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[/Servlet_FirstServlet]]

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:1119)

at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1571)

at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1561)

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

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/Servlet_FirstServlet]]

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

... 6 more