老师，您好，请问一下创建时间和修改时间有效，创建人和修改人取不到，是因为从session中没取到account对象吗？

public class MyMetaObjectHandler implements MetaObjectHandler {


    @Override
    public void insertFill(MetaObject metaObject) {

        if(metaObject.hasSetter("createTime")){
            this.strictInsertFill(metaObject,"createTime", LocalDateTime.class,LocalDateTime.now());
        }

        if(metaObject.hasSetter("createAccountId")){

            Object account = RequestContextHolder.getRequestAttributes()
                    .getAttribute("account", RequestAttributes.SCOPE_SESSION);
            if(account != null){
                Long accountId = ((Account)account).getAccountId();

                this.strictInsertFill(metaObject,"createAccountId",Long.class,accountId);
            }
        }
    }

    @Override
    public void updateFill(MetaObject metaObject) {

        if(metaObject.hasSetter("modifiedTime")){
            this.strictUpdateFill(metaObject,"modifiedTime", LocalDateTime.class,LocalDateTime.now());
        }

        if(metaObject.hasSetter("modifiedAccountId")){

            Object account = RequestContextHolder.getRequestAttributes()
                    .getAttribute("account", RequestAttributes.SCOPE_SESSION);
            if(account != null){

                Long accountId = ((Account)account).getAccountId();

                this.strictUpdateFill(metaObject,"modifiedAccountId",Long.class,accountId);
            }
        }
    }
}