spring-boot:run in a Maven Multi-Module Project without mvn install

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I have a Maven multi-module project with the following structure (the code is posted below):

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

spring-altroot-reactor-web is a Spring web application depending on spring-altroot-reactor-lib. My goal is to run the Spring app without installing the artifacts into the local M2 repository.

After installing the modules with mvn install I can go to the spring-altroot-reactor-web directory and start the application via mvn spring-boot:run. This works as expected.

However, when I try to run spring-altroot-reactor-web without calling mvn install, I run into the following two errors:

  • Calling mvn spring-boot:run -pl :spring-altroot-reactor-web -am in directory spring-altroot-reactor produces the following output:

     [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]

    Enabling the spring-boot-maven-plugin in spring-altroot-reactor does not work either:

     [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 tries to execute the parent pom instead of the web project.

  • Executing mvn spring-boot:run within the spring-altroot-reactor-web directory fails to find the dependency spring-altroot-reactor-lib because it is not installed:

     [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).

Is it possible at all to execute the Spring plugin and find the spring-altroot-reactor-lib dependency without installation to the local M2?

Other Maven plugins can do this, for example I have done it with the Jetty Maven plugin like so: mvn jetty:run -pl :my-web-project -am called from the root pom starts Jetty successfully.

A small footnote: I do not inherit from the Spring Boot parent pom but add it as a dependency. I am not sure if this is relevant to the issue.

The code follows.

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>

EDIT: A solution was found thanks to bekce's comment below. This issue is a duplicate of Run mvn spring-boot:run from parent module? The proposed solution there works for me.

spring-boot maven spring java
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