You can find the demo of these applications at below link. Topic Link Spring Boot Core https://self-learning-java-tutorial.blogspot.com/2018/07/spring-boot-core-tutorial.html Actuator https://self-learning-java-tutorial.blogspot.com/2019/09/spring-boot-actuator-tutorial.html Aspects https://self-learning-java-tutorial.blogspot.com/2019/09/spring-boot-introduction-to-aspect.html Cache https://self-learning-java-tutorial.blogspot.com/2019/09/spring-cache-tutorial.html Data Rest https://self-learning-java-tutorial.blogspot.com/2019/12/spring-data-rest-tutorial.html Development Tools https://self-learning-java-tutorial.blogspot.com/2019/10/spring-boot-development-tools-tutorial.html GraphQL https://self-learning-java-tutorial.blogspot.com/2019/10/spring-boot-graphql-tutorial.html JDBC https://self-learning-java-tutorial.blogspot.com/2019/11/spring-boot-jdbc-tutorial.html MongoDB https://self-learning-java-tutorial.blogspot.com/2019/11/spring-data-mongodb-tutorial.html REST API Development https://self-learning-java-tutorial.blogspot.com/2019/08/introduction-to-spring-boot-rest.html RestTemplate https://self-learning-java-tutorial.blogspot.com/2019/09/spring-resttemplate-tutorial.html Security https://self-learning-java-tutorial.blogspot.com/2019/08/spring-boot-security-tutorial.html JPA https://self-learning-java-tutorial.blogspot.com/2019/08/introduction-to-spring-data-jpa.html Web Application Development https://self-learning-java-tutorial.blogspot.com/2019/08/spring-boot-web-application-development.html WebFlux https://self-learning-java-tutorial.blogspot.com/2019/12/spring-webflux-tutorial.html Testing spring boot applications https://self-learning-java-tutorial.blogspot.com/2019/10/testing-spring-boot-applications.html Miscellaneous Topics https://self-learning-java-tutorial.blogspot.com/2019/08/spring-miscellaneous.html