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You just have to Define the annotation and then define the interceptor by implementing HandlerInterceptor interface. The next is to add the interceptor to the path and then use the annotation on the specific controller. You can leverage the overridden methods like postHandle and preHandle() to implement your own logic. Please refer the Aegis blogs for detailed implementation part

Use spring boot transactional annotations on your DAO methods for transaction management. When exceptions are thrown, Spring will take care of starting transactions, committing transactions, and rolling back transactions. Instead of DAOs, you should utilise transactional annotations on your business services if you have them.. Ex: @Transactional(propagation=Propagation.REQUIRED)

public class AegisTestDao extends HibernateDaoSupport { }

The fact that we don't have to add swagger annotations like @ApiResponse or @ApiOperation to our Controller code because of Spring Rest docs' ability to generate REST API documentation. Also, the documentation is now stored alongside the code. By building a Spring Bean that returns an OpenAPI bean, you can add OpenAPI configuration and general API documentation to your microservice. Spring @Value annotations are used to initialize the api* variables that are needed to configure the OpenAPI bean from the property file. For additional information on the code, please see our Aegis blogs.

Here, you have to validate request body sent to PUT/POST REST APIs and also you can add custom error messages in API responses. To apply spring default validation, we only need to add relevant annotations like @NotEmpty in proper places and then you have to Enable validation of request body by @Valid annotation. The main thing you have to add is the class that extends ResponseEntityExceptionHandler and annotate it with @ControllerAdvice annotation.

Spring Cloud Gateway At startup , Load the routing configuration and rules into memory and If you restart the gateway, you can change the route and your dynamic routing service class should implement ApplicationEventPublisherAware interface and then autowire the RouteDefinitionWriter and ApplicationEventPublisher. In your service impl class, you have to implement add() and update() route methods. Please refer the Aegis Spring cloud gateway dynamic Routing blogs for more detail code implementation