constructor injection instead of field injection

src/main/resources/application.properties

@@ -1,7 +1,7 @@
 spring.application.name=ArtisanConnectBackend
 
 ## PostgreSQL
-spring.datasource.url=jdbc:postgresql://192.168.56.103:5432/default_db
+spring.datasource.url=jdbc:postgresql://localhost:5432/postgres
 spring.datasource.username=postgres
 spring.datasource.password=postgres