Using `@ConfigurationProperties` annotation on `@Bean` Method

Question

Could someone give a MWE of how to use the @ConfigurationProperties annotation directly on a @Bean method?

I have seen countless examples o

Answer 1

I found following solution: i.e. we have in application yaml couple of section and we are interesting in appConfig:

  appConfig:
  version: 1.0_alpha
  environment: ${spring.profiles}
  dbDriver: ${spring.datasource.driver-class-name}
  dbUrl: ${spring.datasource.url}
  keyCloak:
      serverOne:
          host: http://xx.xx.xxx.xxx:8080
          baseUrl: ${appConfig.keyCloak.serverOne.host}/auth/realms/master
          clientId: api-service-agent
          clientSecret: f00955443-d123-4cfe-90d3-e3ff3b214aaffe
          serviceUsername: service-user
          servicePassword: 1234567890
      serverTwo:
          host: http://xx.xxx.xxx.xxx:8080
          baseUrl: ${appConfig.keyCloak.serverTwo.host}/auth/realms/wissance
          clientId: api-service-agent
          clientSecret: a20ddf0-56fa-4991-85bc-114377eeffddcc
          serviceUsername: service-user
          servicePassword: 1234567890
      using: 
          baseUrl: ${appConfig.keyCloak.serverTwo.baseUrl}
          clientId: ${appConfig.keyCloak.serverTwo.clientId}
          clientSecret: ${appConfig.keyCloak.serverTwo.clientSecret}
          serviceUsername: ${appConfig.keyCloak.serverTwo.serviceUsername}
          servicePassword: ${appConfig.keyCloak.serverTwo.servicePassword}

We would like to split common settings and using KeyCloak settings, so i implemented following scheme:

I make following KeyCloakConfig class (without @ConfigurationProperties annotation) to store using authentication server settings:

@Configuration
public class KeyCloakConfig {

    public KeyCloakConfig(){

    }

    public KeyCloakConfig(String baseUrl, String clientId, String clientSecret, String username, String password) {
        this.baseUrl = baseUrl;
        this.clientId = clientId;
        this.clientSecret = clientSecret;
        this.username = username;
        this.password = password;
    }

    public String getBaseUrl(){
        return baseUrl;
    }

    public void setBaseUrl(String baseUrl){
        this.baseUrl = baseUrl;
    }

    public String getClientId(){
        return clientId;
    }

    public void setClientId(String clientId){
        this.clientId = clientId;
    }

    public String getClientSecret(){
        return clientSecret;
    }

    public void setClientSecret(String clientSecret){
        this.clientSecret = clientSecret;
    }

    public String getUsername(){
        return username;
    }

    public void setUsername(String username){
        this.username = username;
    }

    public String getPassword(){
        return password;
    }

    public void setPassword(String password){
        this.password = password;
    }

    @Value("${appConfig.keyCloak.using.baseUrl}")
    private String baseUrl;

    @Value("${appConfig.keyCloak.using.clientId}")
    private String clientId;

    @Value("${appConfig.keyCloak.using.clientSecret}")
    private String clientSecret;

    @Value("${appConfig.keyCloak.using.serviceUsername}")
    private String username;

    @Value("${appConfig.keyCloak.using.servicePassword}")
    private String password;
}

and AppConfig class that holds common settings like version, environment using DB driver & url and also KeyCloakConfig as property:

@Configuration
@EnableConfigurationProperties
@ConfigurationProperties
public class AppConfig {

public AppConfig(){

    }

    public AppConfig(String apiVersion, String environment, String databaseDriver, String databaseUrl){
        this.apiVersion = apiVersion;
        this.environment = environment;
        this.databaseDriver = databaseDriver;
        this.databaseUrl = databaseUrl;
    }

    public String getEnvironment(){
        return environment;
    }

    public void setEnvironment(String environment) {
        this.environment = environment;
    }

    public String getDatabaseDriver(){
        return databaseDriver;
    }

    public void setDatabaseDriver(String databaseDriver) {
        this.databaseDriver = databaseDriver;
    }

    public String getDatabaseUrl(){
        return databaseUrl;
    }

    public void setDatabaseUrl(String databaseUrl) {
        this.databaseUrl = databaseUrl;
    }

    public String getApiVersion(){
        return apiVersion;
    }

    public void setApiVersion(String apiVersion) {
        this.apiVersion = apiVersion;
    }

    public KeyCloakConfig getKeyCloakConfig(){
        return keyCloakConfig;
    }

    public void setKeyCloakConfig(KeyCloakConfig keyCloakConfig){
        this.keyCloakConfig = keyCloakConfig;
    }

    @Value("${appConfig.version}")
    private String apiVersion;

    @Value("${appConfig.environment}")
    private String environment;

    @Value("${appConfig.dbDriver}")
    private String databaseDriver;

    @Value("${appConfig.dbUrl}")
    private String databaseUrl;

    @Autowired
    private KeyCloakConfig keyCloakConfig;
}