Question

Given three POM files:

• C depends on B.
• B inherits from A.
• I can build A and B
• C fails to build because of its dependency on B.

The full source-code and build output is included below for your review.

Here is A’s POM:

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.foo</groupId>
    <artifactId>A</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>A</name>
    <repositories>
        <repository>
            <id>foo releases</id>
            <name>libs-releases-local</name>
            <layout>default</layout>
            <url>http://foo.net/artifactory/libs-releases-local</url>
        </repository>
    </repositories>
    <dependencies>
        <dependency>
            <groupId>org.eclipse.swt</groupId>
            <artifactId>swt</artifactId>
            <classifier>${swt.classifier}</classifier>
            <version>3.6.1</version>
        </dependency>
    </dependencies>
    <profiles>
        <profile>
            <id>windows-x86</id>
            <properties>
                <swt.classifier>win32-x86</swt.classifier>
            </properties>
        </profile>
    </profiles>
</project>

Here is B’s POM:

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.foo</groupId>
        <artifactId>A</artifactId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../A</relativePath>
    </parent>
    <artifactId>B</artifactId>
    <packaging>jar</packaging>
    <name>B</name>
    <profiles>
        <profile>
            <id>windows-x86</id>
            <properties>
                <swt.classifier>win32-x86</swt.classifier>
            </properties>
        </profile>
    </profiles>
</project>

Here is C’s POM:

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.foo</groupId>
    <artifactId>C</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>C</name>
    <dependencies>
        <dependency>
            <groupId>${project.groupId}</groupId>
            <artifactId>B</artifactId>
            <version>${project.version}</version>
        </dependency>
    </dependencies>
</project>

Here is the build output from C:

------------------------------------------------------------------------
Building C
   task-segment: [install]
------------------------------------------------------------------------
[compiler:compile]
Nothing to compile - all classes are up to date
Downloading: http://foo.net/artifactory/libs-releases-local/org/eclipse/swt/swt/3.6.1/swt-3.6.1-${swt.classifier}.jar
[WARNING] Unable to get resource 'org.eclipse.swt:swt:jar:${swt.classifier}:3.6.1' from repository foo releases (http://foo.net/artifactory/libs-releases-local): Error transferring file: foo.net
Downloading: http://repo1.maven.org/maven2/org/eclipse/swt/swt/3.6.1/swt-3.6.1-${swt.classifier}.jar
Unable to find resource 'org.eclipse.swt:swt:jar:${swt.classifier}:3.6.1' in repository central (http://repo1.maven.org/maven2)
------------------------------------------------------------------------
[ERROR]BUILD ERROR
------------------------------------------------------------------------
Failed to resolve artifact.

Missing:
----------
1) org.eclipse.swt:swt:jar:${swt.classifier}:3.6.1

I know this issue is related to https://issues.apache.org/jira/browse/MNG-3228 but I’m not sure how to fix it. Please help!

UPDATE:

Adding a classifier to B helped. Now C builds so long as the repository only contains B’s jar file. If I upload B’s POM file alongside the JAR in the repository, C fails with the aforementioned error (${swt.classifier} not defined). Any ideas?

Answer 1

This isn’t possible as of Maven 3.1.0. Here is the relevant feature request: https://issues.apache.org/jira/browse/MNG-1388