Maven multilevel dependencies on other local projects

Question

I have 3 projects in the same directory. Project 1 can run on its own. Project 2 requires project 1. Project 3 requires project 2 and project 1.

I do not wish to upload the projects to a remote depository. So

Project 1 should build as normal. It should not know about other users of it or contain information about their builds.

Project 2 would require building/importing Project 1.

Project 3 would require building/importing Project 1 and 2 - or - Project 2 plus recursive dependencies.

The project 2 pom.xml looks like this:

<?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.project2</groupId>
<artifactId>project2</artifactId>
<version>1</version>
<packaging>jar</packaging>

<dependencies>
    <dependency>
        <groupId>com.project1</groupId>
        <artifactId>project1</artifactId>
        <version>1</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-install-plugin</artifactId>
            <version>2.5.1</version>
            <configuration>
                <groupId>com.project1</groupId>
                <artifactId>project1</artifactId>
                <version>1</version>
                <packaging>jar</packaging>
                <file>${project.basedir}/../project1/target/project1-1.jar</file>
                <pomFile>${project.basedir}/../project1/pom.xml</pomFile>
            </configuration>
            <executions>
                <execution>
                    <id>install-project1-jar</id>
                    <goals>
                        <goal>install-file</goal>
                    </goals>
                    <phase>validate</phase>
                </execution>
            </executions>
        </plugin>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.6.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

That works.

The project 3 pom.xml looks like this:

<?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.project3</groupId>
<artifactId>project3</artifactId>
<version>1</version>
<packaging>jar</packaging>

<dependencies>
    <dependency>
        <groupId>com.project2</groupId>
        <artifactId>project2</artifactId>
        <version>1</version>
    </dependency>
</dependencies>

<build>
<plugins>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-install-plugin</artifactId>
        <version>2.5.1</version>
        <configuration>
            <groupId>com.project2</groupId>
            <artifactId>project2</artifactId>
            <version>1</version>
            <packaging>jar</packaging>
             <file>${project.basedir}/../project2/target/project2-1.jar</file>
            <pomFile>${project.basedir}/../project2/pom.xml</pomFile>
        </configuration>
        <executions>
            <execution>
                <id>install-project2-jar</id>
                <goals>
                    <goal>install-file</goal>
                </goals>
                <phase>validate</phase>
            </execution>
        </executions>
    </plugin>

    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.6.1</version>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
        </configuration>
    </plugin>
</plugins>
</build>

That only retrieves dependencies for Project 2, the build does not find/retrieve dependencies for Project 1. It cannot find the pom.

How can I make maven find local dependencies more than one level up in the hierarchy of dependencies for the install-file plugin or for a different/better method?

Answer 1

I would suggest that you change this to be a multi module project. Your setup seems very complex.