Entry for SAP AS Java is not required for iFlow deployment. It is only required if deploying adapter module or BPM/BRM.
Lucas,
You mentioned that you are able to deploy some existing iFlows but not a new iFlow. By any chance do you have multiple Adapter Engines, i.e. Central and Decentral Adapter Engine?
Can you compare if there are differences in the value of the Adapter Engine in the iFlow that can be deployed vs the one that can't?
Regards
Eng Swee