How to Build specific module in a multi module spring-boot maven project

Question

I have create a multi module spring boot maven project.

But when I use

mvn clean package -pl module2 spring-boot:run

in console. It tell me that some class in module1 can not find.

But I have added the dependency in module2. The module2 is the final project.

the project structure is as follows.

parent project`s pom.xml

<groupId>com.example</groupId>
<artifactId>multi-module</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>

<modules>
    <module>module1</module>
    <module>module2</module>

</modules>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.2.RELEASE</version>
    <relativePath/>
</parent>

<properties>
    ...
</properties>

</dependencies>
    ...
<dependencyManagement>
    ...
</dependencyManagement>

the pom in module1:

<groupId>com.example</groupId>
<artifactId>module1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<parent>
    <groupId>com.example</groupId>
    <artifactId>multi-module</artifactId>
    <version>0.0.1-SNAPSHOT</version>
</parent>

the pom.xml in module2:

<artifactId>personalinfo</artifactId>
<name>personalinfo</name>
<url>http://maven.apache.org</url>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<parent>
    <groupId>com.example</groupId>
    <artifactId>multi-module</artifactId>
    <version>0.0.1-SNAPSHOT</version>
</parent>

<dependencies>
    <dependency>
        <groupId>com.example</groupId>
        <artifactId>module1</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>repackage</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

Answer 1

The answer from @bitscanbyte is correct, but the configuration can be simplified:

Parent pom

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <skip>true</skip>
            </configuration>
        </plugin>
    </plugins>
</build>

Module pom (the module in which the @SpringBootApplication is located)

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <skip>false</skip>
            </configuration>
        </plugin>
    </plugins>
</build>

A simple demo project can be found here: https://github.com/drahkrub/spring-boot-multi-module

Answer 2

You need to tweak your pom.

Parent pom:

   <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <skip>true</skip>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

Module pom (containing your Main)

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <mainClass>Your mainClass</mainClass>
                <fork>true</fork>
                <skip>false</skip>
            </configuration>
        </plugin>
    </plugins>
</build>

Pay emphasis on Configuration > skip