Spring Cloud Docker Keycloak Connection Refused after Request

General
1

I have a problem about sending a request and get user information from Keycloak running in Docker in Spring Cloud Example.

Here is my Keycloak example defined in user service.

@Configuration
public class KeycloakConfig {

    public final static String serverUrl = "http://keycloak:8181";
    public final static String realm = "master";
    public final static String clientId = "spring-boot-microservice-keycloak";
    public final static String clientSecret = "l4ToCS7CfEA3uR3BH4M9YzhxXNrzymOh";
    final static String userName = "admin";
    final static String password = "admin";

    @Bean
    public KeycloakConfigResolver keycloakConfigResolver(){
        return new KeycloakSpringBootConfigResolver();
    }

    @Bean
    public Keycloak keycloak(){
          return Keycloak.getInstance(serverUrl,
                realm,
                userName,
                password,
                clientId,
                clientSecret);
    }
}

Here is my user service properties file shown below.

#spring.datasource.url=jdbc:mysql://localhost:3306/springbootuser?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=Turkey
spring.datasource.url=jdbc:mysql://database:3306/springbootuser?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=Turkey
spring.datasource.username=springmicroserviceuser
spring.datasource.password=111111

# Define hibernate settings (JPA / Hibernate properties)
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect

server.port=9000

spring.application.name=user-service
#eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka
eureka.client.serviceUrl.defaultZone=http://eurekaserver:8761/eureka

keycloak.realm=master
#keycloak.auth-server-url=http://localhost:8181
keycloak.auth-server-url=http://keycloak:8181
keycloak.ssl-required=external
keycloak.resource=spring-boot-microservice-keycloak
keycloak.bearer-only=true
keycloak.public-client=true

When I send a request http://localhost:8600/api/v1/users/signup to user service, I had a problem in Keycloak.

Here are errors shown in the console from user service.

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw excepti
on [Request processing failed; nested exception is javax.ws.rs.ProcessingException: RESTEASY004655: Unable to invoke request: org.apache.http.conn.HttpHostConnectException: Connect to
keycloak:8181 [keycloak/172.19.0.3] failed: Connection refused (Connection refused)] with root cause

How can I fix it?

Here is the project link : Link