gistfile1.xml

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>aspectj-maven-plugin</artifactId>
    <version>1.5</version>
    <executions>
        <execution>
            <phase>process-classes</phase>
            <goals>
                <goal>compile</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <complianceLevel>1.6</complianceLevel>
    </configuration>
</plugin>