If a Python-based extension is installed in LibreOffice, and JRE is disabled in Advanced options, an "Enable JRE?" warning is shown at LibreOffice startup. As a Python-based extension example, you might try APSO [1]. Note that it might hand LibreOffice when tried to install first time. I had to kill soffice and re-run installation (without removing the incomplete installation) to successfully finish the installation. [1] https://extensions.libreoffice.org/extensions/apso-alternative-script-organizer-for-python
https://gerrit.libreoffice.org/61468
Mike Kaganski committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=f3ce30ec75a4d7116b9cd4d7b21d9aaa0e237eeb tdf#120363: try to avoid asking user to enable JVM when looking ... It will be available in 6.2.0. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.