netty中handler注入依赖为空问题

netty的handler在注入spring管理下的bean时出现了空指针，如下：

63行代码：

不知道是什么原因引起的，下面是解决办法：
1.首先写一个spring的工具类

@Component
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null) {
            SpringUtil.applicationContext = applicationContext;
        }
    }

    //获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    //通过name获取 Bean.
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    //通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }

}

2.更改注入方法：

    //用此方法代替掉autowired注入
    private static ClientLogService clientLogService;
    static {
        clientLogService = SpringUtil.getBean(ClientLogService.class);
    }