Problem

On Jira 7 there is a character limit for text fields that by default is set to 32767 characters.
A workaround is to set the configuration value to 0 so that there is no limit.

Step-by-step guide

To change the character limit:

  1. Go to Jira Administration- System - General configuration - Click  Advanced Settings:

  2. Find the jira.text.fields.character.limit  and set it to 0 or other value bigger then 32767


Link for related documentation

https://answers.atlassian.com/questions/32969642/jira-character-limits-on-comments-and-description-32767