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Accessing keycloak endpoints in a spring boot cloud service

In an existing system, that is a spring boot cloud gateway I'm trying to switch out the code that generates the jwt tokens and manages users for Keycloak.
I found the rest endpoints via this link https://www.baeldung.com/postman-keycloak-endpoints. And that all works fine.
The problem is I can't find for the life of mine if Keycloak has a client for that in their managed code? Or do I need to write a custom client for this?
I can't really use the spring boot adapter because of the complexity of the already existing system.
Kind Regards,

Create traceID in a non-Spring application

Small question on how to create traceID, but when the app is not Spring-based please.
My application is the first, the initiator of a HTTP call. Therefore, the app can be considered as client.
The destinations, the servers, are all Spring Boot Spring Cloud based web applications. I would like to emphasize, while the servers are Spring-based, me, the client, I am not a Spring Boot app.
While my app, being a non-Spring app, I do use the Spring Webflux WebClient in order to create the HTTP requests to those servers. To emphasize, it is not because I use the Spring Webflux WebClient, that makes the app a Spring app!
Since I am the first of the call chain, I would like to create some kind of traceID, so the subsequent services will carry the traceID I created.
I am puzzled as what should come inside this piece of code that I tried:
final var response = webClient.post().uri("http://some-third-party-api.com/someroute").header("X-B3-TraceId", "How to create a traceID?").body(BodyInserters.fromValue(payload)).retrieve().bodyToMono(String.class).block();
Therefore, I would like to ask, being the first, the HTTP call initiator, using a Spring Webflux WebClient, but in a non-Spring app, how to create those traceID so the subsequent services get the one that I created?

By default Sleuth is using OpenZipkin's tracing library called Brave. If your application is java-based, you can use Brave, if not, you can find official implementations for other platforms in the
OpenZipkin org or official and non-official ones in https://zipkin.io/pages/tracers_instrumentation.html

Security issue in microservices with Spring Boot

I have misunderstanding security in microservices in spring boot (and general). I want to build a project using Spring framework and microservices but in architecture planning I stuck. How should be security in microservices at all? In my opinion that in all project should be one component which all request go throw the component and spread to other components. What I could find it's Spring Cloud Zuul which is api gateway in microservices and I got idea to make a project which is response for gateway and add security in the component as well. I mean it will be something like a project that contains Spring Cloud Zuul, Spring Security, Spring Data JPA dependencies. How do you think is it good way to provide a security or not? Is it possible to build something like that?

In the project I was involved, we used security at a couple of different levels:
Security at individual route level in Zuul.
Security at each internal service
Here is the flowchart for the security model used in our Spring Cloud project,
When Zuul receives a request, it checks if a route exists for the request.
If a route exists, checks if the route is secured based on custom configuration.
If the route is secured, authenticates the request.
Once the request is authenticated at Zuul, Zuul again checks if the internal service, to which request is to be routed, is secured based on configuration.
If the internal service is secured, creates a new Authentication header based on the user credentials (stored in the custom configuration) before routing the service to the internal service.
Once the internal service receives the request from Zuul, it checks if the request needs to be authenticated.
Once authenticated, processes the request and sends the response back.

I think the answer here might help you, they are talking about using firewall to limit the access from the outbound IP and only allow zuul gateway to access all microservice.
Don't allow direct calls to Microservices. Only allow through API Gateway

I think you can consider using OAuth.
It uses JWT(Jason web token), which is a token passed along with all request/response.
you can find detailed information here: https://nordicapis.com/api-security-oauth-openid-connect-depth/

Spring Boot Multi tenancy with oauth

I have a working standard Spring Boot/Hibernate multi tenancy (schema) solution but failing to intercept the oauth token request on /oauth/token.
It seems that HandlerInterceptor instances are getting called for any request but not those pointing to my token endpoint. Which is a problem as I require multi tenancy there.
So I need some class that gets called at the start of any request to extract the tenant information from the request which will then be stored in some ThreadLocal. And also I need a method called after the request processing to remove the tenant information from the ThreadLocal to be safe.
I guess a WebFilter is not sufficient as it will get called only once per request. And any MVC handler/interceptor is not getting called for my oauth endpoints which are configured by spring boot auto configuration and seem to bypass the mvc invocation.
Can the oauth resource get intercepted by mvc handlers?
Is there any other solution to my problem than using RequestContextHolder?
Any ideas hints - thanks in advance!
Gerrit

Working with REST API Calls while Using Spring Security Core PlugIn

I am currently working on Grails Application where I have REST API using jaxr PlugIn. The scenario is that there is a Third Party who says that give us a URL and we will send you the notifications on that URL.So I created a REST API with post method. So I can send data using this post method. So,I gave this URL to that third party which now sends me notifications over that URL. And in the body of that POST method in my REST API gets the notification and do what I want to.
So, I used Spring Security Core to authenticate my other features of application. And I wasn't intended to secure this REST API that I implemented using Jaxr PlugIn. But after using that Spring Security Core plugin my Rest API stopped working as it has restricted this REST API too. I tested it on my machine too and send post requests but this plugin is not allowing me to make request due to authentication issue.
Please guide me that what I should do in this scenario? I don't want to secure my REST, can I proceed with this?
Thanks for your precious time :)

With Spring security you define urls that are secured. Specify correct url patterns and it should be ok.