最近生产环境要升级log4j的jar包，于是我下载好了jar包后在测试环境验证了一番，项目启动和服务没有问题。

但是放到生产环境之后，管理台和服务都报错，报错信息如下：

24-May-2023 17:24:31.856 SEVERE [main] org.apache.catalina.startup.HostConfig.deployDirectory Error deploying web application directory [/home/ufts/admin-tomcat/webapps/admin]
	java.lang.IllegalStateException: Error starting child
		at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:720)
		at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
		at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:706)
		at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1184)
		at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1925)
		at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
		at java.util.concurrent.FutureTask.run(FutureTask.java:266)
		at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
		at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:112)
		at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1094)
		at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:476)
		at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1611)
		at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:319)
		at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
		at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423)
		at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366)
		at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:936)
		at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
		at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
		at java.util.concurrent.FutureTask.run(FutureTask.java:266)
		at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
		at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
		at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
		at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.StandardService.startInternal(StandardService.java:434)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.startup.Catalina.start(Catalina.java:772)
		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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:342)
		at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:473)
	Caused by: org.apache.catalina.LifecycleException: Failed to initialize component [org.apache.catalina.webresources.JarResourceSet@5e82df6a]
		at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
		at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:139)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:173)
		at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:726)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4830)
		at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4966)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:717)
		... 37 more
	Caused by: java.lang.IllegalArgumentException: java.util.zip.ZipException: invalid END header (bad central directory offset)
		at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.initInternal(AbstractSingleArchiveResourceSet.java:143)
		at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136)
		... 44 more
	Caused by: java.util.zip.ZipException: invalid END header (bad central directory offset)
		at java.util.zip.ZipFile.open(Native Method)
		at java.util.zip.ZipFile.<init>(ZipFile.java:225)
		at java.util.zip.ZipFile.<init>(ZipFile.java:155)
		at java.util.jar.JarFile.<init>(JarFile.java:166)
		at java.util.jar.JarFile.<init>(JarFile.java:130)
		at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:241)
		at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:226)
		at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.initInternal(AbstractSingleArchiveResourceSet.java:140)
		... 45 more

由于缺乏相关的经验，找不到问题的原因所在，所以我直接丢给了ChatGPT： 

它看了上百行的日志后告诉了我错误的原因，并且还能找出“关键信息”：

 于是我描述了自己的具体操作并且继续问它：

我的的确确是个菜鸟，对ftp传输不太了解，就问了ChatGPT有没有可能在ftp传输文件的过程中出现了问题：

 于是我问了他验证文件完整性的方式：

 OK，哈希校验符合我的心意。但是奈何我也不知道这个命令，不过没关系，可以继续问它：

 此时我已经验证了测试环境和生产环境的jar包哈希值不一致，但是测试环境和我自己云服务器上的哈希值一致，于是可以断定是用ftp命令向生产环境传输的时候出了问题。

那继续问ftp传输怎么保证文件的完整性：

那就问问怎么用二进制模式传输吧：

至此，我用二进制模式传输完文件，发现文件哈希值没有变化，问题解决。

可以发现，ChatGPT对于我这种知识广度有所欠缺的初级开发者还是帮助很大的，能够帮我高效地解决很多问题。