ng-starter | Angularjs Boilerplate Starter Kit

There's a spring-boot standard way. In the starter you can autowire the ApplicationEventPublisher

In a microservice architecture that I have worked, we have always used the OAUTH2 specification for securing service.

OAuth2 is a token-based security framework that allows a user to authenticate themselves with a third-party authentication server. If the user successfully authenticates, they will be presented with a token that must be sent with every request. The token can then be validated back to the OAuth2 Server. The OAuth2 Server is the intermediary between the application and the services being consumed. The OAuth2 Server allows the user to authenticate themselves without having to pass their user credentials down to every service the application is going to call on behalf of the user.

Detail information for OAuth2 you can find in the following LINK .

I have implemented simple microservice architecture for demonstrating how services are connected with each other.

Here is the link LINK

Below is the image representing the architecture:

It just boils down to create a GraphQLHttpServlet and configure its context path. Under the cover , it uses auto-configuration GraphQLWebAutoConfiguration to define a GraphQLHttpServlet as a bean, and configure the context path to be /graphql.

That means you can reference how GraphQLWebAutoConfiguration does and create another GraphQLHttpServlet instance that registered to other context path.

The main point is that to register a Servlet in spring boot , you can simply create a ServletRegistrationBean that wraps the HttpServlet which you want to create .See docs for more details.

A simple example is :

As described in Auto-configured Data JPA Tests

You can use the @DataJpaTest annotation to test JPA applications. By default, it scans for @Entity classes and configures Spring Data JPA repositories. If an embedded database is available on the classpath, it configures one as well. Regular @Component beans are not loaded into the ApplicationContext.

Your repository in NOT a Spring Data repository, and hence is not loaded to the context

IMHO using a Spring Data repo (with custom methods if needed) is the way to go in your case.

See also: Unable to test custom repositories using Spring Boot Test #8501

You should enable CORS on your backend. Angular app is served at http://localhost:4200 and browser refuses to make request to another domain (in this case http://localhost:8080).
More information on CORS.

So, you should whitelist your front-end url on your backend app.

You can easily do that with Spring Boot by adding some lines in your Application class :

api.service.ts

Assuming that the bottleneck is not the API call, you can use multiprocessing.Pool() for this.

I found out that @IfProfileValue only support for junit4, in junit5 we will use @EnabledIf and @DisabledIf.

Reference https://docs.spring.io/spring/docs/current/spring-framework-reference/testing.html#integration-testing-annotations-meta

Update: Thanks to @SamBrannen'scomment, so I use junit5 build-in support with regex matches and make it as an Annotation.

I fixed the issue by changing the bean to use RedisProperties. Here is the code that ended up working.