Overview Recently I had this use case: I need to integrate Android login with my web app which is using keycloak as IDP. Once the user logs in successfully, the Android app will send an ID token to verify to the backend. Since the user doesn’t have a password (because they haven’t registered for example), … Read more
Overview With all the setup done, let’s focus on making our app. The main purpose of the app is to let the user track their income and expenses. You’ve probably come through apps like this many times. We can spend the whole day listing all possible features an app like this can have. However, for … Read more
Overview In the previous post, we integrated Angular with Auth0 successfully. In this post, we continue to integrate Auth0 with Spring Boot. The Spring Boot API is the resource server that our users will interact with to manage their wallets. Also, as in the series introduction, we mentioned that the database we use would be … Read more
Overview One of the biggest questions I have when studying the functional interfaces in java.util.function is why the creators made DoubleConsumer (LongConsumer, IntConsumer) while there is already a Consumer interface that can handle any kind of object. It turned out, they have solid reason to do so. Boxing, unboxing, autoboxing primer As you may already … Read more
Overview In Java functional programming, Consumers are incredibly versatile and valuable, particularly when it comes to performing actions on data without returning values. Why use Consumers? Here are the main reasons using Consumers is beneficial to your code: Simplifying Side Effects You may hear or read somewhere that in functional programming, side effects should be … Read more
Overview The predicate interfaces in the java.util.function package return a boolean given one or some arguments. The primary purpose of the Predicate interface is to simplify the task of evaluating conditions or tests within your Java applications. It abstracts the process of writing conditional statements and allows you to represent complex conditions as reusable, composable … Read more