</plugin>
<plugin>
<groupId>org.eclipse.xtend</groupId>
<artifactId>xtend-maven-plugin</artifactId>
<version>2.3.1</version>
<configuration>
<outputDirectory>xtend-gen</outputDirectory>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.7</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>xtend-gen</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>

[INFO] --- xtend-maven-plugin:2.3.1:compile (default) @ de.dlr.ft.exchange.base.xtend ---
4686 [main] INFO e.compiler.batch.XtendBatchCompiler - Compiling 1 source file to xtend-gen