Github user jburwell commented on the issue: https://github.com/apache/cloudstack/pull/1638 @rhtyd there is a difference between supporting Java8 and using it as the default version. By changing the POMs, Maven will require that Java8 in order to use CloudStack dependencies. Furthermore, making Java8 ripples into supported Tomcat versions and Linux distributions. Therefore, we agreed sometime ago that 4.x would support Java8, and 5.0.0 would require/default to it. Personally, I would like to adopt Java8 as soon as possible, but we have to recognize that many of our users can move so quickly. I would also like to do it once we have Jetty embedded so that the upgrade is much simpler for users of Linux distributions because they will no longer be concerned with version matching Tomcat.
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