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Wish I knew about that before! Thanks heaps for the reference.
Gonna put my function here for any future references too. Feel free to point out any improvements.

public Map<PropertyIdentifier, Encodable> getObjectPropertyListNotNull(RemoteDevice d, ObjectIdentifier obj) throws BACnetException{

        List<ObjectPropertyTypeDefinition> propsDefs = ObjectProperties.getObjectPropertyTypeDefinitions(obj.getObjectType());
        ArrayList<PropertyIdentifier> props = new ArrayList<PropertyIdentifier>(propsDefs.size());
        Map<PropertyIdentifier, Encodable> propValuesFinal = new HashMap<>();
        
        for(ObjectPropertyTypeDefinition prop : propsDefs){props.add(prop.getPropertyTypeDefinition().getPropertyIdentifier());}
        
        
        if(d.getObject(obj) == null){
            Map<PropertyIdentifier, Encodable> propValues = RequestUtils.getProperties(localDevice, d, obj, null, props.toArray(new PropertyIdentifier[props.size()]));
            propValues.forEach((pid, val) -> {
                if(val instanceof ErrorClassAndCode)
                    return;
                propValuesFinal.put(pid, val);
                d.setObjectProperty(obj, pid, val);
            });
        }
        else{
            for(PropertyIdentifier pid : props){
                Encodable val = d.getObject(obj).getProperty(pid);
                if(val != null){
                    propValuesFinal.put(pid, val);
                }
            }
        }
        return propValuesFinal;
    }

I was hoping there was a simple way to just get the objects property list since there are nearly 500 defined properties making try-catching a bit inefficient.
When using YABE I noticed how when you view a devices object it lists only the properties it has instead of a defined list of the same properties for every object of that type.

I'm trying to get a list of all the properties defined in an object on a remote device.

RequestUtils.getProperty( localDevice, remoteDevice, AnalogInRef, PropertyIdentifier.propertyList);

But it just throws and returns

com.serotonin.bacnet4j.exception.BACnetErrorException: device: other
  at com.serotonin.bacnet4j.util.RequestUtils.getProperty(RequestUtils.java:104)
  at test.main(test.java:101)

Same for PropertyIdentifier.listOfObjectPropertyReferences
So I am not sure how to go about this.
I'm using YABE (Yet Another BACnet Explorer) to run a simulator.