前言

ruoyi 4.6.0
jdk1.8

错误

11:48:16.879 [http-nio-9031-exec-25] INFO  c.r.f.s.r.UserRealm - [doGetAuthenticationInfo,128] - 对用户[admin]进行登录验证..验证未通过{}
java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@3da77167 rejected from com.ruoyi.common.config.thread.ThreadPoolConfig$1@4067159a[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2063)at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:830)at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:326)at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:533)at com.ruoyi.framework.manager.AsyncManager.execute(AsyncManager.java:48)at com.ruoyi.framework.shiro.service.SysLoginService.login(SysLoginService.java:106)at com.ruoyi.framework.shiro.realm.UserRealm.doGetAuthenticationInfo(UserRealm.java:100)at org.apache.shiro.realm.AuthenticatingRealm.getAuthenticationInfo(AuthenticatingRealm.java:571)at org.apache.shiro.authc.pam.ModularRealmAuthenticator.doSingleRealmAuthentication(ModularRealmAuthenticator.java:180)at org.apache.shiro.authc.pam.ModularRealmAuthenticator.doAuthenticate(ModularRealmAuthenticator.java:273)at org.apache.shiro.authc.AbstractAuthenticator.authenticate(AbstractAuthenticator.java:198)at org.apache.shiro.mgt.AuthenticatingSecurityManager.authenticate(AuthenticatingSecurityManager.java:106)at org.apache.shiro.mgt.DefaultSecurityManager.login(DefaultSecurityManager.java:275)at org.apache.shiro.subject.support.DelegatingSubject.login(DelegatingSubject.java:260)at com._3jcf.sso.open.login.SysLoginController.ajaxLogin(SysLoginController.java:65)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)at javax.servlet.http.HttpServlet.service(HttpServlet.java:652)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:450)at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:124)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:888)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1597)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:748)

现象和原因

开发过程中，遇到该问题
以spring boot方式启动项目
刚启动时，没有上述问题
当修改过代码、项目自动重启后，在登录页面输入账号和密码登录时，出现上述错误。

java.util.concurrent.RejectedExecutionException: 
Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@3da77167 rejected 
from com.ruoyi.common.config.thread.ThreadPoolConfig$1@4067159a
[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0]

上面这段错误信息是对错误原因的描述，其含义为：

java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask 表示内部类。在java.util.concurrent.ScheduledThreadPoolExecutor类中定义的内部类。
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@3da77167内部类的hash code为3da77167（视作唯一标识）。
com.ruoyi.common.config.thread.ThreadPoolConfig$1表示匿名类（没名字，用数字编号表示，大郎、二郎、…）。
com.ruoyi.common.config.thread.ThreadPoolConfig$1@4067159a 匿名类的hash code为4067159a。
检查代码，发现 com.ruoyi.common.config.thread.ThreadPoolConfig$1 是 java.util.concurrent.ScheduledThreadPoolExecutor 的子类。
java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@3da77167 rejected from com.ruoyi.common.config.thread.ThreadPoolConfig$1@4067159a[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0] 表示：hash code 为 4067159a 的 Object 下的 hash code 为 3da77167 的成员 Object（4067159a的属性3da77167），抛出了RejectedExecutionException，因为ScheduledThreadPoolExecutor已处于Terminated状态（结束了，来晚了），你看 pool size = 0。

本错误的原因为:

使用 AsyncManager作为任务执行器。AsyncManager访问 com.ruoyi.common.config.thread.ThreadPoolConfig$1@4067159a Bean。
AsyncManager 为单例模式。
项目退出时，对 com.ruoyi.common.config.thread.ThreadPoolConfig$1@4067159a Bean 做了关闭（shutdonw）动作。
spring boot 的热启动未重新执行单例的初始化过程，且获取AsyncManager 的单例对象时未检查 com.ruoyi.common.config.thread.ThreadPoolConfig$1@4067159a Bean的状态，导致 AsyncManager 持有的是已关闭的 com.ruoyi.common.config.thread.ThreadPoolConfig$1@4067159a Bean。
因此，错误发生了。