Spring Security Authorization Server (experimental) - Sample projects, from Gradle to Maven (Dependencies) - spring-boot

Question

As recommended here I now want to try the sample projects given in the experimental Authorization Server project.
I use Maven, don't know much about Gradle. I assume, that the samples folder is independent of any other artifact in the Authorization Server project?
I created via start.spring.io the 3 projects, added the missing dependencies manually, and the pom.xml look like this:
authorizationserver
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>authorizationserver</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>authorizationserver</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>15</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security.experimental</groupId>
<artifactId>spring-security-oauth2-authorization-server</artifactId>
<version>0.1.2</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
resourceserver
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>resourceserver</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>resourceserver</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>15</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
client
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>client</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>15</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-oauth2-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-springsecurity5</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webflux</artifactId>
<version>5.3.9</version>
</dependency>
<dependency>
<groupId>io.projectreactor.netty</groupId>
<artifactId>reactor-netty</artifactId>
<version>1.0.10</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>webjars-locator-core</artifactId>
<version>0.47</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>5.1.0</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.6.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Are these pom.xml correct? Is anything missing, are the versions OK to use, etc.?
I want to change my webservice (Spring Boot, REST controllers) from Basic Auth to OAuth2. My webservice is build with Spring Boot 2.5.3 and OpenJDK 15 (might change to 16) and Maven. That's why I use the latest versions in the pom.xml. But sample projects don't specify versions or use older version, that's why I don't know what versions are OK to use.
Is auth-server necessary or can it be replaced with 127.0.0.1?
AS
return new ProviderSettings().issuer("http://auth-server:9000")
->
return new ProviderSettings().issuer("http://127.0.0.1:9000")
RS
issuer-uri: http://auth-server:9000
->
issuer-uri: http://127.0.0.1:9000
Client
issuer-uri: http://auth-server:9000
->
issuer-uri: http://127.0.0.1:9000
Also, at https://github.com/spring-projects-experimental/spring-authorization-server/tree/main/samples/boot/oauth2-integration there are 4 projects.
The README says
Run Authorization Server
Run Resource Server
Run Client
what for is the project authorizationserver-custom-consent-page ?
I'm asking about the versions I use, latest in fact, because for example I need OpenJDK 15 as I'm using """ all over the place in my webservice project (which will be the Resource Server in context of OAuth2). I cannot therefore switch to versions like Java 8 or so, as stated here:
Prerequisites
Git and the JDK8 build.
Be sure that your JAVA_HOME environment variable points to the jdk1.8.0 folder extracted from the JDK download.
I'm not sure if my problems are related to newer versions of dependencies I use.
Meanwhile, with Maven all 3 projects compile and start, but I'm stuck at the login page. After giving the username and password, it remains on the login page. It seems to accept the user credentials, but loads the login page again. If I misspell the username or password, it complains bad credentials. This is with samples from the downloaded sources of 0.1.2.
It is not stated why auth-server has to be used, and therefore I did the replacements described earlier.
What value will be replaced for registrationId in redirect-uri: "http://127.0.0.1:8080/login/oauth2/code/{registrationId}" ?