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
In the introduction to Spring Security, we used a configuration file and declared it with the DelegatingFilterProxy filter class to enable Spring Security for any web application. We can also do this using Java code with the WebSecurityConfigurerAdapter and AbstractSecurityWebApplicationInitializer classes, powered by Spring Security.… 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/auth/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
When working with applications that use Keycloak for authentication, which the front-end calls to the back-end using APIs, we will often need to test APIs with access tokens, because this time the back-end will also need to use Keycloak for authentication. To do this, we… 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
PostgreSQL is an open-source object-relational database system. We have different ways to install PostgreSQL server on many different environments, as well on macOS. In this tutorial, I will show you a way to install PostgreSQL server on macOS using Postgres.app! First, you need to go… Read More
To use applications that use Keycloak for authentication and authorization, we need a user to log in. Usually, in large systems, the user information will be stored in Active Directory (AD) or LDAP, Keycloak can connect to these systems to retrieve user information. It can… Read More
