Migration from CUBA Platform
Migration from CUBA Platform to Jmix 2.1 requires several steps:
Migrate the project to Jmix 1.5 with Classic UI by following this guide. You may ignore problems in the UI layer on this step because the whole UI layer should be replaced anyway.
jmix-cubacompatibility module and update the usage of Jmix API accordingly.
Follow recommendations in the Migration from Classic UI section.