  <chapter id="requirements">
      <title>Requirements</title>

      <para>Gemini Blueprint 2.x binaries require JDK level 6.0 or above, 
      and <ulink url="http://www2.osgi.org/Specifications/HomePage?section=2">OSGi
      R4.2</ulink> (though R4.1 and even R4.0 might work) or above. For JDK 1.5, consider using Gemini Blueprint 1.x.
      For JDK 1.4, consider using Spring Dynamic Modules 1.x.
      </para>
      <para>
      Bundles deployed for use with Gemini Blueprint should specify
      <literal>"Bundle-ManifestVersion: 2"</literal> in their manifest (require OSGi R4 behaviour).
      Note that for OSGi 4.2 specific functionality (such as the Blueprint Container),
      an appropriate container needs to be used.
      </para>
      <para>
      We test against <ulink
      url="http://www.eclipse.org/equinox/">Equinox</ulink> and <ulink
      url="http://felix.apache.org/">Felix</ulink> as part of our
      release process.
      </para>
  </chapter>