Failed to configure a DataSource from command line

I'm trying to change Datasource setting from command Line. I have a application.properties with default setting. I would like to modify the parameters in the file from command Line, but when I pass Datasource arguments , I receive an error. I read on Externalized Configuration document :"Accessing Command Line Properties By default, SpringApplication converts any command line option arguments (that is, arguments starting with --, such as --server.port=9000) to a property and adds them to the Spring Environment. As mentioned previously, command line properties always take precedence over other property sources". I supposed that arguments overwrite the default setting into application.properties, but I'm missng some steps about that.

I've tried without spring.datasource.url or Placeholders in Properties. Below application.properties.

spring.datasource.url =  jdbc:oracle:thin:@servername:port:DB11G
#spring.datasource.url = ${spring.datasource.url}
spring.datasource.driver.class=oracle.jdbc.driver.OracleDriver
spring.datasource.username = dbUser
spring.datasource.password = password

My application with datasource default settings run well.

this is my code:

spring.datasource.url = ${db.url}
spring.datasource.driver.class=oracle.jdbc.driver.OracleDriver
spring.datasource.username = dbUser
spring.datasource.password = dbPassword

Main class

@SpringBootConfiguration
public class IdsFeApplication implements ApplicationRunner{



    private static final String FEC_CODEX = "A";

    @Autowired
    private static ConfigInfoDB infoDb;

    @Autowired
    private Login fec;






      public static void main(String[] args) throws InterruptedException {
            SpringApplication bootApp = new SpringApplication(IdsFeApplication.class);
            bootApp.setBannerMode(Banner.Mode.OFF);
            bootApp.setLogStartupInfo(false);
            ConfigurableApplicationContext context = bootApp.run(args);
            ConfigInfoDB db=context.getBean(ConfigInfoDB.class);
            db.dbInfo();


    }

    @Override
    public void run(ApplicationArguments args) throws Exception {
        // TODO Auto-generated method stub

        fec.token(FEC_CODEX);


    }

}