Error log as below:
SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]] at java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.util.concurrent.FutureTask.get(FutureTask.java:188) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) ... 6 more Caused by: java.lang.NoSuchMethodError: javax.servlet.ServletContext.getClassLoader()Ljava/lang/ClassLoader; at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:210) at org.apache.catalina.startup.ContextConfig.processJarsForWebFragments(ContextConfig.java:1872) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1119) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:771) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5066) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 6 more 七月 11, 2015 9:40:22 下午 org.apache.catalina.core.ContainerBase startInternal SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/WebSysAdmin]] at java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.util.concurrent.FutureTask.get(FutureTask.java:188) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/WebSysAdmin]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) ... 6 more Caused by: java.lang.NoSuchMethodError: javax.servlet.ServletContext.getClassLoader()Ljava/lang/ClassLoader; at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:210) at org.apache.catalina.startup.ContextConfig.processJarsForWebFragments(ContextConfig.java:1872) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1119) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:771) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5066) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 6 more 七月 11, 2015 9:40:22 下午 org.apache.catalina.core.ContainerBase startInternal SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]] at java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.util.concurrent.FutureTask.get(FutureTask.java:188) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:439) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:769) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.startup.Catalina.start(Catalina.java:625) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485) Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.catalina.LifecycleException: A child container failed during start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:924) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 6 more 七月 11, 2015 9:40:22 下午 org.apache.catalina.startup.Catalina start SEVERE: The required Server component failed to start so Tomcat is unable to start. org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8006]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.startup.Catalina.start(Catalina.java:625) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485) Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:769) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 7 more Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:439) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 9 more Caused by: org.apache.catalina.LifecycleException: A child container failed during start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:924) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 11 more 七月 11, 2015 9:40:22 下午 org.apache.coyote.AbstractProtocol pause INFO: Pausing ProtocolHandler ["http-nio-8090"] 七月 11, 2015 9:40:22 下午 org.apache.coyote.AbstractProtocol pause INFO: Pausing ProtocolHandler ["ajp-nio-8010"] 七月 11, 2015 9:40:22 下午 org.apache.catalina.core.StandardService stopInternal INFO: Stopping service Catalina 七月 11, 2015 9:40:22 下午 org.apache.coyote.AbstractProtocol destroy INFO: Destroying ProtocolHandler ["http-nio-8090"] 七月 11, 2015 9:40:22 下午 org.apache.coyote.AbstractProtocol destroy SEVERE: Failed to destroy end point associated with ProtocolHandler ["http-nio-8090"] java.lang.NullPointerException at org.apache.tomcat.util.net.NioEndpoint.releaseCaches(NioEndpoint.java:304) at org.apache.tomcat.util.net.NioEndpoint.unbind(NioEndpoint.java:480) at org.apache.tomcat.util.net.AbstractEndpoint.destroy(AbstractEndpoint.java:818) at org.apache.coyote.AbstractProtocol.destroy(AbstractProtocol.java:532) at org.apache.catalina.connector.Connector.destroyInternal(Connector.java:1023) at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305) at org.apache.catalina.core.StandardService.destroyInternal(StandardService.java:588) at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305) at org.apache.catalina.core.StandardServer.destroyInternal(StandardServer.java:859) at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305) at org.apache.catalina.startup.Catalina.start(Catalina.java:629) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485) 七月 11, 2015 9:40:22 下午 org.apache.coyote.AbstractProtocol destroy INFO: Destroying ProtocolHandler ["ajp-nio-8010"] 七月 11, 2015 9:40:22 下午 org.apache.coyote.AbstractProtocol destroy SEVERE: Failed to destroy end point associated with ProtocolHandler ["ajp-nio-8010"] java.lang.NullPointerException at org.apache.tomcat.util.net.NioEndpoint.releaseCaches(NioEndpoint.java:304) at org.apache.tomcat.util.net.NioEndpoint.unbind(NioEndpoint.java:480) at org.apache.tomcat.util.net.AbstractEndpoint.destroy(AbstractEndpoint.java:818) at org.apache.coyote.AbstractProtocol.destroy(AbstractProtocol.java:532) at org.apache.catalina.connector.Connector.destroyInternal(Connector.java:1023) at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305) at org.apache.catalina.core.StandardService.destroyInternal(StandardService.java:588) at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305) at org.apache.catalina.core.StandardServer.destroyInternal(StandardServer.java:859) at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:305) at org.apache.catalina.startup.Catalina.start(Catalina.java:629) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485)
Investigation:
Caused by: java.lang.NoSuchMethodError: javax.servlet.ServletContext.getClassLoader()Ljava/lang/ClassLoader;
根据这条错误显示，猜测是java servlet不匹配issue. 联想到当前的eclipse用的是刚new的tomcat 8，可能是项目servlet-api.jar 同tomcat 8 不匹配。
最终解决方法，删除项目工程lib文件夹的低版本的servlet-api.jar, tomcat 8的lib文件夹里用默认带的jar包
或者把tomcat换成7。
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