I think Jave 7 and JRE7 is fine. Java 6 is out of public support since Feb 2013:
https://blogs.oracle.com/henrik/entry/java_6_eol_h_h Christian -- You received this message because you are subscribed to the Google Groups "GWT Contributors" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit-contributors+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/google-web-toolkit-contributors/652f542f-78f6-468f-ba10-969324d811b2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
