参考： https://bbs.csdn.net/topics/392090371
1 omcat无法启动，报如下错误： 2 严重: A child container failed during start 3 java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]] 4 at java.util.concurrent.FutureTask.report(Unknown Source) 5 at java.util.concurrent.FutureTask.get(Unknown Source) 6 at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1119) 7 at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819) 8 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) 9 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1571) 10 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1561) 11 at java.util.concurrent.FutureTask.run(Unknown Source) 12 at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 13 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 14 at java.lang.Thread.run(Unknown Source) 15 Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]] 16 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153) 17 ... 6 more 18 Caused by: java.lang.NoClassDefFoundError: Lorg/apache/commons/logging/Log; 19 at java.lang.Class.getDeclaredFields0(Native Method) 20 at java.lang.Class.privateGetDeclaredFields(Unknown Source) 21 at java.lang.Class.getDeclaredFields(Unknown Source) 22 at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106) 23 at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:270) 24 at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:139) 25 at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:65) 26 at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:416) 27 at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:890) 28 at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:387) 29 at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117) 30 at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) 31 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5503) 32 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) 33 ... 6 more 34 Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.Log 35 at java.net.URLClassLoader$1.run(Unknown Source) 36 at java.net.URLClassLoader$1.run(Unknown Source) 37 at java.security.AccessController.doPrivileged(Native Method) 38 at java.net.URLClassLoader.findClass(Unknown Source) 39 at java.lang.ClassLoader.loadClass(Unknown Source) 40 at java.lang.ClassLoader.loadClass(Unknown Source) 41 ... 20 more
解决办法：
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging-api</artifactId>
<version>1.1</version>
</dependency>