java.lang.IllegalStateException: 启动子级时出错

java.lang.IllegalStateException: 启动子级时出错
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:757)

	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1406)
	at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:827)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:359)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:562)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:796)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:677)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:676)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.apache.catalina.LifecycleException: 无法启动组件[StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
	at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:753)
	... 42 more
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory
	at java.base/java.lang.Class.getDeclaredFields0(Native Method)
	at java.base/java.lang.Class.privateGetDeclaredFields(Class.java:3061)
	at java.base/java.lang.Class.getDeclaredFields(Class.java:2248)
	at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:110)
	at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:269)
	at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:137)
	at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:69)
	at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328)
	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:782)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
	at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5130)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
	... 43 more

最近在用 IDEA练习的时候，遇到了这样的问题，在这之前我测试过jsp和服务器是连通的，jar包也导入过了，但是写完代码却出现了这样的问题，org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:269)，根据提示可以确认是jar包的问题，重新检查了一下，发现是导入jar包直接导入进WEB-INF里面了（大无语~），重新新建了文件夹，导入了jar包，问题得到了解决。

另外，需要注意的是，IDEA不同于eclipse，eclipse导入jar包是需要build path，直接复制粘贴过来是不行的，还需要添加到项目工程里面，还需要有下面这一步。