springboot无法从静态上下文中引用非静态变量的解决方法

@PropertySource(value = {"classpath:config/application.yml"},ignoreResourceNotFound = true,encoding="UTF-8") @Service public class tank_task {    private static String kafka;    public static String getProfilesKafka() {     return kafka;   }    @Value("${stream.kafka.servers}")   public void setProfilesKafka(String kafka) {     tank_task.kafka = kafka;   }    public static void tank_test(){      System.out.println("config static kafka :" + tank_task.getProfilesKafka());   } }