org.apache.catalina.startup.HostConfig.deployWAR Error deploying web application archive

昨天23点给一个老项目改完打包发布到云服务器后报错，Tomcat9 启动不了，白折腾了我几个小时。

这错误以前遇到过，由于太过久远已经忘记，特此记录

错误日志

22-Dec-2021 23:52:18.703 SEVERE [main] org.apache.catalina.startup.HostConfig.deployWAR Error deploying web application archive [/usr/tomcat/webapps/project.war]

    java.lang.IllegalStateException: Error starting child

        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:731)

        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:700)

        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:696)

        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1024)

        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1911)

        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.deployWARs(HostConfig.java:825)

        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:475)

        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1618)

        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:948)

        at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:835)

        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)

        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1388)

        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:921)

        at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:263)

        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

        at org.apache.catalina.core.StandardService.startInternal(StandardService.java:437)

        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

        at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:934)

        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:345)

        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:476)

    Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/project]]

        at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)

        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)

        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:728)

        ... 37 more

过程

我的环境是 CentenOS7 + Tomcat9 + jdk8 + Springboot2.*

报错后我在网上查了很多资料，解决办法五花八门

然并卵，大部分帖子一如既往的废话。

网上纷纭

1、有说改 JAVA_HOME 下 jre/lib 下某个和随机数相关的配置（改了，没用）

2、有说换 Tomcat 大版本的（没试过、麻烦）

3、有说改 Tomcat conf 下 c.. 某某配置文件的（一看就没用）

4、有说 jdk 低了的（我的是1.8，所以不可能）

5、有说 Spring***框架相关环境版本不一致的（只要在编辑器里能跑一般不存在）

5、一个靠谱点的帖子： Tomcat/conf/server.xml 里面 Host 节点下 Context 节点的 docBase 属性对应的项目错误（这个有可能，但我的没问题）

解决办法

最终！我看到了一个评论（评论：考虑是否重复打包），一下子茅塞顿开，想起了以前是怎么解决的。

三下五除二！清空了 target 文件夹，再次打包，发布，成功！