Tomcat启动项目时出现严重 org.apache.catalina.core.StandardContext.filterStart 启动过滤器异常（解决办法）

Tomcat启动项目时出现严重 org.apache.catalina.core.StandardContext.filterStart 启动过滤器异常（解决办法）：

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问题描述

报错如下：

严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.StandardContext.filterStart 启动过滤器异常
	java.lang.ClassNotFoundException: org.springframework.web.filter.CharacterEncodingFilter
		at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1407)
		at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1215)
		at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:539)
		at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:520)
		at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:150)
		at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:250)
		at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:102)
		at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4613)
		at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5256)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:728)
		at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:700)
		at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:696)
		at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1783)
		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 org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:293)
		at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:809)
		at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
		at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:460)
		at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:408)
		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 org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:293)
		at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:809)
		at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
		at java.management/com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)
		at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1466)
		at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1307)
		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)

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原因分析：

发布的项目没有导入依赖。

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解决方案：

在idea中选择Project Structure——Project Settings——Artifact，发现WEB-INF下只有classes，没有lib；可以手动创建lib同时在右侧Available Elements对应项目右键选择Put into Output Root，问题即可解决！！