org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]]
   at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
   at org.apache.catalina.startup.Catalina.start(Catalina.java:684)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
   at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:456)
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:732)
   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:443)
   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:1131)
   at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302)
   at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
   ... 11 more

解决方案一：把在Tomcat上右键删除后再重新建一个

 

解决方案二：

1:项目名上右键>>properties>>java build path

2:libraries选项卡>>右边Add library>>Server Runtime>>选一个Tomcat>>>finish

3:重新启动