Overview With NIO2, you can do things that aren’t available in the old IO. One of such things is you can watch file changes in certain directories. Let’s see how to do it in action. Watching file changes in directories using Java Let’s consider this code snippet: This code is quite straightforward. Essentially, it creates … Read more
Overview If you don’t have much time, this table captures the core of the SOLID principles: Principle Description Single Responsibility Principle (SRP) Clients should not be forced to depend on interfaces they do not use. This principle promotes the idea of small, focused interfaces instead of large, monolithic interfaces. Clients should only be exposed to … Read more
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