I am trying to learn different ways of creating DataSource.
In this example https://github.com/ivoronline/springboot_db_datasource_create_DataSourceBuilder i have used DriverManagerDataSource.class to successfully create Datasource as shown below

application.properties

# ORACLE DB
my.spring.datasource.url      = jdbc:oracle:thin:@localhost:1522/orcl
my.spring.datasource.username = TEST
my.spring.datasource.password = LETMEIN

MyDatabaseConfig

@Configuration
public class MyDatabaseConfig {

  //=========================================================================================================
  // DATA SOURCE
  //=========================================================================================================
  @Bean
  @ConfigurationProperties("my.spring.datasource")
  public DataSource dataSource() {
    return DataSourceBuilder.create().type(DriverManagerDataSource.class).build();
  }

}

But when I try to replace DriverManagerDataSource.class with HikariDataSource.class I get error. I am confused because in this other https://github.com/ivoronline/springboot_db_datasource_SaveSameEntityToDifferetnSchema more complicated project this was working.