springboot Redistemplate 之 EOFException: null and not found key

EOFException

jdk1.8 描述

今天 想着 使用 redis 实现一把 分布式 锁，健了一个 springboot 项目，引入 redis 依赖，写个前端控制器，再往控制器里面写个模拟减库存的 的逻辑，OK 启动项目单机测试一下，一切都是那么顺滑。

一气呵成 哈哈哈。。。等待浏览器 返回那 OK 一文。
。。。
1 秒
2 秒
3 秒
。。。
6 秒
我感觉我等了一年。。。
结果返回了一堆。。。
立马 看一下 后台 打印

2020-05-22 17:33:44.038 ERROR 31996 --- [nio-9999-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause

java.lang.NullPointerException: null
	at com.nn.redis.controller.RedisController.kc(RedisController.java:25) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_181]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_181]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]

NullPointerException 空指针 异常，这就有点过分了哈。。。。打脸了。。额
立马 查看 redis 是否 有该：num 健。
这不是有嘛
难道 redis 链接错了？
我就起了一个本地redis，链接不上 也会报 连接异常呀!思前想后，是不是 没有设置 key 序列化呀？所以在 redis中找不到呢？
那就加上。。。。。OK 这下 加上了吧！ 走起，访问一下。。。
。。。
。。。
。。。
我这又是等了一年。。叫他返回一个 OK 就有那么难吗？ 还磨磨唧唧的

原来 又赠送 我一堆 好东西了

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.
Fri May 22 17:46:19 CST 2020
There was an unexpected error (type=Internal Server Error, status=500).
Cannot deserialize; nested exception is org.springframework.core.serializer.support.SerializationFailedException: Failed to deserialize payload. Is the byte array a result of corresponding serialization for DefaultDeserializer?; nested exception is java.io.EOFException

看一下后台 打印，好家伙 去了一个NullPointerException: null
来了一个 EOFException: null（什么是 EOF 异常 上面有贴哈。。。）

2020-05-22 17:46:19.907 ERROR 4696 --- [nio-9999-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.data.redis.serializer.SerializationException: Cannot deserialize; nested exception is org.springframework.core.serializer.support.SerializationFailedException: Failed to deserialize payload. Is the byte array a result of corresponding serialization for DefaultDeserializer?; nested exception is java.io.EOFException] with root cause

java.io.EOFException: null
	at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2681) ~[na:1.8.0_181]
	at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:3156) ~[na:1.8.0_181]
	at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:863) ~[na:1.8.0_181]
	at java.io.ObjectInputStream.<init>(ObjectInputStream.java:358) ~[na:1.8.0_181]
	at org.springframework.core.ConfigurableObjectInputStream.<init>(ConfigurableObjectInputStream.java:65) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.core.ConfigurableObjectInputStream.<init>(ConfigurableObjectInputStream.java:51) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.core.serializer.DefaultDeserializer.deserialize(DefaultDeserializer.java:70) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.core.serializer.support.DeserializingConverter.convert(DeserializingConverter.java:73) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.core.serializer.support.DeserializingConverter.convert(DeserializingConverter.java:36) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.data.redis.serializer.JdkSerializationRedisSerializer.deserialize(JdkSerializationRedisSerializer.java:82) ~[spring-data-redis-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.redis.core.AbstractOperations.deserializeValue(AbstractOperations.java:335) ~[spring-data-redis-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	at org.springframework.data.redis.core.AbstractOperations$ValueDeserializingRedisCallback.doInRedis(AbstractOperations.java:61) ~[spring-data-redis-2.2.6.RELEASE.jar:2.2.6.RELEASE]
	

思钱 想后，坑定时 redis 这个 key 有问题，回想起 这个 num 我是 使用redis cli.exe 设置进去的，是不是这个问题，具体底层暂时不深究，我得想完成 分布式锁啊！先把问题解决。

那 我就再 测试一下，我用 RedisTemplate 往 redis 中再添加一个（key：num2，value：100），然后再取出，看看 是否正常。

还是要检查一下 redis 中是否有 num2 保险起见，注意看 它的 value哟
接下来 再次走一遍，看看

来罗来罗，它真的来罗。。。。。

后台打印呢？

OK 问题就是 key
两种方式 不一样，具体原因下篇分享，我还得 赶工呢。。。。

在这里先记录一下 遇到的问题。