spring-hateoas | Spring Hateoas sample project | Application Framework library

I followed the Spring on Building REST tutorial using HATEOAS at: https://spring.io/guides/tutorials/rest/ and mixed it with JPA and MySQL DB (Maven). When I run the app, I can see the initial 2 tables in MySQL workbench fine (although there is a 3rd one appearing out of nowhere?). If i perform a GET /players, it works fine. When I do a POST Request (http://localhost:8080/players) in Postman with body as JSON: { "playerName":"Pedro" }, I get a 500 status and I get an error from Spring

Not enough variable values available to expand 'id'] with root cause...

I would like to achieve full CRUD operations. A lot of doubts arises here, given that playerId is autoincrement, and the parameter registrariondate is a TIMESTAMP. This is secondary, as I guess the problem comes from making use RepresentationModelAssembler in my app, but not quite sure how to handle the responses and the petitions.

Here the project structure:

Log of the error:

Spring documentation tells me here: https://docs.spring.io/spring-hateoas/docs/1.2.2/reference/html/#migrate-to-1.0.changes.representation-models that I should use CollectionModel instead of Resources class. But when I do, my IDE tells me that CollectionModel is deprecated. Like here:

What should I do now or use now to achieve HATEOAS in Spring boot?

I can't make a request via postman, I checked everything, my email is represented as varchar(255) in my database. I use postgresql. Error: Required String parameter 'email' is not present. I used response and set it like this: @RequestParam(value = "params", required = false) String params for each received value, but this didn't help, as the program reported that we didn't send anything. What does this have to do with? The request is correct, as well as the accepted parameters are correct.

What the request looks like:

I'm accessing a HATEOAS API provided by a 3rd party and for some reason the response we receive from them contains links with null values for href. This throws an exception. I can not change the response as I have no control over this API. Is there any way around this problem?

Below is an example of what the JSON looks like:

GOAL: I'm just trying to invoke a get call on REST endpoint of a Spring HATEOAS application. This is a simple project with MongoDB as the database.

Expected Result: When I try to invoke Get endpoint from the REST controller class, appropriate response should be return.

Actual Result: cannot invoke Get endpoint, giving me an internal server error when invoking using the postman.

below is the REST endpoint I'm trying to invoke

I want to add spring-hateoas to my portfolio project and make it fully restful. That means that I need to override methods given by AbstractResource class(this is base class for my @RestController's) to edit it for my needs and when I do so I get org.springframework.dao.InvalidDataAccessApiUsageException: The given id must not be null!

My project look as follows:

• service package

I've been upgrading a Spring application from 1.5.4 to 2.3.1. Subsequently, Flyway was bumped up from 4.1.2 to 6.4.4. The problem I'm facing now, is that when some Flywaytests run, the following Exception is thrown:

I have my ExceptionHandler in spring project. I want to use @ControllerAdvice in my project, but i have some trouble with it. When i build project, i have errors,but if i comment @ControllerAdvice, my project build fine.For build I use gradle. Below i add code of errors, MyExceptionHandler and build.gradle.

I have included hateoas dependency in my spring boot project but I am unable to run the project because of few exceptions that are being shown. I have tried cleaning the workspace, mvn clean install and also restarting the application but it's not working. Is there something I am missing here?

pom.xml