In all these projects I work with postgreSQL (just for example, it is not a restriction of the only one RDBMS i can use)
Simple forum (Spring Boot, Spring Data, Hibernate, Spring Security)
https://github.com/ForLearningAtJob4J/job4j_forum
Simple car accidents log (Spring MVC, Spring Data, Hibernate, Spring Security)
https://github.com/ForLearningAtJob4J/job4j_car_accident
Here are:
Small SPA project for GTD, front + RESTful back with auth + hibernate.
https://github.com/ForLearningAtJob4J/job4j_todo
Another project - web application with auth.
https://github.com/ForLearningAtJob4J/job4j_dreamjob
CLI grabber utility with http web server. It gets vacancies from sql.ru
https://github.com/ForLearningAtJob4J/job4j_grabber
CLI todo-like app. Hmm, it is here to show that I know about unit- and integrational-testing. (Actually you'd better not look at it - it is not a good project, but just a mess of some technologies ) Ok, i warned you )