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<project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.1.RELEASE</version>
        <relativePath />
        <!-- lookup parent from repository -->
    </parent>
    <groupId>in.neuw</groupId>

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@Bean
fun springSecurityFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain? {

    val httpClient = HttpClient.create()
            .tcpConfiguration{client -> client.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000)}
            .secure { sslContextSpec: SslProvider.SslContextSpec -> sslContextSpec.sslContext(sslContextBuilder(keyStoreContent, keyStorePassword, trustStoreContent, trustStorePassword)) }
    val httpConnector: ClientHttpConnector = ReactorClientHttpConnector(httpClient)

    val builder = NimbusReactiveJwtDecoder
            .withJwkSetUri("https://<host>/.well-known/jwks.json")

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// pass the base 64 encoded String of the Keystore and keystore password
KeyManagerFactory keyManagerFactory = SSLContextHelper.getKeyStore(encodedKeystoreString, keystorePassword);
// pass the base 64 encoded String of the Truststore and truststore password
TrustManagerFactory trustManagerFactory = SSLContextHelper.getTrustStore(encodedTruststoreString, truststorePassword);
// Construct the SslContext using keyManagerFactory & trustManagerFactory
SslContext sslContext = SSLContextHelper.sslContext(keyManagerFactory, trustManagerFactory);

HttpClient resourceServerHttpClient = HttpClient.create()
      .tcpConfiguration(client -> client.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 10000))
      .secure(sslContextSpec -> {

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server.port=8533

spring.security.oauth2.client.registration.local.authorization-grant-type=client_credentials
spring.security.oauth2.client.registration.local.client-id=client_id
spring.security.oauth2.client.registration.local.client-secret=client_secret

oauth2.client.provider.local.token-uri.base-path=https://localhost:8353
spring.security.oauth2.client.provider.local.token-uri=${oauth2.client.provider.local.token-uri.base-path}/oauth/token

oauth2.client.registration.local.ssl-enabled=true

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\--oauth2-spring-boot-client - Root
|   .gitignore - Git management for ignoring not required files
|   pom.xml - Maven pom.xml
+---src
|   +---main
|   |   +---java
|   |   |   \---in
|   |   |       \---neuw
|   |   |           \---oauth2
|   |   |               |   Oauth2SpringBootClientApplication.java - The SpringBootApplication main class.

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spring.security.oauth2.client.registration.<identifier>.authorization-grant-type=client_credentials
spring.security.oauth2.client.registration.<identifier>.client-id=client_id
spring.security.oauth2.client.registration.<identifier>.client-secret=client_secret

spring.security.oauth2.client.provider.<identifier>.token-uri=http://localhost:8353/oauth/token

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@Configuration
public class TestClientConfig {

    @Value("${test.client.base.url}")
    private String testClientBaseUrl;

    private Logger testWebClientLogger = LoggerFactory.getLogger("TEST_WEB_CLIENT");

    /**
     * The authorizedClientManager for required by the webClient

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\--oauth2-spring-boot-client - Root
|   .gitignore - Git management for ignoring not required files
|   pom.xml - Maven pom.xml      
+---src
|   +---main
|   |   +---java
|   |   |   \---in
|   |   |       \---neuw
|   |   |           \---oauth2
|   |   |               |   Oauth2SpringBootClientApplication.java - The SpringBootApplication main class.

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public class JKStoBase64String {
    private static final int BUFFER_SIZE = 65535;

    public static byte[] convertFileToByteArray(String certificateFilePath) throws Exception {
        if (certificateFilePath == null || certificateFilePath.isEmpty()) {
            throw new Exception("file path should not be null or empty");
        }
        File file = new File(certificateFilePath);
        if (!file.exists()) {
            throw new Exception("file not exist : " + file.getAbsolutePath());

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<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-oauth2-jose</artifactId>
</dependency>