【问题场景】org.springframework.data.redis.serializer.SerializationException: Cannot serialize

1. 问题描述

使用 Spring cloud 开发 web 微服务，微服务之间Session无法共享，需要将Session存入Redis中，实现Session共享。将身份信息包装成类的形式，在向Redis中存储的过程中，发生错误：

org.springframework.data.redis.serializer.SerializationException: Cannot serialize; nested exception is org.springframework.core.serializer.support.SerializationFailedException: Failed to serialize object using DefaultSerializer; nested exception is java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [xyz.yangzhe.crowd.entity.vo.MemberLoginVO]
	at org.springframework.data.redis.serializer.JdkSerializationRedisSerializer.serialize(JdkSerializationRedisSerializer.java:96) ~[spring-data-redis-2.1.9.RELEASE.jar:2.1.9.RELEASE]
	at org.springframework.data.redis.core.AbstractOperations.rawHashValue(AbstractOperations.java:184) ~[spring-data-redis-2.1.9.RELEASE.jar:2.1.9.RELEASE]
	at org.springframework.data.redis.core.DefaultHashOperations.putAll(DefaultHashOperations.java:147) ~[spring-data-redis-2.1.9.RELEASE.jar:2.1.9.RELEASE]
	at org.springframework.data.redis.core.DefaultBoundHashOperations.putAll(DefaultBoundHashOperations.java:147) ~[spring-data-redis-2.1.9.RELEASE.jar:2.1.9.RELEASE]
	at org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.saveDelta(RedisOperationsSessionRepository.java:838) ~[spring-session-data-redis-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.save(RedisOperationsSessionRepository.java:826) ~[spring-session-data-redis-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.session.data.redis.RedisOperationsSessionRepository$RedisSession.access$000(RedisOperationsSessionRepository.java:704) ~[spring-session-data-redis-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.session.data.redis.RedisOperationsSessionRepository.save(RedisOperationsSessionRepository.java:421) ~[spring-session-data-redis-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.session.data.redis.RedisOperationsSessionRepository.save(RedisOperationsSessionRepository.java:247) ~[spring-session-data-redis-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.commitSession(SessionRepositoryFilter.java:240) ~[spring-session-core-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.access$100(SessionRepositoryFilter.java:201) ~[spring-session-core-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:154) ~[spring-session-core-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:85) ~[spring-session-core-2.1.7.RELEASE.jar:2.1.7.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:712) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:384) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:394) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:253) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:348) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:173) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_162]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_162]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.21.jar:9.0.21]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_162]

2. 问题分析

• 序列化：将对象写入到IO流中
• 反序列化：从IO流中恢复对象
• 所有可在网络上传输的对象都必须是可序列化的，比如RMI（remote method invoke,即远程方法调用），传入的参数或返回的对象都是可序列化的，否则会出错

3. 解决

使得要存储Redis的类，实现 Serializable 接口，即可解决

public class DemoData implements Serializable{
	...
}