Java SE 6 Premier support end on Dec 2015. And recently Jenkins server requires Java 7. So all our build systems will have Java 7. It will be reasonable to build HPCC Java Embeded Plugin wiht Java 7 even though some Linux distro has Java 6 as default, such as Ubuntu 12.04 and CentOS 5/6.
Oracle Java SE Support: http://www.oracle.com/technetwork/java/eol-135779.html
Here is related quote:
Extended Support Life for Java SE 6
In April 2014 Oracle extended the support lifetime for Java SE 6. Before this extension the end of Premier Support was Dec 2013 and the end of Extended Support was scheduled for Jun 2017. The new support dates are: End of Premier Support on Dec 2015, and End of Extended Support on Dec 2018.