yml is described as follows

application:
   address:
    "0xb7716e1f5690a841d698dd64ae13727bf719b2cd": "4"
    "0x0f020200ad0729f19be98ddb26685d80359428b7": "5"

by injecting

  import org.springframework.core.env.Environment;
  @Autowired
  Environment environment;


 Map<String,String> maps = environment.getProperty("application.address",Map.class);

it is fetched through environment in the method. If it returns null, what should I do?