正常关机失败

Question

我有一个带服务器的spring boot 2.3应用程序。shutdown=优雅，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，但不是优雅地关闭，并且由于从部署脚本调用关闭，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，但我如何检查它呢？

Answer 1

我们在git lab管道中遇到了同样的问题，我已经更改了管道，先停止现有的应用程序，然后替换新的jar文件。希望这能解决这个问题。

Answer 2

如果在jar仍在运行时替换或重命名jar，则可能会出现此问题。Java在启动时不会将整个jar放在内存中，当需要加载某些类时，会对jar中的类使用引用。但是重命名jar或替换jar可能会搞乱jar中的类引用。因此，java在运行时找不到要加载的类，您将看到这个ClassNotFoundException。

可能的解决方法：在替换或重命名jar之前尝试关闭应用程序。