java.lang.IllegalStateException: 啟動子級時出錯
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: 無法啟動組件[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/FileItemFactoryat 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練習的時候，遇到了這樣的問題，在這之前我測試過jsp和服務器是連通的，jar包也導入過了，但是寫完代碼卻出現了這樣的問題，org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:269)，根據提示可以確認是jar包的問題，重新檢查了一下，發現是導入jar包直接導入進WEB-INF里面了（大無語~），重新新建了文件夾，導入了jar包，問題得到了解決。

另外，需要注意的是，IDEA不同于eclipse，eclipse導入jar包是需要build path，直接復制粘貼過來是不行的，還需要添加到項目工程里面，還需要有下面這一步。

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