我有一个带有 server.shutdown=graceful 的 spring boot 2.3+ 应用程序，当关闭时会抛出：
2020-11-30 11:07:35.485 WARN 3038 --- [SpringContextShutdownHook] o.s.c.support.DefaultLifecycleProcessor : Failed to stop bean 'webServerGracefulShutdown'
java.lang.BootstrapMethodError: java.lang.NoClassDefFoundError: org/springframework/boot/web/server/GracefulShutdownResult
at org.springframework.boot.web.servlet.context.WebServerGracefulShutdownLifecycle.stop(WebServerGracefulShutdownLifecycle.java:51)
at org.springframework.context.support.DefaultLifecycleProcessor.doStop(DefaultLifecycleProcessor.java:238)
at org.springframework.context.support.DefaultLifecycleProcessor.access$300(DefaultLifecycleProcessor.java:53)
at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.stop(DefaultLifecycleProcessor.java:377)
at org.springframework.context.support.DefaultLifecycleProcessor.stopBeans(DefaultLifecycleProcessor.java:210)
at org.springframework.context.support.DefaultLifecycleProcessor.onClose(DefaultLifecycleProcessor.java:128)
at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1022)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.doClose(ServletWebServerApplicationContext.java:170)
at org.springframework.context.support.AbstractApplicationContext$1.run(AbstractApplicationContext.java:949)
Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/web/server/GracefulShutdownResult
... 9 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.web.server.GracefulShutdownResult
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:151)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 9 common frames omitted
2020-11-30 11:08:05.486 INFO 3038 --- [SpringContextShutdownHook] o.s.c.support.DefaultLifecycleProcessor : Failed to shut down 1 bean with phase value 2147483647 within timeout of 30000ms: [webServerGracefulShutdown]
2020-11-30 11:08:35.514 INFO 3038 --- [SpringContextShutdownHook] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2020-11-30 11:08:35.519 INFO 3038 --- [SpringContextShutdownHook] o.s.s.c.ThreadPoolTaskScheduler : Shutting down ExecutorService 'taskScheduler'
2020-11-30 11:08:35.520 INFO 3038 --- [SpringContextShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2020-11-30 11:08:35.528 INFO 3038 --- [SpringContextShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
2020-11-30 11:08:35.530 INFO 3038 --- [SpringContextShutdownHook] o.s.s.c.ThreadPoolTaskScheduler : Shutting down ExecutorService
最后，应用程序关闭，但不是正常关闭，并且由于关闭是从部署脚本调用的，因此由于应用程序关闭调用的退出代码 != 0，脚本失败。
这可能是什么原因造成的？我认为我没有长时间运行的任务，这可能会导致这种情况，但我该如何检查它呢？
如果您在 jar 仍在运行时替换或重命名该 jar，则可能会出现此问题。 Java 在启动时不会将整个 jar 放入内存中，而是在需要加载某些类时使用 Jar 中类的引用。但是重命名 jar 或替换 jar 可能会弄乱 Jar 内的类引用。所以java不会在运行时找到你想要加载的类，你会看到这个ClassNotFoundException.
Possible workaround:在更换或重命名 jar 之前尝试关闭应用程序。
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