解决ThreadLocal获取不到值大坑

Map<String, Claim> claimMap = JwtUtil.verifyToken(headerToken);
if (null == claimMap) {
    throw new GlobalException(ResponseEnums.TOKEN_INVALID_ERROR);
}
//将参数放入上下文中
Map<String, Object> result = new HashMap<>();
Set<Map.Entry<String, Claim>> entrySet = claimMap.entrySet();
for (Map.Entry<String, Claim> claimEntry : entrySet) {
    result.put(claimEntry.getKey(), claimEntry.getValue().asString());
}
//将用户ID存到ThreadLocal中，以便后续的获取使用
ThreadLocalUtil.getInstance().setContext(result);

@Slf4j
public class ThreadLocalUtil {
    private static final ThreadLocal<Map<String, Object>> CONTEXT = new ThreadLocal<>();
    private ThreadLocalUtil() {}
    public static ThreadLocalUtil getInstance() {
        return SingletonHolder.INSTANCE;
    }
    private static class SingletonHolder {
        private static final ThreadLocalUtil INSTANCE = new ThreadLocalUtil();
    }
    public void setContext(Map<String, Object> map) {
        CONTEXT.set(map);
    }
    public static Map<String, Object> getContext() {
        return CONTEXT.get();
    }
    public void clear() {
        CONTEXT.remove();
    }
    public static Integer getUserId() {
        Map<String, Object> context = getContext();
        if(context == null || !context.containsKey(JwtUtil.USER_ID)) {
            throw new GlobalException(ResponseEnums.TOKEN_IS_NULL_ERROR);
        }
        return Integer.parseInt(String.valueOf(context.get(JwtUtil.USER_ID)));
    }
}

public static void main(String[] args) {
    HashMap<String,Object> map = new HashMap<>();
    map.put(JwtUtil.USER_ID,"1");
    ThreadLocalUtil.getInstance().setContext(map);
    System.out.println(ThreadLocalUtil.getUserId());
}

public static void main(String[] args) {
    HashMap<String,Object> map = new HashMap<>();
    map.put(JwtUtil.USER_ID,"1");
    ThreadLocalUtil.getInstance().setContext(map);
    List<Integer> list = new ArrayList<>();
    list.add(1);
    list.add(2);
    list.add(3);
    //ThreadLocal获取值放在stream里面执行
    list.parallelStream().filter(x -> x.equals(ThreadLocalUtil.getUserId())).collect(Collectors.toList());
}

public static void main(String[] args) {
    HashMap<String,Object> map = new HashMap<>();
    map.put(JwtUtil.USER_ID,"1");
    ThreadLocalUtil.getInstance().setContext(map);
    List<Integer> list = new ArrayList<>();
    list.add(1);
    list.add(2);
    list.add(3);
    //单独拿出来执行
    Integer userId = ThreadLocalUtil.getUserId();
    list.parallelStream().filter(x -> x.equals(userId)).collect(Collectors.toList());
}