我想问的是，在使用springel的过程中，我想得到map中的值，但是无论我怎么得到，我的值总是null

@Data
@Component("workersHolder")
public class WorkersHolder {
    private Map<String, Integer> salaryByWorkers = new HashMap<>();

    public WorkersHolder() {

        salaryByWorkers.put("John", 35000);
        salaryByWorkers.put("Susie", 47000);
        salaryByWorkers.put("Alex", 12000);
        salaryByWorkers.put("George", 14000);
    }

    public static void main(String[] args) {
        // 35000
        System.out.println(new WorkersHolder().salaryByWorkers.get("John"));
    }

}

@Data
@Component
public class GetData {

    @Value("#{workersHolder.salaryByWorkers['John']}")
    private Integer johnSalary;

    @Value("#{workersHolder.salaryByWorkers['George']}")
    private Integer georgeSalary;

    @Value("#{workersHolder.salaryByWorkers['Susie']}")
    private Integer susieSalary;

    public static void main(String[] args) {
        // null
        // Hope this line can output 35000
       System.out.println(new GetData().johnSalary);
    }
}

粗体行打印的是35000，但是为空，请问有没有做错的地方，有什么想法欢迎提供给我，谢谢