Can we make changes to the create button in jira server?

[Shubhangi Misra]

I want to fetch IP address of the client who clicks on the create button of jira server and creates an issue. I know the code of fetching IP address but don't know how to integrate it with jira. 

Please help.

[Danyal Iqbal]

There is no bullet proof way to do it safely and automatically . Let the user enter their own IP Address. If the users are non-technical, link the documentation on the create mask. 

Assuming you are working in an enterprise environment and.....

 this is a life or death situation for you, write a script to find the ip and create Jira ticket with this information over the REST API and distribute this script to all PCs. Instruct your users to create tickets with the script and edit the other fields in the next transition.

[Brant Schroeder]

I would suggest adding a custom field and capturing it that way instead of editing the JAR file.  There are several apps that allow for this or you can use this solution https://community.atlassian.com/t5/Jira-questions/Capture-local-ip-address-and-store-it-in-a-custom-field-at-the/qaq-p/32401