How to get value from Jira Resolve Issue Screen in Java

[Prashant Mali]

I want Comment field value and Resolution field value from this screen

[Nic Brough -Adaptavist-]

It's stored when the user makes the change.

In what context are you trying to "get" this value?  Read the history?  Code for an add-on?  Code for a Connect add-on?  Remote system over REST?  Email template?  etc...

[Prashant Mali]

When I am trying to resolve issue. JIRA resolve screen will open. there are two fields resolution and comment. I am calling post function on this transition.and I want these values from screen in my post function module which is added in my plugin.

Which JIRA api is used to fetch that value in that post function

I want code for an add-on

[Nic Brough -Adaptavist-]

Right, so it's a post-function add-on.  From memory, I think you can use issue.getModifiedFields() to find out what fields were changed during the transition.  That should at least get you the resolution, but I'm not sure if it would get the comment.