apache Lucene that helps us to search quickly using RESTful Web Service. It was developed using Java language and is a distributed system, easily… Read More
I showed you how to build an API Gateway using Zuul Proxy of Spring Cloud Netflix. In this tutorial, I introduce to you another way, using another library in the Spring framework ecosystem, that is, Spring Cloud Gateway! To put it simply, in principle, an… Read More
I showed you how to install the PostgreSQL server. Once the PostgreSQL server is installed, you can also work with it using the command line with the psql tool. But here we have a tool that makes us easier to work with PostgreSQL, with an… Read More
The WebSecurityConfigurerAdapter class has been deprecated since version 5.7.0 of Spring Security and has been removed since version 6.x, so if you are using the latest version of Spring Security to configure your project, please read the tutorial Configure Spring Security to use SecurityFilterChain and Spring… Read More
When creating a Spring MVC project using the Spring Tool Suite 3 IDE, you can see, we have a web.xml file that defines the configuration for the DispatcherServlet, the root-context.xml and the servlet-context.xml files define bean configuration in Spring container including ViewResolver, a Controller handle… Read More
When working with applications that use Spring Boot, you will need to write Unit Test for your code. In this tutorial, I will show you how to write Unit Test for the Spring Boot application! First, I will create a simple Spring Boot application for… Read More
When using Keycloak for the authentication of web applications, we will often encounter Web Origin-related errors such as “Access to XMLHttpRequest at ‘http://localhost:8080/realms/huongdanjava/protocol/openid-connect/token’ from origin ‘http://localhost:4200’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.” The reason is that… Read More
OAuth 2.0 Security Best Current Practice recommends that we do not use grant type Resource Owner Password Credentials of OAuth2 but if your application needs to use this grant type, please read this tutorial! I will guide you on how to create and configure the… Read More
Project Reactor with Mono and Flux objects may make it difficult for you to think about how to write Unit Test for reactive code. Actually, this will be solved easily if you use the StepVerifier class of the reactor-test library. How is it in details?… Read More
When you develop an application with different Maven projects, we will often use a Maven parent project to manage these Maven projects. It will help us to centralize the version management of the dependencies used for the application, when we want to upgrade the version… Read More
