1. Establish connection to my DB
  - using community version of Idea - download plugin DB Browser
    (танці з бубном трохи) - it is work;
  - create new schema - books;
2. Create init_db.sql file and put the script.
3. Create Book model
4. Create DAO layer for Book model.
   - create();
   - findAll();
   - findById();
   - update();
   - deleteById();
5. Used Dao annotation;
6. Return Optional findById;
7. Call CRUD methods in main.
8. Using custom exception

corrected

Create costom exeption DataProcessingException and using it
Create Conction util and using it

fixed the mistakes
corrected