This example application shows how to create a web UI for PostgreSQL databases.
git clone https://github.com/alejandro-du/mybatis-spring-vaadin.git
Edit the .../resources/application.properties
file to configure the connection to your PostgreSQL database.
cd mybatis-spring-vaadin
mvn install
cd target
java -jar mybatis-spring-vaadin-0.0.1-SNAPSHOT.jar
Read the full guide at https://vaadin.com/blog/-/blogs/building-a-web-ui-for-postgresql-databases