Hermes in combination with MultiModal - silently reverts to qsim

[gac55]

We have been testing Hermes and discovered a silent incompatibility with using the Multi Modal contrib.

Controller:

public class RunMultimodalMatsim {
    public static void main(String[] args) {

        Config config = ConfigUtils.loadConfig(args[0], new MultiModalConfigGroup());
		
	final Scenario scenario = ScenarioUtils.loadScenario(config);		
        PrepareMultiModalScenario.run(scenario);
        Controler controler = new Controler(scenario);
	controler.addOverridingModule(new MultiModalModule());

        controler.run();
    }
}

I attach the full logs which feature a copy of the input configuration. As you can see hermes is clearly specified as the mobsim to be used.

		<param name="mobsim" value="hermes" />

and is also configured specifically.

.... but during the simulation we see:

2021-08-25T15:40:59,880  INFO Injector:85 org.matsim.core.mobsim.qsim.components.QSimComponentsConfig 

For some reason MATSim then silently reverts to qsim for an unknown reason. If there is some incompatibility, perhaps there should be a warning.

logs.txt

[KasiaKoz]

Adding an override at the end of your controller:

controler.addOverridingModule(new ForceHermesModule());

where

package ...;

import org.matsim.core.mobsim.hermes.HermesProvider;
import org.matsim.core.controler.AbstractModule;

public class ForceHermesModule extends AbstractModule {

    public void install() {
        this.bindMobsim().toProvider(HermesProvider.class);
    }
}

will force the use of hermes with multimodal. I stepped through it in debug and it does use multimodal's scoring and travel time computations, and the mobsim used is indeed hermes. But you will loose some functionality provided in qsim that (i dont think) exists in hermes, like cars passing bikes on shared links. I'm trying to get to the bottom of these things here: #2181.