Cache cache = Redis.use();
String key = "test_key";
String filed = "test_field";
long val = cache.hincrBy(key, filed, 1L);
Map map =  cache.hgetAll(key);

执行代码后，报错空指针，报错信息如下

Exception in thread "Timer-0" java.lang.RuntimeException: java.io.IOException: java.lang.NullPointerException

at com.jfinal.plugin.redis.serializer.FstSerializer.valueFromBytes(FstSerializer.java:78)

at com.jfinal.plugin.redis.Cache.valueFromBytes(Cache.java:1217)

at com.jfinal.plugin.redis.Cache.hgetAll(Cache.java:527)