Description of problem:

The maven pom file installed by groovy:

/usr/share/maven-poms/JPP-groovy.pom

contains the following <dependency>

        <dependency>
            <groupId>antlr</groupId>
            <artifactId>antlr</artifactId>
            <version>2.7.7</version>
            <scope>compile</scope>
        </dependency>

However, the antlr-tool package that is providing the antlr.jar file does not provide any maven fragments and maven poms, so when this dependency is encountered, maven can't find it:

The repository system is offline but the artifact antlr:antlr:jar:2.7.7 is not available in the local repository

If the dependency is marked optional:

        <dependency>
            <groupId>antlr</groupId>
            <artifactId>antlr</artifactId>
            <version>2.7.7</version>
            <scope>compile</scope>
            <optional>true</optional>
        </dependency>

(like the other ant dependencies) it works again.

For a failed build in koji see this scratch rebuild of maven-invoker-plugin:
https://koji.fedoraproject.org/koji/taskinfo?taskID=4724816

This package built fine a month ago:
https://koji.fedoraproject.org/koji/buildinfo?buildID=361880

so some recent changes have made maven more picky about missing dependencies to trigger this issue.

Version-Release number of selected component (if applicable):
groovy-1.8.7-1.fc18

How reproducible:
Always

Steps to Reproduce:
Build a package that depends on groovy using maven (e.g. maven-invoker-plugin)

Actual results:
Failed build

Expected results:
Successful build