Spring Boot is a bounded framework. The services we develop are purely synchronous services, so there's a blocking and waiting state. This is a big problem in microservices. To avoid this problem, we have to make the service a reactive session. It has to be reactive to a particular load, particular condition, or based on the number of requests hitting the particular service. All these factors make the service a reactor. There's another module in which Spring Boot provides spring reflex. This module enables the reactiveness of the service, meaning that it eliminates the blocking and waiting state. For example, if you're sending a get operation or a post operation, there won't be any waiting for it to actually hit that particular network to get the data from another service. It continuously flows the request, and there is a zero waiting pack. Vert.x is another good framework where there are similar features or similar benefits with having a reactive session. Spring Boot is a license resource, so it's a framework where we can customize our solution or a particular requirement to build a good solution using Spring Boot. But it's an opinionated framework, meaning that it's completely bounded. You have only one direction to find a solution, whereas Vert.x is an unopinionated framework. Unopinionated is a kind of a toolkit where you can have more optimization and a more flexible solution, which is suitable to your requirements. In Spring Boot, the opportunities are limited. With Vert.x and other programming tools, we have multiple options to explore the solution in a different way and achieve a nonfunctional requirement of thousands transactions in a second. Spring Boot might not support this kind of non-functional requirement. Vert.X is a very good solution to solve critical NFRs for a particular application.
