STEPS TO REPRODUCE
- Login as Admin
- Go to Administer Wiki > Mail > Mail Sending
- Fill in the information on fields (e.g. in 'Email address to send from', 'Email Server', 'Email Server Port', 'Email Sever Username', 'Email Server Password', 'Additional Properties')
- Click 'Save'
The configuration is saved without any warnings/errors.
When saving the page, there are some warnings encountered in console:
However, the information seems to be saved when returning to page and sharing a page by mail works (tested on JAVA 8 and JAVA 11).
The issue could not be reproduced on XWiki 11.4.