<dependency>
    <maven>
        <groupId>org.eclipse.jdt</groupId>
        <artifactId>core</artifactId>
        <version>3.4.2</version>
    </maven>
    <jpp>
        <groupId>JPP</groupId>
        <artifactId>ecj</artifactId>
        <version>3.4.2</version>
    </jpp>
</dependency>