I've been reading http://www.jclouds.org/documentation/quickstart/openstack/ and https://groups.google.com/forum/?fromgroups#!forum/jclouds but I've not found any example to create an image from an OVF file in the OpenStack repository. Does anyone have any idea? I'd really appreciate any help. Thanks
This won't be possible with jclouds as it doesn't support the Image service (aka Glance) API yet. You can add a new image using the glance client though. You'll also want to look at this page about container formats.
Whether or not this actually works may be dependent on your OpenStack deployment and choice of hypervisor.