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

by 
spring.datasource.url = [url]
spring.datasource.username = [username]
spring.datasource.password = [password]
spring.datasource.driverClassName = oracle.jdbc.OracleDriver

@Bean
@ConfigurationProperties(prefix="spring.datasource")
public DataSource dataSource() {
    return new DataSource();
}

Here the DataSource class has properties url, username, password, driverClassName, so spring boot maps them to the created object.

Example of the DataSource class:

public class DataSource {
    private String url;
    private String driverClassName;
    private String username;
    private String password;
    //getters & setters, etc.
}

In other words this has the same effect as if you initialize some bean with stereotype annotations(@Component, @Service, etc.)
e.g.

@Component
@ConfigurationProperties(prefix="spring.datasource")
public class DataSource {
    private String url;
    private String driverClassName;
    private String username;
    private String password;
    //getters & setters, etc.
}

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