tomcat启动时出现这个问题显示严重开始事件引发异常求指导。

7月 13, 2021 11:30:46 上午 org.apache.tomcat.util.digester.Digester startElement
严重: 开始事件引发异常
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest

java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
你没导入对应的包servlet-api.jar包

org.apache.tomcat.util.digester.Digester startElement
严重: 开始事件引发异常
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1010)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at java.base/java.net.URLClassLoader.defineClass(URLClassLoader.java:512)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:420)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:414)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:691)
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:413)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:586)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3334)
at java.base/java.lang.Class.privateGetPublicMethods(Class.java:3359)
at java.base/java.lang.Class.getMethods(Class.java:1990)
at org.apache.tomcat.util.IntrospectionUtils.findMethods(IntrospectionUtils.java:413)
at org.apache.tomcat.util.IntrospectionUtils.setProperty(IntrospectionUtils.java:71)
at org.apache.tomcat.util.digester.SetPropertiesRule.begin(SetPropertiesRule.java:101)
at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1277)
at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:518)
at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:183)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1386)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2725)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:605)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:541)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:888)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:824)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1224)
at java.xml/com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:635)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1535)
at org.apache.catalina.startup.Catalina.parseServerXml(Catalina.java:617)
at org.apache.catalina.startup.Catalina.load(Catalina.java:709)
at org.apache.catalina.startup.Catalina.load(Catalina.java:746)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:305)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:475)
Caused by: java.lang.ClassNotFoundException: javax.servlet.http.HttpServletRequest
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:433)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:586)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
... 39 more

java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1010)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:150)
at java.base/java.net.URLClassLoader.defineClass(URLClassLoader.java:512)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:420)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:414)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:691)
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:413)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:586)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3334)
at java.base/java.lang.Class.privateGetPublicMethods(Class.java:3359)
at java.base/java.lang.Class.getMethods(Class.java:1990)
at org.apache.tomcat.util.IntrospectionUtils.findMethods(IntrospectionUtils.java:413)
at org.apache.tomcat.util.IntrospectionUtils.setProperty(IntrospectionUtils.java:71)
at org.apache.tomcat.util.digester.SetPropertiesRule.begin(SetPropertiesRule.java:101)
at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1277)
at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:518)
at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:183)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1386)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2725)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:605)
at java.xml/com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:541)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:888)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:824)
at java.xml/com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1224)
at java.xml/com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:635)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1535)
at org.apache.catalina.startup.Catalina.parseServerXml(Catalina.java:617)
at org.apache.catalina.startup.Catalina.load(Catalina.java:709)
at org.apache.catalina.startup.Catalina.load(Catalina.java:746)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:305)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:475)
Caused by: java.lang.ClassNotFoundException: javax.servlet.http.HttpServletRequest
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:433)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:586)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
... 39 more

是否引入servlet-api.jar项目是否部署到tomcat上