I have a controller with an endpoint that puts some objects in the ModelMap. I wrote a test for it and want to check, what was actually stored in the ModelMap.

I want to test the performance of my backend API application written with Spring Boot under high requests. How can I perform this process? Which tools should I use and what should I do step by step? What are the best practices for performance tests and how should I analyse the results?

I am creating springboot application. Have three different environment. dev, pre-prod, prod. I need to create application.properties file for each environment.
I can create files like below.

I have a new task about Converting pdf file to Excel file using Spring Boot framework.
If any one suggest me the maven dependency and Code, It will be much help for me.

I am learning Spring Boot and while making a web app, I encountered WhiteLabel error page with status code 404. Below is my controller code

For example a have this controller class

I know this question has been asked countless times, and some instances are indeed popular, however, I still haven’t found an answer that encompasses all of the requirements that I have, which in my opinion are very common.