CREATE USER tenant1 IDENTIFIED BY 123456;
GRANT CONNECT,RESOURCE,DBA TO tenant1;
GRANT UNLIMITED TABLESPACE TO tenant1;

CREATE USER tenant2 IDENTIFIED BY 123456;
GRANT CONNECT,RESOURCE,DBA TO tenant2;
GRANT UNLIMITED TABLESPACE TO tenant2;

https://projectlombok.org/
https://projectlombok.org/features/Data
https://projectlombok.org/features/GetterSetter
https://www.projectlombok.org/features/Builder
https://projectlombok.org/features/constructor

@Configuration
É uma annotation que indica que determinada classe possui métodos que expõe novos beans.

@Controller
Associada com classes que possuem métodos que processam requests numa aplicação web.

@Repository
Anotação que serve para definir uma classe como pertencente à camada de persistência.

@Service
Anotação que serve para definir uma classe como pertencente à camada de Serviço da aplicação.

@Autowired
A anotação @ Autowired fornece controle sobre onde e como a ligação entre os beans deve ser realizada. Pode ser usado para em métodos setter, no construtor, em uma propriedade ou métodos com nomes arbitrários e / ou vários argumentos.

You can use the Interceptor in Spring Boot to perform operations under the following situations −

Before sending the request to the controller
Before sending the response to the client

The following are the three methods you should know about while working on Interceptors −

preHandle() method − This is used to perform operations before sending the request to the controller. This method should return true to return the response to the client.

postHandle() method − This is used to perform operations before sending the response to the client.

afterCompletion() method − This is used to perform operations after completing the request and response.

https://www.tutorialspoint.com/spring_boot/spring_boot_interceptor.htm

https://www.baeldung.com/java-threadlocal

https://fizzylogic.nl/2016/01/24/make-your-spring-boot-application-multi-tenant-aware-in-2-steps/
https://github.com/wmeints/spring-multi-tenant-demo
https://www.baeldung.com/spring-abstract-routing-data-source
https://github.com/Cepr0/sb-multitenant-db-demo