cobertura does not properly support Java 8. see mojohaus/cobertura-maven-plugin#21
diff --git a/pom.xml b/pom.xml
index 43001e5..2ead2bc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -280,6 +280,7 @@
                     <instrumentation>
                         <excludes>
                             <exclude>**/HelpMojo.class</exclude>
+                            <exclude>**/BuildMacMojo.class</exclude>
                         </excludes>
                     </instrumentation>    
                 </configuration>