java - spring-boot：在没有 mvn install 的 Maven 多模块项目中运行

Question

我有一个具有以下结构的 Maven 多模块项目（代码发布在下面）：

spring-altroot-reactor
  |
  +-- spring-altroot-reactor-lib
  |
  +-- spring-altroot-reactor-web

spring-altroot-reactor-web是一个 Spring Web 应用程序，依赖于spring-altroot-reactor-lib. 我的目标是在不将工件安装到本地 M2 存储库的情况下运行 Spring 应用程序。

安装模块后，mvn install我可以转到spring-altroot-reactor-web目录并通过mvn spring-boot:run. 这按预期工作。

但是，当我尝试在spring-altroot-reactor-web不调用的情况下运行时mvn install，遇到以下两个错误：

• mvn spring-boot:run -pl :spring-altroot-reactor-web -am在目录中调用spring-altroot-reactor会产生以下输出：

   [ERROR] No plugin found for prefix 'spring-boot' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local ($HOME/.m2/repository), central (https://repo.maven.apache.org/maven2)] -> [Help 1]
  

  启用spring-boot-maven-plugininspring-altroot-reactor也不起作用：

   [ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.4.5:run (default-cli) on project spring-altroot-reactor: Unable to find a suitable main class, please add a 'mainClass' property -> [Help 1]
  

  Spring 尝试执行父 pom 而不是 web 项目。

• mvn spring-boot:run在目录中执行spring-altroot-reactor-web找不到依赖spring-altroot-reactor-lib，因为没有安装：

   [ERROR] Failed to execute goal on project spring-altroot-reactor-web: Could not resolve dependencies for project com.example.spring:spring-altroot-reactor-web:war:1.0-SNAPSHOT: Could not find artifact com.example.spring:spring-altroot-reactor-lib:jar:1.0-SNAPSHOT in ... (my snapshot repo).
  

是否有可能在spring-altroot-reactor-lib不安装到本地 M2 的情况下执行 Spring 插件并找到依赖项？

其他 Maven 插件可以做到这一点，例如我已经使用 Jetty Maven 插件做到了这一点：mvn jetty:run -pl :my-web-project -am从根 pom 调用成功启动了 Jetty。

一个小脚注：我没有从 Spring Boot 父 pom 继承，而是将其添加为依赖项。我不确定这是否与问题有关。

代码如下。

spring-altroot-reactor/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">
    
    <groupId>com.example.spring</groupId>
    <artifactId>spring-altroot-reactor</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        
        <spring.boot.version>2.4.3</spring.boot.version>
        
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
        
    </properties>

    <modules>
        <module>spring-altroot-reactor-lib</module>
        <module>spring-altroot-reactor-web</module>
    </modules>

    <build>
        <pluginManagement>
            <plugins>
            
                <plugin>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>3.3.1</version>
                </plugin>
            
                <!--
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
                
                -->

            </plugins>
        </pluginManagement>
    </build>

    <modelVersion>4.0.0</modelVersion>

</project>

spring-altroot-reactor/spring-altroot-reactor-lib/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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    
    <parent>
        <groupId>com.example.spring</groupId>
        <artifactId>spring-altroot-reactor</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>spring-altroot-reactor-lib</artifactId>
    <packaging>jar</packaging>

    <modelVersion>4.0.0</modelVersion>
    
</project>

spring-altroot-reactor/spring-altroot-reactor-web/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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    
    <parent>
        <groupId>com.example.spring</groupId>
        <artifactId>spring-altroot-reactor</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>spring-altroot-reactor-web</artifactId>
    <packaging>war</packaging>

    <dependencies>
        
        <dependency>
            <groupId>${project.groupId}</groupId>
            <artifactId>spring-altroot-reactor-lib</artifactId>
            <version>${project.version}</version>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

    </dependencies>

    <dependencyManagement>

        <dependencies>

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

        </dependencies>

    </dependencyManagement>

    <build>

        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring.boot.version}</version>
                
                <configuration>
                    <systemPropertyVariables>
                        <property1>test</property1>
                        <property2>${my.value}</property2>
                    </systemPropertyVariables>
                </configuration>
                
            </plugin>
        </plugins>
    </build>
    
    <modelVersion>4.0.0</modelVersion>
    
</project>

编辑：由于bekce下面的评论找到了解决方案。 此问题与Run mvn spring-boot:run from parent module 重复？ 那里提出的解决方案对我有用。

标签： javaspringspring-bootmaven