should be using JavaSE-1.6 VM, and .classpath, codegen.targetPlatform, compliance and source should also all be 1.6; making these changes requires the project to have custom compiler settings in order to continue to import XPathAPI from its original location com.sun.org.apache.xpath.internal, which is still in JavaSE-1.6 rt.jar .

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.2"?>
<plugin>

   <extension-point id="featureUseTracker" name="Feature Usage Tracker" schema="schema/featureUseTracker.exsd"/>

</plugin>