环境：

 <spring-boot-version>2.3.5.RELEASE</spring-boot-version>
  <spring-cloud-version>Hoxton.SR8</spring-cloud-version>

错误log

Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-03-15 21:56:29.508 ERROR 18232 --- [ main] o.s.boot.SpringApplication : 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:161) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545) ~[spring-context-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at com.imooc.registry.RegistryApp.main(RegistryApp.java:16) ~[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:142) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:440) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:193) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:178) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:158) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
... 9 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:187) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:126) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
... 14 common frames omitted

原因：spring cloud版本有问题，更换为一下版本即可

<spring-cloud-version>Hoxton.SR12</spring-cloud-version>

Spring 官方对应版本地址： (https://start.spring.io/actuator/info)

{
    "git": {
        "branch": "7857199786b4ffba883304a75dfbaac342ffaa51",
        "commit": {
            "id": "7857199",
            "time": "2022-03-15T07:59:46Z"
        }
    },
    "build": {
        "version": "0.0.1-SNAPSHOT",
        "artifact": "start-site",
        "versions": {
            "spring-boot": "2.6.4",
            "initializr": "0.13.0-SNAPSHOT"
        },
        "name": "start.spring.io website",
        "time": "2022-03-15T08:01:37.995Z",
        "group": "io.spring.start"
    },
    "bom-ranges": {
        "azure": {
            "3.2.0": "Spring Boot >=2.3.0.M1 and <2.4.0-M1",
            "3.5.0": "Spring Boot >=2.4.0.M1 and <2.5.0-M1",
            "3.14.0": "Spring Boot >=2.5.0.M1 and <2.7.0-M1"
        },
        "codecentric-spring-boot-admin": {
            "2.4.3": "Spring Boot >=2.3.0.M1 and <2.5.0-M1",
            "2.5.5": "Spring Boot >=2.5.0.M1 and <2.6.0-M1",
            "2.6.2": "Spring Boot >=2.6.0.M1 and <2.7.0-M1"
        },
        "solace-spring-boot": {
            "1.1.0": "Spring Boot >=2.3.0.M1 and <2.6.0-M1"
        },
        "solace-spring-cloud": {
            "1.1.1": "Spring Boot >=2.3.0.M1 and <2.4.0-M1",
            "2.1.0": "Spring Boot >=2.4.0.M1 and <2.6.0-M1"
        },
        "spring-cloud": {
            "Hoxton.SR12": "Spring Boot >=2.2.0.RELEASE and <2.4.0.M1",
            "2020.0.5": "Spring Boot >=2.4.0.M1 and <2.6.0-M1",
            "2021.0.0-M1": "Spring Boot >=2.6.0-M1 and <2.6.0-M3",
            "2021.0.0-M3": "Spring Boot >=2.6.0-M3 and <2.6.0-RC1",
            "2021.0.0-RC1": "Spring Boot >=2.6.0-RC1 and <2.6.1",
            "2021.0.1": "Spring Boot >=2.6.1 and <2.6.5-SNAPSHOT",
            "2021.0.2-SNAPSHOT": "Spring Boot >=2.6.5-SNAPSHOT and <3.0.0-M1",
            "2022.0.0-M1": "Spring Boot >=3.0.0-M1 and <3.1.0-M1"
        },
        "spring-cloud-gcp": {
            "2.0.8": "Spring Boot >=2.4.0-M1 and <2.6.0-M1",
            "3.1.0": "Spring Boot >=2.6.0-M1 and <2.7.0-M1"
        },
        "spring-cloud-services": {
            "2.3.0.RELEASE": "Spring Boot >=2.3.0.RELEASE and <2.4.0-M1",
            "2.4.1": "Spring Boot >=2.4.0-M1 and <2.5.0-M1",
            "3.3.0": "Spring Boot >=2.5.0-M1 and <2.6.0-M1",
            "3.4.0": "Spring Boot >=2.6.0-M1 and <2.7.0-M1"
        },
        "spring-geode": {
            "1.3.12.RELEASE": "Spring Boot >=2.3.0.M1 and <2.4.0-M1",
            "1.4.13": "Spring Boot >=2.4.0-M1 and <2.5.0-M1",
            "1.5.10": "Spring Boot >=2.5.0-M1 and <2.6.0-M1",
            "1.6.4": "Spring Boot >=2.6.0-M1 and <2.7.0-M1",
            "1.7.0-M2": "Spring Boot >=2.7.0-M1 and <3.0.0-M1",
            "2.0.0-M1": "Spring Boot >=3.0.0-M1 and <3.1.0-M1"
        },
        "vaadin": {
            "14.8.5": "Spring Boot >=2.1.0.RELEASE and <2.6.0-M1",
            "23.0.1": "Spring Boot >=2.6.0-M1 and <2.8.0-M1"
        },
        "wavefront": {
            "2.0.2": "Spring Boot >=2.1.0.RELEASE and <2.4.0-M1",
            "2.1.1": "Spring Boot >=2.4.0-M1 and <2.5.0-M1",
            "2.2.2": "Spring Boot >=2.5.0-M1 and <2.7.0-M1"
        }
    },
    "dependency-ranges": {
        "native": {
            "0.9.0": "Spring Boot >=2.4.3 and <2.4.4",
            "0.9.1": "Spring Boot >=2.4.4 and <2.4.5",
            "0.9.2": "Spring Boot >=2.4.5 and <2.5.0-M1",
            "0.10.0": "Spring Boot >=2.5.0-M1 and <2.5.2",
            "0.10.1": "Spring Boot >=2.5.2 and <2.5.3",
            "0.10.2": "Spring Boot >=2.5.3 and <2.5.4",
            "0.10.3": "Spring Boot >=2.5.4 and <2.5.5",
            "0.10.4": "Spring Boot >=2.5.5 and <2.5.6",
            "0.10.5": "Spring Boot >=2.5.6 and <2.5.9",
            "0.10.6": "Spring Boot >=2.5.9 and <2.6.0-M1",
            "0.11.0-M1": "Spring Boot >=2.6.0-M1 and <2.6.0-RC1",
            "0.11.0-M2": "Spring Boot >=2.6.0-RC1 and <2.6.0",
            "0.11.0-RC1": "Spring Boot >=2.6.0 and <2.6.1",
            "0.11.0": "Spring Boot >=2.6.1 and <2.6.2",
            "0.11.1": "Spring Boot >=2.6.2 and <2.6.3",
            "0.11.2": "Spring Boot >=2.6.3 and <2.6.4",
            "0.11.3": "Spring Boot >=2.6.4 and <2.6.5-SNAPSHOT",
            "0.11.4-SNAPSHOT": "Spring Boot >=2.6.5-SNAPSHOT and <2.7.0-M1"
        },
        "okta": {
            "1.4.0": "Spring Boot >=2.2.0.RELEASE and <2.4.0-M1",
            "1.5.1": "Spring Boot >=2.4.0-M1 and <2.4.1",
            "2.0.1": "Spring Boot >=2.4.1 and <2.5.0-M1",
            "2.1.5": "Spring Boot >=2.5.0-M1 and <2.7.0-M1"
        },
        "mybatis": {
            "2.1.4": "Spring Boot >=2.1.0.RELEASE and <2.5.0-M1",
            "2.2.2": "Spring Boot >=2.5.0-M1"
        },
        "camel": {
            "3.5.0": "Spring Boot >=2.3.0.M1 and <2.4.0-M1",
            "3.10.0": "Spring Boot >=2.4.0.M1 and <2.5.0-M1",
            "3.13.0": "Spring Boot >=2.5.0.M1 and <2.6.0-M1",
            "3.15.0": "Spring Boot >=2.6.0.M1 and <2.7.0-M1"
        },
        "picocli": {
            "4.6.3": "Spring Boot >=2.4.0.RELEASE and <3.0.0-M1"
        },
        "open-service-broker": {
            "3.2.0": "Spring Boot >=2.3.0.M1 and <2.4.0-M1",
            "3.3.1": "Spring Boot >=2.4.0-M1 and <2.5.0-M1",
            "3.4.0-M2": "Spring Boot >=2.5.0-M1 and <2.6.0-M1"
        }
    }
}

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