It appears that as of Orekit 13.1, getMinDate and getMaxDate are now missing from BoundedPropagator. These methods were definitely available in Orekit 13.0.1.
The 13.1 documentation still references the incriminated methods though, so something is amiss there. Could changes on the wrapper side explain why the methods are unavailable while still up in the documentation?
I just take the opportunity to suggest (if you can) moving on to the jpype based wrapper rather than the historical, JCC one. There won’t be any casting needed there and the JCC wrapper is likely to be deprecated or worse with Orekit 14.0.