Overview In this article, I will delve into the concepts of candidate keys, primary keys, natural keys, and surrogate keys in the context of Hibernate. Candidate Keys A candidate key is a column or a set of columns in a database table that can uniquely identify each row in the table. It means that candidate … Read more
Overview In this post, we are going to explore the reasons why does Hibernate need a no-arg constructor. The no-arg constructor need to be protected or public. A primer on the no-arg constructor When you declare a class without any constructor, the compiler create a default no-arg constructor for you. However, when you define constructor(s) … Read more
Overview Recently I worked on a web app that needed to call an external API. The web app comprises an Angular (16) client and a Spring Boot (3) server. The call to that external API can be slow (up to 30 seconds). Cases like this are ideal for using multithreading. In this post, I will … Read more
Overview When you start using multiple threads in Spring applications, many funny things happen. At least this was my experience. My use case is I have one endpoint that takes an audio file. The file would go through two services: As I want to return the result of the speech-to-text service immediately, the upload part … Read more
Overview If you see this error when trying to connect to a VPN server using OpenVPN Error message: option_error: sorry, unsupported options present in configuration: Removed deprecated options There is a simple fix. Here is how How to fix Connection failed due to unsupported options in OpenVPN Honestly, the error message is vague at best. … Read more
Overview Recently, for the first time, I encounter a need to use an interface in @RequestBody in my Spring Boot app. Here is the diagram: This is the request that contains one IAudioContent However, when I sent a request to create a question group with TTSSingleRequest in JSON format for example, I got the following … Read more