plugins/org.eclipse.jst.common.project.facet.core/plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.0"?>

<plugin>

  <extension point="org.eclipse.core.runtime.adapters">
    <factory 
      class="org.eclipse.jst.common.project.facet.core.internal.RuntimeClasspathProvider$Factory" 
      adaptableType="org.eclipse.wst.common.project.facet.core.runtime.IRuntime">
      <adapter type="org.eclipse.jst.common.project.facet.core.ClasspathProvider"/>
    </factory>
  </extension>

</plugin>