Custom plugin/add-on on cloud version of Jira

Question

Hello,

We would like to upgrade our instance of Jira from server installation to cloud.
 We are, however, concerned about a custom plug-in we have developed to our 'server instance' of Jira. This plug-in is about showing an extra drop-down field when creating an issue. It allows users to select from a list of values that come from another system. Behind the scenes, an HTTP request is made to one of our internal systems which returns a list of values to Jira and displayed to the end user.

To make this work we have done the following:
 1. developed 2 .jar files (that hold code) and one .vm file (that hold UI elements).
 2. copied one of the jar files to this location: \jira-home\plugins\installed-plugins
 3. copied the other jar file to this location: \jira\atlassian-jira\WEB-INF\lib
 4. copied the .vm file to this location: \jira\atlassian-jira\WEB-INF\classes	emplates\plugins\fields\edit
 5. from the admin panel ('Plugins' -> 'Manage Addons') we enabled the custom plugin 
 6. from admin panel ( Issues -> Fields -> Custom Fields) we enabled the field on various screens.

To summarize we have 2 questions:
 1. Is it still possible to have such a custom field in Jira cloud installation? if yes, how? if not, what are the alternatives?
 2. Can the method '/rest/api/2/worklog/updated' (from Jira API) return the value set on such a custom field?

Thanks

Nic Brough -Adaptavist- · Accepted Answer

You can't install Server add-ons on Cloud.  In fact, you've not even written a proper add-on there, you've written a "type 2" and a "type 1" (which you should not do) and then hacked core code (which is even worse).  Even if Atlassian were accepting new Server add-ons for Cloud (they're not), there is no way this one would make it in.

You'll need to re-do this as a Connect add-on if you want to add it to Cloud, OR come up with a way to do it properly that fits within the functionality Cloud provides.  If you could describe what this add-on does for your end-users, we might be able to help you with that, or give you more focussed Connect guidance.

To do it as a Connect add-on, have a look at https://developer.atlassian.com/static/connect/docs/beta/modules/jira/issue-field.html and yes, you'll be able to use the REST interface to fetch it, although "fetch a worklog" is nonsense as they apply to issues, not fields.