调试web项目，项目部署到tomcat，报如下错误：
1 java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[127.0.0.1].StandardContext[]] 2 at java.util.concurrent.FutureTask.report(FutureTask.java:122) 3 at java.util.concurrent.FutureTask.get(FutureTask.java:192) 4 at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:911) 5 at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:890) 6 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 7 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1403) 8 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1393) 9 at java.util.concurrent.FutureTask.run(FutureTask.java:266) 10 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 11 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 12 at java.lang.Thread.run(Thread.java:745) 13 Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[127.0.0.1].StandardContext[]] 14 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) 15 ... 6 more 16 Caused by: org.apache.catalina.LifecycleException: Failed to start component [org.apache.catalina.webresources.StandardRoot@1df93418] 17 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) 18 at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4842) 19 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4974) 20 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 21 ... 6 more 22 Caused by: java.lang.IllegalArgumentException: The main resource set specified [C:UsersLzj.IntelliJIdea2016.2system omcatUnnamed_questionwebappscall] is not valid 23 at org.apache.catalina.webresources.StandardRoot.createMainResourceSet(StandardRoot.java:732) 24 at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:690) 25 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 26 ... 9 more 27 28 22-Oct-2017 17:00:28.227 严重 [main] org.apache.catalina.core.ContainerBase.startInternal A child container failed during start 29 java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[127.0.0.1]] 30 at java.util.concurrent.FutureTask.report(FutureTask.java:122) 31 at java.util.concurrent.FutureTask.get(FutureTask.java:192) 32 at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:911) 33 at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) 34 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 35 at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422) 36 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 37 at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:791) 38 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 39 at org.apache.catalina.startup.Catalina.start(Catalina.java:655) 40 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 41 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 42 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 43 at java.lang.reflect.Method.invoke(Method.java:498) 44 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355) 45 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495) 46 Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[127.0.0.1]] 47 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) 48 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1403) 49 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1393) 50 at java.util.concurrent.FutureTask.run(FutureTask.java:266) 51 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 52 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 53 at java.lang.Thread.run(Thread.java:745) 54 Caused by: org.apache.catalina.LifecycleException: A child container failed during start 55 at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:919) 56 at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:890) 57 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 58 ... 6 more 59 60 22-Oct-2017 17:00:28.230 严重 [main] org.apache.catalina.startup.Catalina.start The required Server component failed to start so Tomcat is unable to start. 61 org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]] 62 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) 63 at org.apache.catalina.startup.Catalina.start(Catalina.java:655) 64 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 65 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 66 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 67 at java.lang.reflect.Method.invoke(Method.java:498) 68 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355) 69 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495) 70 Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]] 71 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) 72 at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:791) 73 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 74 ... 7 more 75 Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]] 76 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) 77 at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422) 78 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 79 ... 9 more 80 Caused by: org.apache.catalina.LifecycleException: A child container failed during start 81 at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:919) 82 at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) 83 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 84 ... 11 more
最后发现是tomcat安装目录/conf/server.xml配置的问题：
因为我之前配置了:
<Engine> <Host name="127.0.0.1" debug="0" appBase="webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Context path="" docBase="call" debug="0" reloadable="true" crossContext="true"/> <Logger className="org.apache.catalina.logger.FileLogger" directory="logs" prefix="tot_log." suffix=".txt" timestamp="true"/> </Host> </Engine>
将这个Host节点注释，问题解决。