PropertyPlaceholder in spring

AppConfig.java

@Configuration
@ImportResource("classpath:/com/acme/properties-config.xml")
public class AppConfig {
  private @Value("${jdbc.url}") String url;
  private @Value("${jdbc.username}") String username;
  private @Value("${jdbc.password}") String password;
  
  public @Bean DataSource dataSource() {
  return new DriverManagerDataSource(url, username, password);
  }
}

jdbc.properties

jdbc.properties
jdbc.url=jdbc:hsqldb:hsql://localhost/xdb
jdbc.username=sa
jdbc.password=

properties-config.xml

<beans>
<context:property-placeholder location="classpath:/com/acme/jdbc.properties"/>
</beans>