We want to upgrade drools libraries as those are very old (version 5). Please suggest a migration path i.e directly can we go to 9 or we need to move to 7 first and then 9. Thanks
I recommend migrating to version 7.x first (following this guide) and then moving to Apache KIE 10 (upcoming version) once available. You can refer to this document to update from drools 7 to 8 (and 10)