使用 spring boot 2.6.2 及以上版本时 Spring Boot Embedded Tomcat 无法启动

Question

我基于spring boot 2.6.2启动了一个新的spring boot应用。该应用程序非常简单，只是带有 web-mvc 和 spring-security 的 helloworld。我之前做过几次，但是这次应用程序运行时tomcat没有启动。 pom.xml 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>2.6.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.demo</groupId>
    <artifactId>spring-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-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>

应用启动时控制台如下：

"C:\Program Files\Java\jdk1.8.0_301\bin\java.exe" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\lib\idea_rt.jar=12156:C:\Program Files\JetBrains\IntelliJ IDEA 2020.3.2\bin" -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_301\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_301\jre\lib\rt.jar;E:\code\example\java\spring-demo\target\classes;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-security\2.6.3\spring-boot-starter-security-2.6.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter\2.6.3\spring-boot-starter-2.6.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot\2.6.3\spring-boot-2.6.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.6.3\spring-boot-autoconfigure-2.6.3.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.6.3\spring-boot-starter-logging-2.6.3.jar;C:\Users\Administrator\.m2\repository\ch\qos\logback\logback-classic\1.2.10\logback-classic-1.2.10.jar;C:\Users\Administrator\.m2\repository\ch\qos\logback\logback-core\1.2.10\logback-core-1.2.10.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.17.1\log4j-to-slf4j-2.17.1.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-api\2.17.1\log4j-api-2.17.1.jar;C:\Users\Administrator\.m2\repository\org\slf4j\jul-to-slf4j\1.7.33\jul-to-slf4j-1.7.33.jar;C:\Users\Administrator\.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\Administrator\.m2\repository\org\yaml\snakeyaml\1.29\snakeyaml-1.29.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-aop\5.3.15\spring-aop-5.3.15.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-beans\5.3.15\spring-beans-5.3.15.jar;C:\Users\Administrator\.m2\repository\org\springframework\security\spring-security-config\5.6.1\spring-security-config-5.6.1.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-context\5.3.15\spring-context-5.3.15.jar;C:\Users\Administrator\.m2\repository\org\springframework\security\spring-security-web\5.6.1\spring-security-web-5.6.1.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-expression\5.3.15\spring-expression-5.3.15.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.6.3\spring-boot-starter-json-2.6.3.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.13.1\jackson-databind-2.13.1.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.13.1\jackson-annotations-2.13.1.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.13.1\jackson-core-2.13.1.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.13.1\jackson-datatype-jdk8-2.13.1.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.13.1\jackson-datatype-jsr310-2.13.1.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.13.1\jackson-module-parameter-names-2.13.1.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-web\5.3.15\spring-web-5.3.15.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-webmvc\5.3.15\spring-webmvc-5.3.15.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.33\slf4j-api-1.7.33.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-core\5.3.15\spring-core-5.3.15.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-jcl\5.3.15\spring-jcl-5.3.15.jar;C:\Users\Administrator\.m2\repository\org\springframework\security\spring-security-core\5.6.1\spring-security-core-5.6.1.jar;C:\Users\Administrator\.m2\repository\org\springframework\security\spring-security-crypto\5.6.1\spring-security-crypto-5.6.1.jar" com.demo.springdemo.SpringDemoApplication

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.6.3)

2022-01-22 23:39:59.885  INFO 47256 --- [           main] c.c.springdemo.SpringDemoApplication     : Starting SpringDemoApplication using Java 1.8.0_301 on 5YUOP71L7Z3I7K5 with PID 47256 (E:\code\example\java\spring-demo\target\classes started by Administrator in E:\code\example\java\spring-demo)
2022-01-22 23:39:59.887  INFO 47256 --- [           main] c.c.springdemo.SpringDemoApplication     : No active profile set, falling back to default profiles: default
2022-01-22 23:40:00.295  INFO 47256 --- [           main] c.c.springdemo.SpringDemoApplication     : Started SpringDemoApplication in 0.642 seconds (JVM running for 1.088)

Process finished with exit code 0

我确定这个问题与 Spring Boot 2.6.2 版本有关。因为当我将版本更改为 2.6.1 及以下时，一切正常。 2.6.3 版也不起作用。这真是一个意想不到的陷阱。有谁知道吗？

ps：代码如下：

package com.demo.springdemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@SpringBootApplication
public class SpringDemoApplication {

    @GetMapping("/")
    public String hello() {
        return "hello";
    }
    public static void main(String[] args) {

        SpringApplication.run(SpringDemoApplication.class, args);

    }

}

Answer 1

请在添加此依赖后尝试：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <scope>provided</scope>
</dependency>