redis存取list＜T＞，及bug：Failed to serialize object of type: class com.google.common.collect.Lists$Revers

Redis存取List

实体类必须序列化，对于redis这种nosql数据库，实例化很重要，很多文章也都介绍了必须实例化，在配置redisTemplate时也会配置序列化规则：

<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"><property name="connectionFactory" ref="jedisConnectionFactory" /><property name="KeySerializer"><beanclass="org.springframework.data.redis.serializer.StringRedisSerializer"></bean></property><property name="ValueSerializer"><beanclass="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"></bean></property><property name="HashKeySerializer"><beanclass="org.springframework.data.redis.serializer.StringRedisSerializer"></bean></property><property name="HashValueSerializer"><beanclass="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"></bean></property></bean>

redis存取List api

//存入List<T>，需要实现序列化
public <T> void putCache(JedisCluster jedisCluster,String key ,List<T> list,Integer liveSeconds){  log.info("===========putCache===========key:"+key);try {  if (null==liveSeconds ) {jedisCluster.set(SerializationUtils.serialize(cacheConfig.getPreFixKey(key).getBytes()) ,SerializationUtils.serialize(list));} else {jedisCluster.setex(SerializationUtils.serialize(cacheConfig.getPreFixKey(key).getBytes()), liveSeconds, SerializationUtils.serialize(list));}} catch (Exception e) {  log.error("Set key error : "+e);  }  }  //取List<T>需要实现反序列化public <T> List<T> getCache(JedisCluster jedisCluster,String key){ log.info("===========getCache===========key:"+key);byte[] in = jedisCluster.get(SerializationUtils.serialize(cacheConfig.getPreFixKey(key).getBytes()));if (null == in) {return null;}else{List<T> list = (List<T>) SerializationUtils.deserialize(in);  return list; }}  //命名key的规则public String getPreFixKey(String key){return String.format("%s:%s",namespace,key);}

SerializationUtils类

不管是存入还是取出，都是通过字节流，这也是序列化的原因。

public abstract class SerializationUtils {/*** Serialize the given object to a byte array.* @param object the object to serialize* @return an array of bytes representing the object in a portable fashion*/@Nullablepublic static byte[] serialize(@Nullable Object object) {if (object == null) {return null;}ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);try {ObjectOutputStream oos = new ObjectOutputStream(baos);oos.writeObject(object);oos.flush();}catch (IOException ex) {throw new IllegalArgumentException("Failed to serialize object of type: " + object.getClass(), ex);}return baos.toByteArray();}/*** Deserialize the byte array into an object.* @param bytes a serialized object* @return the result of deserializing the bytes*/@Nullablepublic static Object deserialize(@Nullable byte[] bytes) {if (bytes == null) {return null;}try {ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bytes));return ois.readObject();}catch (IOException ex) {throw new IllegalArgumentException("Failed to deserialize object", ex);}catch (ClassNotFoundException ex) {throw new IllegalStateException("Failed to deserialize object type", ex);}}}

bug：Failed to serialize object of type: class com.google.common.collect.Lists$Revers

产生这个bug的原因是因为Lists.Revers没有实现序列化，所以存入redis的时候会报这个错误，当时遇到这个bug也查了好长时间，最后看这个Lists.Revers源码才发现这个问题。包括Lists.partition()，List.subList()等都没有实现序列化。

解决

将Lists.Revers、Lists.partition()，List.subList()等重新装入到已经实现序列化的list中去，问题解决

//Lists.Revers转list
List<User> list = new LinkedList<User>();
List<User> resutlListReverse = Lists.reverse(resutlList);
list.addAll(resutlListReverse);
//List.subList转list
List<User> subList = List.subList(0,10);
list.addAll(subList);

redis存取list＜T＞，及bug：Failed to serialize object of type: class com.google.common.collect.Lists$Revers相关推荐

java连接redis存取数据(详细)
声明:本文章仅供参考,学无止境,若有不足之处请指出,非常感谢! 源代码+相关工具下载:https://download.csdn.net/download/corleone_4ever/1081125 ...
Redis存取对象集合
今天遇到个使用Redis存取对象集合的问题,百度半天,没个能用的,后来问了下基友,基友说是把集合转成json串,存入Redis,用的时候再做json解析,果然成功了.开心啊,哈哈哈.记录下,希望会帮助 ...
SLF4J: Failed toString() invocation on an object of type [org.eclipse.jetty.websocket.server......
在配置SpringBoot的log时,遇到如下错误: SLF4J: Failed toString() invocation on an object of type [org.eclipse.jet ...
Failed to register Grid Infrastructure type ora.mdns.type
安装11g的集群软件的时候,在最后运行root.sh脚本时候,没有执行成功,最后提示如下错误: [root@r2 ~]# /u01/app/11.2.0/grid_1/root.sh Performi ...
解决argo workflow报错：MountVolume.SetUp failed for volume “docker-sock“ : hostPath type check failed
提交workflow时报错: MountVolume.SetUp failed for volume "docker-sock" : hostPath type check fai ...
Failed to convert value of type 'java.lang.String' to required type 'java.util.Date
异常原因:Controller层获取JSP页面请求参数是String类型,而在Controller层接收时使用Date类型,属于方法参数类型不匹配异常警告: Failed to bind reque ...
成功解决：Caused by: ParsingException[Failed to parse object: expecting token of type [START_OBJECT] but
前言在根据镜像elasticsearch创建容器的时候,启动容器失败. 查看报错日志查看日志这里查看相关容器启动失败日志 docker logs e09 [root@localhost elas ...
Failed to convert value of type ‘java.lang.String‘ to required type ‘java.util.Date‘；
在Java的controller中添加一个方法即可解决 /*** 解决:Failed to convert value of type 'java.lang.String' to required t ...
Java中使用Jedis连接Redis服务端时提示:JedisConnectionException: Failed connecting
场景 Centos中Redis的下载编译与安装(超详细): https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/103967334 Re ...