I used it with a regular maven project, and got it solved with this plugin dependency configuration for running the xjc plugin
:
<plugin>
<!-- Needed to run the plugin xjc en Java 8 or superior -->
<groupId>org.codehaus.mojo</groupId>
<artifactId>properties-maven-plugin</artifactId>
<version>1.0-alpha-2</version>
<executions>
<execution>
<id>set-additional-system-properties</id>
<goals>
<goal>set-system-properties</goal>
</goals>
</execution>
</executions>
<configuration>
<properties>
<property>
<name>javax.xml.accessExternalSchema</name>
<value>all</value>
</property>
<property>
<name>javax.xml.accessExternalDTD</name>
<value>all</value>
</property>
</properties>
</configuration>
</plugin>