启动Tomcat报“严重: A child container failed during start java.util.concurrent.ExecutionException:”异常记录

忘是亡心i 2022-02-03 23:04 228阅读 0赞

在启动Tomcat时候出现了以下异常

严重: A child container failed during start
    java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]
    	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
    	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
    	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
    	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    	at java.lang.Thread.run(Thread.java:748)
    Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    	... 6 more
    Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> /*.html in servlet mapping
    	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3245)
    	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3220)
    	at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1367)
    	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1346)
    	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878)
    	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376)
    	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    	... 6 more
    严重: A child container failed during start
    java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost]]
    	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
    	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
    	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
    	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    	at org.apache.catalina.startup.Tomcat.start(Tomcat.java:341)
    	at org.apache.tomcat.maven.plugin.tomcat7.run.AbstractRunMojo.startContainer(AbstractRunMojo.java:1238)
    	at org.apache.tomcat.maven.plugin.tomcat7.run.AbstractRunMojo.execute(AbstractRunMojo.java:592)
    	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
    	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
    	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
    	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
    	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
    	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
    	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
    	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
    	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
    	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
    	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
    	at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
    	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.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
    	at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
    Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost]]
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    	at java.lang.Thread.run(Thread.java:748)
    Caused by: org.apache.catalina.LifecycleException: A child container failed during start
    	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131)
    	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    	... 6 more

这个最开始看到

Caused by: org.apache.catalina.LifecycleException: A child container failed during start

这句，以为是有一个Tomcat开着有影响呢，结果把别的停了之后，发现还是没有解决，又仔细看了异常信息，什么child container，我也没启动什么子容器啊！往上看才发现了真正的问题

Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> /*.html in servlet mapping
    	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3245)

url-pattern写错了？还真是，写成了"/\* .html"应该是要用"\*.html"的。

url-pattern匹配时会先使用精确映射，最长路径映射，扩展映射，都找不到会调用默认的默认的servlet映射，它们的形式分别为：

> **精准映射**：写全映射的路径，如"/a/b/c.action"这样的  
> **路径映射**：以”/’开头和以"/\* “结尾  
> **扩展映射**：以”*.“开头的，如”*.action"、"\*.do"等，分别是使用了action和do扩展作为映射条件  
> **默认servlet映射**：使用"/"进行映射，这种会映射所有的url

所以像"/\*.do"这样就既不是默认的servlet映射，也不是路径映射，也不是扩展映射（也可以说既属于路径映射也属于扩展映射），就自然会报错啦！

**还有一个需要注意的地方，就是"/"和“/\*”的区别：**  
“/“是后面要跟路径，但是不带有扩展名的路径，如“/abc”可以通过,但”/abc.jsp”、“/abc.do”这样的是不会通过的  
"/ \*“则是一种路径映射，代表了路径下的所有文件都可以使用，所有“/abc.jsp”、”/abc.js"这样的都是可以被访问的！