正常关机失败

Question

我有一个带有 server.shutdown=graceful 的 spring boot 2.3+ 应用程序，当关闭时抛出：

 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，因此脚本失败，原因是应用程序关闭调用的退出代码 != 0。

这可能是什么原因？我想我没有长时间运行的任务，这可能会导致这种情况，但是我该如何检查呢？

Answer 1

如果在 jar 仍在运行时替换或重命名 jar，则可能会发生此问题。Java 在启动时不会将整个 jar 放在内存中，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 会弄乱 Jar 中的类引用。因此 java 将找不到您要在运行时加载的类，您将看到此ClassNotFoundException.

Possible workaround: 在替换或重命名 jar 之前尝试关闭应用程序。