AFAIK AEM 6.0 supports Java 1.8 since SP 2. See http://docs.adobe.com/docs/en/aem/6-0/release-notes-sp2.html#par_title_8

Any ideas where can I find updated Day Communique 5 DAM Core? It's part of AEM so may be you have some suggestion.

I'm getting the following error for each image when installing the content package with assets on author.22.05.2015 18:20:41.772 *ERROR* [JobHandler: /etc/workflow/instances/2015-05-22/model_619191127071372:/content/dam/sitename/images/features/tollfre_br.png/jcr:content/metadata] com.adobe.granite....