Github user johnsca commented on the issue:
The charms must all be built and deployed as Xenial, including openjdk.
However, we're also removing openjdk from the bundle, as it is now optional
(for choosing a JDK other than openjdk, as openjdk is provided by default), so
you can just remove that from the bundle entirely.
The changes to the bundle should be addressed under
https://issues.apache.org/jira/browse/BIGTOP-2550 once this is merged.
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