Version SQ 8.9
On attempting to paste XML into the box Administration->Configuration->Languages->Java-> Treewalker Filters that is longer that 4000 chars.
Error message: Validation failed. ‘value’ length (4028) is longer than the maximum authorized (4000)
This is far too short to capture a custom configuration. A good size shall be ~ 4x’s this - see a representative checkstyle: checkstyle/google_checks.xml at 2954d8723003ef229f5825510a433ab8c60f2774 · checkstyle/checkstyle · GitHub