JPA has its own query language and supports native SQL. You can create queries in a very similar way as JPQL queries and they can even return managed entities.
Spring Cloud Gateway can help implement the gateway pattern for your API, especially in a microservices environment. Learn how to make use of it by way of an example.
You're probably no stranger to managing multiple JavaScript frameworks, so let's see how to use Vue and Node together to create a user management system.
Eclipse Vert.x is a toolkit that let you write reactive applications. In Part 1 of this tutorial series, we'll learn how to make your first Vert.x application.