<dependencies>
   <dependency>
      <maven>
         <groupId>com.thoughtworks.xstream</groupId>
         <artifactId>xstream</artifactId>
         <version>1.3</version>
      </maven>
      <jpp>
         <groupId>JPP</groupId>
         <artifactId>xstream</artifactId>
         <version>1.2.2</version>
      </jpp>
   </dependency>

   <dependency>
      <maven>
         <groupId>junit-addons</groupId>
         <artifactId>junit-addons</artifactId>
         <version>1.4</version>
      </maven>
      <jpp>
         <groupId>JPP/maven2</groupId>
         <artifactId>empty-dep</artifactId>
         <version>1.4</version>
      </jpp>
   </dependency>
</dependencies>