Spring Boot 应用程序在尝试运行时引发启动失败错误

Question

我正在尝试运行此处提供的示例 Spring Boot 应用程序： https : //spring.io/guides/gs/rest-service/

我希望将其构建为战争，然后应使用 tomcat 自动部署到本地主机。 我以前做过一次，但我不确定为什么它现在不起作用。 这是错误：

"C:\Program Files\Java\jdk1.8.0_111\bin\java" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=62537 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2017.1.3\lib\idea_rt.jar=62538:C:\Program Files\JetBrains\IntelliJ IDEA 2017.1.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_111\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\rt.jar;C:\Users\Jack\springtomcat\target\classes;C:\Users\Jack\.m2\repository\org\springframework\boot\spring-boot-starter-web\1.5.8.RELEASE\spring-boot-starter-web-1.5.8.RELEASE.jar;C:\Users\Jack\.m2\repository\org\springframework\boot\spring-boot-starter\1.5.8.RELEASE\spring-boot-starter-1.5.8.RELEASE.jar;C:\Users\Jack\.m2\repository\org\springframework\boot\spring-boot\1.5.8.RELEASE\spring-boot-1.5.8.RELEASE.jar;C:\Users\Jack\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\1.5.8.RELEASE\spring-boot-autoconfigure-1.5.8.RELEASE.jar;C:\Users\Jack\.m2\repository\org\springframework\boot\spring-boot-starter-logging\1.5.8.RELEASE\spring-boot-starter-logging-1.5.8.RELEASE.jar;C:\Users\Jack\.m2\repository\ch\qos\logback\logback-classic\1.1.11\logback-classic-1.1.11.jar;C:\Users\Jack\.m2\repository\ch\qos\logback\logback-core\1.1.11\logback-core-1.1.11.jar;C:\Users\Jack\.m2\repository\org\slf4j\jcl-over-slf4j\1.7.25\jcl-over-slf4j-1.7.25.jar;C:\Users\Jack\.m2\repository\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;C:\Users\Jack\.m2\repository\org\slf4j\log4j-over-slf4j\1.7.25\log4j-over-slf4j-1.7.25.jar;C:\Users\Jack\.m2\repository\org\springframework\spring-core\4.3.12.RELEASE\spring-core-4.3.12.RELEASE.jar;C:\Users\Jack\.m2\repository\org\yaml\snakeyaml\1.17\snakeyaml-1.17.jar;C:\Users\Jack\.m2\repository\org\hibernate\hibernate-validator\5.3.5.Final\hibernate-validator-5.3.5.Final.jar;C:\Users\Jack\.m2\repository\javax\validation\validation-api\1.1.0.Final\validation-api-1.1.0.Final.jar;C:\Users\Jack\.m2\repository\org\jboss\logging\jboss-logging\3.3.1.Final\jboss-logging-3.3.1.Final.jar;C:\Users\Jack\.m2\repository\com\fasterxml\classmate\1.3.4\classmate-1.3.4.jar;C:\Users\Jack\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.8.10\jackson-databind-2.8.10.jar;C:\Users\Jack\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.8.0\jackson-annotations-2.8.0.jar;C:\Users\Jack\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.8.10\jackson-core-2.8.10.jar;C:\Users\Jack\.m2\repository\org\springframework\spring-web\4.3.12.RELEASE\spring-web-4.3.12.RELEASE.jar;C:\Users\Jack\.m2\repository\org\springframework\spring-aop\4.3.12.RELEASE\spring-aop-4.3.12.RELEASE.jar;C:\Users\Jack\.m2\repository\org\springframework\spring-beans\4.3.12.RELEASE\spring-beans-4.3.12.RELEASE.jar;C:\Users\Jack\.m2\repository\org\springframework\spring-context\4.3.12.RELEASE\spring-context-4.3.12.RELEASE.jar;C:\Users\Jack\.m2\repository\org\springframework\spring-webmvc\4.3.12.RELEASE\spring-webmvc-4.3.12.RELEASE.jar;C:\Users\Jack\.m2\repository\org\springframework\spring-expression\4.3.12.RELEASE\spring-expression-4.3.12.RELEASE.jar;C:\Users\Jack\.m2\repository\org\springframework\boot\spring-boot-starter-thymeleaf\1.5.8.RELEASE\spring-boot-starter-thymeleaf-1.5.8.RELEASE.jar;C:\Users\Jack\.m2\repository\org\thymeleaf\thymeleaf-spring4\2.1.5.RELEASE\thymeleaf-spring4-2.1.5.RELEASE.jar;C:\Users\Jack\.m2\repository\org\thymeleaf\thymeleaf\2.1.5.RELEASE\thymeleaf-2.1.5.RELEASE.jar;C:\Users\Jack\.m2\repository\ognl\ognl\3.0.8\ognl-3.0.8.jar;C:\Users\Jack\.m2\repository\org\javassist\javassist\3.21.0-GA\javassist-3.21.0-GA.jar;C:\Users\Jack\.m2\repository\org\unbescape\unbescape\1.1.0.RELEASE\unbescape-1.1.0.RELEASE.jar;C:\Users\Jack\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\Jack\.m2\repository\nz\net\ultraq\thymeleaf\thymeleaf-layout-dialect\1.4.0\thymeleaf-layout-dialect-1.4.0.jar;C:\Users\Jack\.m2\repository\org\codehaus\groovy\groovy\2.4.12\groovy-2.4.12.jar" com.test.Server.Application

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.8.RELEASE)

2017-10-18 17:33:07.775  INFO 3076 --- [           main] com.test.Server.Application              : Starting Application on DESKTOP-S193TQ4 with PID 3076 (C:\Users\Jack\springtomcat\target\classes started by Jack in C:\Users\Jack\springtomcat)
2017-10-18 17:33:07.777  INFO 3076 --- [           main] com.test.Server.Application              : No active profile set, falling back to default profiles: default
2017-10-18 17:33:07.927  INFO 3076 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@4b9e255: startup date [Wed Oct 18 17:33:07 PDT 2017]; root of context hierarchy
2017-10-18 17:33:07.993  WARN 3076 --- [           main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [com.test.Server.Application]; nested exception is java.lang.IllegalStateException: Failed to introspect annotated methods on class org.springframework.boot.web.support.SpringBootServletInitializer
2017-10-18 17:33:07.998 ERROR 3076 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Destroy method on bean with name 'org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory' threw an exception

java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.context.annotation.AnnotationConfigApplicationContext@4b9e255: startup date [Wed Oct 18 17:33:07 PDT 2017]; root of context hierarchy
    at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:414) [spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253) ~[spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:961) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.destroySingletons(FactoryBeanRegistrySupport.java:230) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:968) [spring-beans-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1030) [spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:556) [spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at com.test.Server.Application.main(Application.java:16) [classes/:na]

2017-10-18 17:33:08.005 ERROR 3076 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [com.test.Server.Application]; nested exception is java.lang.IllegalStateException: Failed to introspect annotated methods on class org.springframework.boot.web.support.SpringBootServletInitializer
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:181) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:308) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:228) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:272) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:92) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
    at com.test.Server.Application.main(Application.java:16) [classes/:na]
Caused by: java.lang.IllegalStateException: Failed to introspect annotated methods on class org.springframework.boot.web.support.SpringBootServletInitializer
    at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java:163) ~[spring-core-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.retrieveBeanMethodMetadata(ConfigurationClassParser.java:380) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:314) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:245) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:198) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:167) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    ... 12 common frames omitted
Caused by: java.lang.NoClassDefFoundError: javax/servlet/ServletContext
    at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_111]
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_111]
    at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_111]
    at org.springframework.core.type.StandardAnnotationMetadata.getAnnotatedMethods(StandardAnnotationMetadata.java:152) ~[spring-core-4.3.12.RELEASE.jar:4.3.12.RELEASE]
    ... 17 common frames omitted
Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletContext
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_111]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_111]
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[na:1.8.0_111]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_111]
    ... 21 common frames omitted


Process finished with exit code 1

以下是教程提供的简单类的代码：

问候控制器.java

package com.test.Components;

import java.util.concurrent.atomic.AtomicLong;

import com.test.Models.Greeting;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GreetingController {
    private static final String template = "Hello, %s!";
    private final AtomicLong counter = new AtomicLong();

    @RequestMapping("/greeting")
    public Greeting greeting(@RequestParam(value="name", defaultValue="World") String name) {
        return new Greeting(counter.incrementAndGet(),
                            String.format(template, name));
    }
}

问候语.java

package com.test.Models;

public class Greeting {

    private final long id;
    private final String content;

    public Greeting(long id, String content) {
        this.id = id;
        this.content = content;
    }

    public long getId() {
        return id;
    }

    public String getContent() {
        return content;
    }
}

我已经修改了主类，如下所示：

package com.test.Server;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;

@SpringBootApplication
public class Application extends SpringBootServletInitializer{
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Application.class, args);
    }
}

我的项目结构如下所示：

这是我的 Maven 文件：

    <?xml version="1.0" encoding="UTF-8"?>
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.test</groupId>
    <artifactId>springtomcat</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>war</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
    </parent>

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

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

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

我真的不知道为什么它不起作用。 我包含了构建战争和使用 tomcat 的必要依赖项，并且每次运行时我都会为 maven 进行清理和安装。 我的战争也正确输出到目标文件夹。 我的配置看起来像这样：

我已经尝试弄乱包结构并使用 scanBasePackages，但没有任何改变错误。

任何帮助是极大的赞赏。

Answer 1

解决方案在此处提供https://stackoverflow.com/a/45263216/1937953

TLDR 从 pom.xml 文件中spring-boot-starter-tomcat的依赖中移除<scope>provided</scope>

Answer 2

我认为这里有一个误解，在 Spring Boot 中，我们不需要创建战争来部署在 tomcat 服务器中。 使用 spring boot 的好处是它添加了所有必需的依赖项。 所以你只需要开发应用程序

以下是您可以尝试使其工作的以下步骤。

1. 如果您希望您的项目创建一个 war 文件并将其部署在外部服务器中，您需要将 spring boot 中的 tomcat 依赖项的范围设置为“提供”。

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

2. 如果您希望在运行 Spring Boot 应用程序后自动部署您的应用程序，请将范围设置为“编译”。

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

Answer 3

回答我自己的问题：

我没有完整的解决方案。 我遇到了@Olantobi 在我帖子的评论中指出的同样问题。 首先，我需要将它添加到我的主类 Application.java 以使其与我的配置一起工作：

@SpringBootApplication(scanBasePackages = "com.test")

这看起来像一个例子：

我需要做的另一件事是让它运行并部署到本地主机：

这现在有效。 我不确定是否需要做任何特别的事情才能让它在 AWS 弹性 beantalk 服务器上运行，但如果需要，我可能会在这里发表评论。

Answer 4

因为当您将spring-boot-starter-web到 pom 文件时，Spring Boot 会自动添加嵌入式 Tomcat 依赖项作为默认选项。 您可以直接将应用程序作为独立的 Web 应用程序运行。

正如我在您的问题下的评论中所说，如果要将 WAR 文件部署到任何 Servlet 3 容器，则需要在spring-boot-starter-web排除spring-boot-starter-tomcat的依赖项。

敌例：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>

Answer 5

删除范围：

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

或替换为编译：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>compile</scope>
</dependency>

Answer 6

添加这个解决了我的问题

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-tomcat</artifactId>
    <version>2.4.5</version>
</dependency>

Answer 7

我通过以下方式解决了这个问题：

1 编辑 pom.xml 更改范围提供程序 -> 编译

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

2 右键项目 -> Maven -> 重新加载项目

3 运行应用程序