嚴(yán)重: A child container failed during start

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/HelloWorld]]

at java.util.concurrent.FutureTask.report(Unknown Source)

at java.util.concurrent.FutureTask.get(Unknown Source)

at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:951)

at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:839)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1429)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)

at java.util.concurrent.FutureTask.run(Unknown Source)

at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)

at java.util.concurrent.AbstractExecutorService.submit(Unknown Source)

at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:944)

at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:261)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

at org.apache.catalina.startup.Catalina.start(Catalina.java:682)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:350)

at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:492)