The application was made for itself and does not mean commercial use. The work is very simple - keep track of the validity of certificates. It is based on the MongoDB database, and the launch of modes is controlled by the JCommander framework. Maven Project Collector. This application consists of three parts:
Work with the database;
Notifications;
Working with the database includes adding, changing, deleting and viewing information. The "Notifications" mode is used to track the expiration dates of certificates. Data loading mode loads data into the database from a text file.