Well, I think I get something interesting… The Alfresco portlet do work in Liferay but it looks like the Alfresco portlet bundled with Liferay (is it the same ???), I mean it's just an iFrame-like portlet, what you see is nothing but the alfresco web client in your portlet… To me there no real integration and this solution is not suitable for our business.
Anyway, I share the only solution that "works" in my case (still little bugs : no images in the portlet, due to this error I think : ERROR [transform.magick.AbstractImageMagickContentTransformer] ImageMagickContentTransformer not available: Failed to execute command: imconvert…)
WARNING : this is really not an elegant solution !! :
I deploy the modified version of Alfresco under a different name (let's say "Alfresco - portlet") in the liferay deploy folder. Start Tomcat to deploy it… Stop tomcat server, delete the WEB-INF folder of Alfresco Server (the UNmodified version) and replace it by the one deployed by liferay (the one situated in the "Alfresco - portlet" folder). Start tomcat again, have some errors, no images, but it "works" !!
I'm not going to improve this "solution" because I really don't know if I'm going the right way and, moreover, in the LifeRay RoadMap for next Release (coming soon…) it's written that Alfresco portlet integration will be enhanced…
But if anybody have a really functional solution, with a nice integration of Alfresco in Liferay, please post-it, I am still interested !!!
Regards,
Maxime.