Broken on maven 3.3.1

[donald-w]

Sample plugin invocation:

        <plugin>
            <groupId>org.fortasoft</groupId>
            <artifactId>gradle-maven-plugin</artifactId>
            <version>1.0.5</version>
            <configuration>
                <tasks>
                    <!-- this would effectively call "gradle doSomething" -->
                    <task>build</task>
                </tasks>
                <gradleVersion>2.2.1</gradleVersion>
                <gradleProjectDirectory>../gradletest</gradleProjectDirectory>
            </configuration>
            <executions>
                <execution>
                    <!-- You can bind this to any phase you like -->
                    <phase>compile</phase>
                    <goals>
                        <!-- goal must be "invoke" -->
                        <goal>invoke</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

[ERROR] Failed to execute goal org.fortasoft:gradle-maven-plugin:1.0.5:invoke (default) on project gradlebridge: Execution default of goal org.fortasoft:gradle-maven-plugin:1.0.5:invoke failed: A required class was missing while executing org.fortasoft:gradle-maven-plugin:1.0.5:invoke: org/slf4j/impl/NewMojoLogger
[ERROR] -----------------------------------------------------
[ERROR] realm = plugin>org.fortasoft:gradle-maven-plugin:1.0.5
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/Users/donald/.m2/repository/org/fortasoft/gradle-maven-plugin/1.0.5/gradle-maven-plugin-1.0.5.jar
[ERROR] urls[1] = file:/Users/donald/.m2/repository/org/gradle/gradle-tooling-api/1.6/gradle-tooling-api-1.6.jar
[ERROR] urls[2] = file:/Users/donald/.m2/repository/org/codehaus/groovy/groovy-all/2.0.6/groovy-all-2.0.6.jar
[ERROR] urls[3] = file:/Users/donald/.m2/repository/org/codehaus/plexus/plexus-utils/1.1/plexus-utils-1.1.jar
[ERROR] Number of foreign imports: 1
[ERROR] import: Entry[import from realm ClassRealm[maven.api, parent: null]]
[ERROR]
[ERROR] -----------------------------------------------------
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginContainerException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn -rf :gradlebridge
Cobalt:scratch donald$

[psibre]

This is almost certainly MNG-5787.
The suggested workaround is to use the maven-shade-plugin, which I also saw mentioned in a similar issue with an ironic twist.