spring-boot - 为什么 spring-boot-starter-webflux 会导入 spring-web？
问题描述
在我的pom.xml我替换了这个依赖：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
经过
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
但是，我的 Spring Boot 应用程序仍然作为传统的“Web”应用程序运行，并且反应部分不起作用（例如org.springframework.web.server.WebFilter，从不调用实现类）。
我像这样运行应用程序：
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
这个答案https://stackoverflow.com/a/51378560说您可以通过执行以下操作强制您的 Spring Boot 应用程序作为 Reactive 运行：
SpringApplication.setWebApplicationType(WebApplicationType.REACTIVE)
不幸的是，该setWebApplicationType()方法不是静态的。
所以我浏览了 Spring Boot 代码，发现webApplicationType是通过调用 enum 中的方法来确定的org.springframework.boot.WebApplicationType。
就我而言，该static WebApplicationType deduceFromClasspath()方法继续存在，return WebApplicationType.SERVLET;因为在该方法的第一次测试中：
if (ClassUtils.isPresent(WEBFLUX_INDICATOR_CLASS, null) && !ClassUtils.isPresent(WEBMVC_INDICATOR_CLASS, null)
&& !ClassUtils.isPresent(JERSEY_INDICATOR_CLASS, null))
ClassUtils.isPresent(WEBMVC_INDICATOR_CLASS, null)评估true使整个谓词失败的结果。
所以我想知道，为什么WEBMVC_INDICATOR_CLASS(value = org.springframework.web.servlet.DispatcherServlet) 仍然存在？？？好吧，mvn dependency:tree给我答案：
[INFO] +- org.springframework.boot:spring-boot-starter-webflux:jar:2.1.8.RELEASE:compile
[INFO] | +- org.springframework:spring-web:jar:5.1.9.RELEASE:compile
[INFO] | \- org.springframework:spring-webflux:jar:5.1.9.RELEA4SE:compile
spring-boot-starter-webflux依赖项实际上都导入了！！！
那我该怎么办？！！排除spring-web?
编辑：根据要求，添加完整（编辑）pom.xml：
<?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.company</groupId>
<artifactId>whatever-backend-api</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<name>Whatever API</name>
<description>API for whatever project</description>
<url>https://api.company.com/</url>
<organization>
<name>Company</name>
<url>http://www.company.com/</url>
</organization>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.8.RELEASE</version>
</parent>
<properties>
<java.version>1.8</java.version>
<kotlin.version>1.3.10</kotlin.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<project.scm.id>gitRepo</project.scm.id>
<spring-cloud.version>Greenwich.SR3</spring-cloud.version>
<springfox.version>2.9.2</springfox.version>
<graphql-spring-boot-starter.version>5.10.0</graphql-spring-boot-starter.version>
</properties>
<distributionManagement>
<repository>
<id>releasesRepo</id>
<url>https://nexus.company.com/repository/maven-releases/</url>
</repository>
<snapshotRepository>
<uniqueVersion>false</uniqueVersion>
<id>snapshotsRepo</id>
<url>https://nexus.company.com/repository/maven-snapshots/</url>
</snapshotRepository>
</distributionManagement>
<scm>
<developerConnection>scm:git:https://gitlab.company.com/root/dev/whatever/whatever-backend-api.git</developerConnection>
<tag>HEAD</tag>
</scm>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-commons</artifactId>
</dependency>
<dependency>
<groupId>com.kastkode</groupId>
<artifactId>springsandwich</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.graphql-java-kickstart</groupId>
<artifactId>graphql-spring-boot-starter</artifactId>
<version>${graphql-spring-boot-starter.version}</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>${springfox.version}</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>${springfox.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>4.4</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.graphql-java-kickstart</groupId>
<artifactId>graphql-spring-boot-starter-test</artifactId>
<version>${graphql-spring-boot-starter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<finalName>whatever-api</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>build-info</goal>
</goals>
<configuration>
<additionalProperties>
<java.source>${java.version}</java.source>
<encoding.source>${project.build.sourceEncoding}</encoding.source>
<encoding.reporting>${project.reporting.outputEncoding}</encoding.reporting>
</additionalProperties>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.4</version>
<configuration>
<excludes>
<exclude>*MethodAccess</exclude>
</excludes>
</configuration>
<executions>
<execution>
<id>prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-release-plugin</artifactId>
<configuration>
<tagNameFormat>@{project.version}</tagNameFormat>
</configuration>
</plugin>
</plugins>
</build>
</project>
解决方案
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