A null pointer exception occurred while updating data in redis to the database

I made a blog project, I want to realize that every time users click on the blog, the page views will be automatically updated, I use redis to store data, and every once in a while, the data in redis will be updated to the database, but when I want to update the current login user id to the database, an exception occurs. I was hoping you could help me figure out what the problem is, thank you.

This is my implementation class:

@Componentpublic class UpdateViewCountJob {    @Autowired    private RedisCache redisCache;    @Autowired    private ArticleService articleService;    @Scheduled(cron = "0/5 * * * * ?")    public void updateViewCount(){        //获取redis中的浏览量        Map<String, Integer> viewCountMap = redisCache.getCacheMap("article:viewCount");        List<Article> articles = viewCountMap.entrySet().stream()                .map(entry -> new Article(Long.valueOf(entry.getKey()), entry.getValue().longValue()))                .collect(Collectors.toList());        Long userId = SecurityUtils.getUserId();        for (Article article : articles) {            article.setUpdateBy(userId);        }        //更新到数据库中        articleService.updateBatchById(articles);    }}

This is the class for the auto-fill function I implemented with mybatisplus:

@Componentpublic class MyMetaObjectHandler implements MetaObjectHandler {    @Override    public void insertFill(MetaObject metaObject) {        Long userId = null;        userId = SecurityUtils.getUserId();        this.setFieldValByName("createTime", new Date(), metaObject);        this.setFieldValByName("createBy",userId , metaObject);        this.setFieldValByName("updateTime", new Date(), metaObject);        this.setFieldValByName("updateBy", userId, metaObject);    }    @Override    public void updateFill(MetaObject metaObject) {        this.setFieldValByName("updateTime", new Date(), metaObject);        this.setFieldValByName("updateBy", SecurityUtils.getUserId(), metaObject);    }}

The error message is as follows:

2023-08-05 13:42:05.005 ERROR 20388 --- [   scheduling-1] o.s.s.s.TaskUtils$LoggingErrorHandler    : Unexpected error occurred in scheduled taskjava.lang.NullPointerException: null    at com.blog.framework.utils.SecurityUtils.getLoginUser(SecurityUtils.java:13) ~[classes/:na]    at com.blog.framework.utils.SecurityUtils.getUserId(SecurityUtils.java:29) ~[classes/:na]    at com.blog.job.UpdateViewCountJob.updateViewCount(UpdateViewCountJob.java:32) ~[classes/:na]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_131]    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_131]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_131]    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_131]    at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:84) ~[spring-context-5.3.7.jar:5.3.7]    at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) ~[spring-context-5.3.7.jar:5.3.7]    at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:95) [spring-context-5.3.7.jar:5.3.7]    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_131]    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_131]    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_131]    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_131]    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131]    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131]    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]

SecurityUtils class as follow:

public class SecurityUtils {    /**     * 获取用户     **/    public static LoginUser getLoginUser() {        return (LoginUser) getAuthentication().getPrincipal();    }    /**     * 获取Authentication     */    public static Authentication getAuthentication() {        return SecurityContextHolder.getContext().getAuthentication();    }    public static Boolean isAdmin(){        Long id = getLoginUser().getUser().getId();        return id != null && id.equals(1L);    }    public static Long getUserId() {        return getLoginUser().getUser().getId();    }}

What confused me was that when I commented out the code in MyMetaObjectHandler class that automatically populated the user id there was no error, which is like this:

@Override    public void updateFill(MetaObject metaObject) {        this.setFieldValByName("updateTime", new Date(), metaObject);//        this.setFieldValByName("updateBy", SecurityUtils.getUserId(), metaObject);    }

If you can help me solve this problem, I will be very grateful to you!