Unfortunately we cannot manage to write a "universal" q7-maven-plugin which an work with Maven 3.0 and Maven 3.1+, so we decided to solve it like this:

- q7-maven-plugin 1.3.x works with Maven 3.0.x

- q7-maven-plugin 1.4.x+ works with Maven 3.1+ (Current version is 1.4.1)

Maven fails with NoClassDefFoundError, if wrong plugin is selected. Following classes might be unresolved:

* org/sonatype/aether/RepositorySystem - indicates an older plugin is loaded into newer Maven

* org.eclipse.aether.impl.VersionResolver - inidcates that a newer plugin is loaded into older Maven

Latest version of Maven is available on the project site