I have not yet fought Neon, but on Mars, which was also not officially supported, I managed to get Jira to partially work with this installation URL:
Atlassian Connector for Eclipse 3.7 and later - http://update.atlassian.com/atlassian-eclipse-plugin/rest/e3.7
This allows me to see the list of tasks, select Jiras, and he will remember the working sets for each Jira I choose, but one important function for me that I cannot work with is the Team Synchronizing perspective. I CAN'T add the changed files to the changeset linked to the Jira, as I can in the Moon.
I can see incoming changes using jira related change sets, but not create outgoing jira related change sets.
I tried many times to install my Mars, trying to update Mylyn, but if I take version 3.20, it will be the foo-bar of my installation.
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