Maven package jar multi-module project

Question

I have multi module project. I want to make an executable jar from one of this modules. root pom is

    <groupId>ru.netCracker</groupId>
    <artifactId>root</artifactId>
    <!--todo:Version-->
    <version>1.1.0</version>
    <packaging>pom</packaging>

    <properties>...</properties>

    <modules>
        <module>client</module>
        <module>serverRoot</module>
    </modules>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>${maven.compiler.version}</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin> 
        </plugins>
    </build>
</project>

In child pom is specified jar packaging settings and some dependencies.

    <artifactId>client</artifactId>
    <!--todo:Version-->
    <version>1.1.0</version>

    <parent>
        <groupId>ru.netCracker</groupId>
        <artifactId>root</artifactId>
        <version>1.1.0</version>
    </parent>

    <properties>
        <maven.jar.version>3.0.2</maven.jar.version>
        <jfoenix.version>1.11.1</jfoenix.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>ru.netCracker</groupId>
            <artifactId>root</artifactId>
            <version>1.1.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>${maven.jar.version}</version>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>lib/</classpathPrefix>
                            <mainClass>sample.Main</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

But maven compiler says:

[ERROR] Failed to execute goal on project client: Could not resolve dependencies for project ru.netCracker:client:jar:1.1.0: Failure to find ru.netCracker:root:jar:1.1.0 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]

What commands have I to write to maven to package this jar?

Answer 1

Maven is simply complaining that it can't find the dependency for root module as it hasn't been built yet.

I suggest to make following changes -

1. Change your parent tag in client module to

   <parent>
       <groupId>ru.netCracker</groupId>
       <artifactId>root</artifactId>
       <version>1.1.0</version>
       <relativePath>../</relativePath>
   </parent>
   

2. Remove following code since you have root as your parent.

   <dependencies>
       <dependency>
           <groupId>ru.netCracker</groupId>
           <artifactId>root</artifactId>
           <version>1.1.0</version>
       </dependency>
   </dependencies>