This article guides you through building a Spring Boot demo application and deploying it on Kubernetes using the JBoss Web Server Operator. The application uses the TodoMVC Angular front-end, integrated with a Spring Boot backend. The Todo entity is defined with JPA annotations for database mapping. The TodoController handles CRUD operations, and TodoRepository extends JpaRepository for database interactions. The application can be run locally or packaged with Tomcat as an embedded server. The deployment process includes building a Docker image, pushing it to a repository, and deploying on OpenShift. Configuration details for both H2 and PostgreSQL databases are provided.