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解决“Unable to start embedded Tomcat“错误的完整指南

作者：如若凌风

在使用Spring Boot开发应用程序时,有时可能会遇到"Unable to start embedded Tomcat"的错误,这可能是由多种原因引起的,本文将详细介绍这个错误的常见原因以及解决方法,帮助你快速解决问题并顺利启动应用程序

分析Unable to start embedded Tomcat

近期研习微服务相关知识的过程中出现了Unable to start embedded Tomcat的问题，网上查询了一些相关的解决方式，仍然无法解决，通过比对学习的项目的相关配置，才解决了这个问题

问题产生过程

在学习微服务知识时想要自己搭建一个EurekaServer,使用工具Spring Tool Suite4,通过Maven创建父工程 parent工程，pom.xml配置如下

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.2.5.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	 	<groupId>com.springcloud</groupId>
  		<artifactId>parent</artifactId>
  		<version>0.0.1-SNAPSHOT</version>
		<packaging>pom</packaging>
		<description>springcloud</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<!--引入springcloud的版本-->
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Hoxton.SR3</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

EurekaServer 服务端的相关配置

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>com.springcloud</groupId>
    <artifactId>parent</artifactId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <artifactId>eureka_server</artifactId>
  
  <properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
		</dependency>

		<!--加入安全配置依赖的Jar包-->
<!--		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-security</artifactId>
		</dependency>-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>


	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
  
</project>

EurekaServer - application.properties文件配置

#eureka服务端应用的端口默认是8761
server.port=9001

#表示是否将自己注册到Eureka Server,默认为true,由于当前应用就是Eureka Server,故而设为false
eureka.client.register-with-eureka=false
# 表示是否从Eureka Server获取注册信息,默认为true,因为这是一个单点的Eureka Server,不需要同步其他的Eureka Server节点的数据,故而设为false
eureka.client.fetch-registry=false
eureka.client.service-url.defaultZone: http://localhost:9001/eureka/

服务在启动过程中出现了下面的报错

java.lang.ExceptionInInitializerError: null
	at com.thoughtworks.xstream.XStream.setupConverters(XStream.java:990) ~[xstream-1.4.11.1.jar:1.4.11.1]
	at com.thoughtworks.xstream.XStream.<init>(XStream.java:593) ~[xstream-1.4.11.1.jar:1.4.11.1]
	at com.thoughtworks.xstream.XStream.<init>(XStream.java:515) ~[xstream-1.4.11.1.jar:1.4.11.1]
	at com.thoughtworks.xstream.XStream.<init>(XStream.java:484) ~[xstream-1.4.11.1.jar:1.4.11.1]
	at com.thoughtworks.xstream.XStream.<init>(XStream.java:430) ~[xstream-1.4.11.1.jar:1.4.11.1]
	at com.thoughtworks.xstream.XStream.<init>(XStream.java:397) ~[xstream-1.4.11.1.jar:1.4.11.1]
	at com.netflix.discovery.converters.XmlXStream.<init>(XmlXStream.java:51) ~[eureka-client-1.9.17.jar:1.9.17]
	at com.netflix.discovery.converters.XmlXStream.<clinit>(XmlXStream.java:42) ~[eureka-client-1.9.17.jar:1.9.17]
	at com.netflix.discovery.converters.wrappers.CodecWrappers$XStreamXml.<init>(CodecWrappers.java:358) ~[eureka-client-1.9.17.jar:1.9.17]
	at com.netflix.discovery.converters.wrappers.CodecWrappers.create(CodecWrappers.java:133) ~[eureka-client-1.9.17.jar:1.9.17]
	at com.netflix.discovery.converters.wrappers.CodecWrappers.getEncoder(CodecWrappers.java:75) ~[eureka-client-1.9.17.jar:1.9.17]
	at com.netflix.discovery.converters.wrappers.CodecWrappers.getEncoder(CodecWrappers.java:66) ~[eureka-client-1.9.17.jar:1.9.17]
	at com.netflix.discovery.provider.DiscoveryJerseyProvider.<init>(DiscoveryJerseyProvider.java:77) ~[eureka-client-1.9.17.jar:1.9.17]
	at com.netflix.discovery.provider.DiscoveryJerseyProvider.<init>(DiscoveryJerseyProvider.java:64) ~[eureka-client-1.9.17.jar:1.9.17]
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:78) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[na:na]
	at java.base/java.lang.reflect.ReflectAccess.newInstance(ReflectAccess.java:128) ~[na:na]
	at java.base/jdk.internal.reflect.ReflectionFactory.newInstance(ReflectionFactory.java:350) ~[na:na]
	at java.base/java.lang.Class.newInstance(Class.java:642) ~[na:na]
	at com.sun.jersey.core.spi.component.ComponentConstructor._getInstance(ComponentConstructor.java:193) ~[jersey-core-1.19.1.jar:1.19.1]
	at com.sun.jersey.core.spi.component.ComponentConstructor.getInstance(ComponentConstructor.java:180) ~[jersey-core-1.19.1.jar:1.19.1]
	at com.sun.jersey.core.spi.component.ProviderFactory.__getComponentProvider(ProviderFactory.java:166) ~[jersey-core-1.19.1.jar:1.19.1]
	at com.sun.jersey.core.spi.component.ProviderFactory._getComponentProvider(ProviderFactory.java:159) ~[jersey-core-1.19.1.jar:1.19.1]
	at com.sun.jersey.core.spi.component.ProviderFactory.getComponentProvider(ProviderFactory.java:153) ~[jersey-core-1.19.1.jar:1.19.1]
	at com.sun.jersey.core.spi.component.ProviderServices.getComponent(ProviderServices.java:278) ~[jersey-core-1.19.1.jar:1.19.1]
	at com.sun.jersey.core.spi.component.ProviderServices.getProviders(ProviderServices.java:151) ~[jersey-core-1.19.1.jar:1.19.1]
	at com.sun.jersey.core.spi.factory.MessageBodyFactory.initReaders(MessageBodyFactory.java:175) ~[jersey-core-1.19.1.jar:1.19.1]
	at com.sun.jersey.core.spi.factory.MessageBodyFactory.init(MessageBodyFactory.java:162) ~[jersey-core-1.19.1.jar:1.19.1]
	at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1338) ~[jersey-server-1.19.1.jar:1.19.1]
	at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:180) ~[jersey-server-1.19.1.jar:1.19.1]
	at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:799) ~[jersey-server-1.19.1.jar:1.19.1]
	at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:795) ~[jersey-server-1.19.1.jar:1.19.1]
	at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193) ~[jersey-core-1.19.1.jar:1.19.1]
	at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:795) ~[jersey-server-1.19.1.jar:1.19.1]
	at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:790) ~[jersey-server-1.19.1.jar:1.19.1]
	at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:509) ~[jersey-servlet-1.19.1.jar:1.19.1]
	at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:339) ~[jersey-servlet-1.19.1.jar:1.19.1]
	at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:605) ~[jersey-servlet-1.19.1.jar:1.19.1]
	at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:207) ~[jersey-servlet-1.19.1.jar:1.19.1]
	at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:394) ~[jersey-servlet-1.19.1.jar:1.19.1]
	at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:744) ~[jersey-servlet-1.19.1.jar:1.19.1]
	at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:270) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:106) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4533) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5172) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145) ~[na:na]
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145) ~[na:na]
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.apache.catalina.startup.Tomcat.start(Tomcat.java:467) ~[tomcat-embed-core-9.0.31.jar:9.0.31]
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:107) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:88) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:438) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at eureka_server.EurekaServerApplication.main(EurekaServerApplication.java:11) ~[classes/:na]
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.util.Comparator java.util.TreeMap.comparator accessible: module java.base does not "opens java.util" to unnamed module @74d1dc36
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357) ~[na:na]
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[na:na]
	at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:177) ~[na:na]
	at java.base/java.lang.reflect.Field.setAccessible(Field.java:171) ~[na:na]
	at com.thoughtworks.xstream.core.util.Fields.locate(Fields.java:40) ~[xstream-1.4.11.1.jar:1.4.11.1]
	at com.thoughtworks.xstream.converters.collections.TreeMapConverter.<clinit>(TreeMapConverter.java:50) ~[xstream-1.4.11.1.jar:1.4.11.1]
	... 83 common frames omitted

[2m2021-08-01 21:51:33.414[0;39m [31mERROR[0;39m [35m17088[0;39m [2m---[0;39m [2m[           main][0;39m [36mo.apache.catalina.core.StandardContext  [0;39m [2m:[0;39m One or more Filters failed to start. Full details will be found in the appropriate container log file
[2m2021-08-01 21:51:33.414[0;39m [31mERROR[0;39m [35m17088[0;39m [2m---[0;39m [2m[           main][0;39m [36mo.apache.catalina.core.StandardContext  [0;39m [2m:[0;39m Context [] startup failed due to previous errors
[2m2021-08-01 21:51:33.419[0;39m [33m WARN[0;39m [35m17088[0;39m [2m---[0;39m [2m[           main][0;39m [36mo.a.c.loader.WebappClassLoaderBase      [0;39m [2m:[0;39m The web application [ROOT] appears to have started a thread named [spring.cloud.inetutils] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.base@16.0.1/jdk.internal.misc.Unsafe.park(Native Method)
 java.base@16.0.1/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
 java.base@16.0.1/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:505)
 java.base@16.0.1/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3137)
 java.base@16.0.1/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1614)
 java.base@16.0.1/java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
 java.base@16.0.1/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1056)
 java.base@16.0.1/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1116)
 java.base@16.0.1/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
 java.base@16.0.1/java.lang.Thread.run(Thread.java:831)
[2m2021-08-01 21:51:33.496[0;39m [32m INFO[0;39m [35m17088[0;39m [2m---[0;39m [2m[           main][0;39m [36mo.apache.catalina.core.StandardService  [0;39m [2m:[0;39m Stopping service [Tomcat]
[2m2021-08-01 21:51:33.498[0;39m [33m WARN[0;39m [35m17088[0;39m [2m---[0;39m [2m[           main][0;39m [36mConfigServletWebServerApplicationContext[0;39m [2m:[0;39m Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
[2m2021-08-01 21:51:33.511[0;39m [32m INFO[0;39m [35m17088[0;39m [2m---[0;39m [2m[           main][0;39m [36mConditionEvaluationReportLoggingListener[0;39m [2m:[0;39m 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
[2m2021-08-01 21:51:33.513[0;39m [31mERROR[0;39m [35m17088[0;39m [2m---[0;39m [2m[           main][0;39m [36mo.s.boot.SpringApplication              [0;39m [2m:[0;39m Application run failed

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:156) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at eureka_server.EurekaServerApplication.main(EurekaServerApplication.java:11) ~[classes/:na]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:126) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:88) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:438) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	... 8 common frames omitted
Caused by: java.lang.IllegalStateException: StandardEngine[Tomcat].StandardHost[localhost].TomcatEmbeddedContext[] failed to start
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.rethrowDeferredStartupExceptions(TomcatWebServer.java:171) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:110) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
	... 13 common frames omitted

从网上其他的文章分析来看-开始分析是由于相同一个maven repository造成的冲突，于是重新新建了一个repository 改了setting.xml配置，重新maven，启动还是报一样的错，仔细分析后，看到jre编译环境有所不同，开始下载sts之后一直没有改变过环境也是采用默认的jre

后面换成本地jdk1.8.0_251之后启动正常，打开eureka管理中心也是可以打开
此文章不一定适用所有人，但也为此问题提供了一个解决方法，如有瑕疵，往请见谅

以上就是解决“Unable to start embedded Tomcat“错误的完整指南的详细内容，更多关于Unable to start embedded Tomcat的资料请关注脚本之家其它相关文章！

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