springboot中redis取缓存类型转换异常
异常如下：
springframework jar包下载[dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.ClassCastException: library.ity.Admin cannot be cast to library.ity.Admin] with root cause java.lang.ClassCastException: library.ity.Admin cannot be cast to library.ity.Admin
at library.ller.AdminController$$EnhancerBySpringCGLIB$$ff9916fe.selectOne(<generated>) ~[classes/:na]
flect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
flect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
flect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
at flect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
at org.hod.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.hod.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.hod.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.hod.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.hod.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.hod.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:626) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
at org.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at at.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.37.jar:9.0.37]
at org.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.
同⼀种类型却出现转换异常：s java.lang.ClassCastException: library.ity.Admin cannot be cast to library.ity.Admin] with root cause
java.lang.ClassCastException: library.ity.Admin cannot be cast to library.ity.Admin
springboot类的加载器：：》》》》SpringBoot中使⽤的⾃动重启技术涉及两个类加载器，⼀个是baseclassloader,⽤来加载不会变化的类，例如项⽬引⽤的第三⽅的jar；另⼀个
是restartclassloader，⽤来加载开发者⾃⼰写的会变化的类。
redis存取对象使⽤了两个不同的加载器，导致同⼀个类在redis存取出现不⼀致情况，所以出现类型转换异常。
所以把<!-- <dependency>-->
<!-- <groupId>org.springframework.boot</groupId>-->
<!-- <artifactId>spring-boot-devtools</artifactId>-->
<!-- <scope>runtime</scope>-->
<!-- <optional>true</optional>-->
<!-- </dependency>-->
注销从重新编译重启就可以了

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