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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