No problem. It’s good to see that SNAP is in use.
You can try the following:
GPF.getDefaultInstance().getOperatorSpiRegistry().loadOperatorSpis()
Actually this is done automatically since SNAP 5.0.
But you can investigate which operators are available:
GPF.getDefaultInstance().getOperatorSpiRegistry().getOperatorSpis()
As far as I know (I’m not one of the main developer of our cluster) all jars are in one directory and we put them on the class path. So actually not different to the local use case.