Receiving CAM message with userTaggedValue but an exception ClassNotFoundException observed in the log

[SafrasIqbal]

I am trying to understand how V2X communication happens here.

Reading through UserTaggedValueReadingApp.log and it throws error as class not found. Applications are loaded correctly and additional class CamSendingApp$MyComplexTaggedValue this also found in the absolute class path. I have no idea how to fix this. any help here will be really appreciate.

'[2021-11-30 23:34:13,429 INFO  - Set up (at simulation time 4.000,000,000 s)
2021-11-30 23:34:14,326 ERROR - An error occurred
java.lang.ClassNotFoundException: org.eclipse.mosaic.app.tutorial.cam.CamSendingApp$MyComplexTaggedValue
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:398)
	at java.base/java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:756)
	at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1995)
	at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1862)
	at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2169)
	at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1679)
	at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:493)
	at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:451)
	at org.eclipse.mosaic.lib.util.SerializationUtils.fromBytes(SerializationUtils.java:56)
	at org.eclipse.mosaic.app.tutorial.cam.UserTaggedValueReadingApp.onMessageReceived(UserTaggedValueReadingApp.java:60)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.AbstractSimulationUnit.processReceivedV2xMessage(AbstractSimulationUnit.java:349)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.AbstractSimulationUnit.preProcessEvent(AbstractSimulationUnit.java:192)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.VehicleUnit.processEvent(VehicleUnit.java:104)
	at org.eclipse.mosaic.lib.util.scheduling.Event.execute(Event.java:223)
	at org.eclipse.mosaic.lib.util.scheduling.DefaultEventScheduler.scheduleEvents(DefaultEventScheduler.java:85)
	at org.eclipse.mosaic.fed.application.ambassador.ApplicationAmbassador.processTimeAdvanceGrant(ApplicationAmbassador.java:228)
	at org.eclipse.mosaic.rti.api.AbstractFederateAmbassador.advanceTime(AbstractFederateAmbassador.java:111)
	at org.eclipse.mosaic.rti.time.SequentialTimeManagement.runSimulation(SequentialTimeManagement.java:90)
	at org.eclipse.mosaic.starter.MosaicSimulation.runSimulation(MosaicSimulation.java:189)
	at org.eclipse.mosaic.starter.MosaicStarter.execute(MosaicStarter.java:135)
	at org.eclipse.mosaic.starter.MosaicStarter.main(MosaicStarter.java:77)
2021-11-30 23:34:14,343 ERROR - An error occurred
java.lang.ClassNotFoundException: org.eclipse.mosaic.app.tutorial.cam.CamSendingApp$MyComplexTaggedValue
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:398)
	at java.base/java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:756)
	at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1995)
	at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1862)
	at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2169)
	at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1679)
	at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:493)
	at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:451)
	at org.eclipse.mosaic.lib.util.SerializationUtils.fromBytes(SerializationUtils.java:56)
	at org.eclipse.mosaic.app.tutorial.cam.UserTaggedValueReadingApp.onMessageReceived(UserTaggedValueReadingApp.java:60)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.AbstractSimulationUnit.processReceivedV2xMessage(AbstractSimulationUnit.java:349)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.AbstractSimulationUnit.preProcessEvent(AbstractSimulationUnit.java:192)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.VehicleUnit.processEvent(VehicleUnit.java:104)
	at org.eclipse.mosaic.lib.util.scheduling.Event.execute(Event.java:223)
	at org.eclipse.mosaic.lib.util.scheduling.DefaultEventScheduler.scheduleEvents(DefaultEventScheduler.java:85)
	at org.eclipse.mosaic.fed.application.ambassador.ApplicationAmbassador.processTimeAdvanceGrant(ApplicationAmbassador.java:228)
	at org.eclipse.mosaic.rti.api.AbstractFederateAmbassador.advanceTime(AbstractFederateAmbassador.java:111)
	at org.eclipse.mosaic.rti.time.SequentialTimeManagement.runSimulation(SequentialTimeManagement.java:90)
	at org.eclipse.mosaic.starter.MosaicSimulation.runSimulation(MosaicSimulation.java:189)
	at org.eclipse.mosaic.starter.MosaicStarter.execute(MosaicStarter.java:135)
	at org.eclipse.mosaic.starter.MosaicStarter.main(MosaicStarter.java:77)
2021-11-30 23:34:14,696 ERROR - An error occurred
java.lang.ClassNotFoundException: org.eclipse.mosaic.app.tutorial.cam.CamSendingApp$MyComplexTaggedValue
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:398)
	at java.base/java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:756)
	at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1995)
	at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1862)
	at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2169)
	at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1679)
	at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:493)
	at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:451)
	at org.eclipse.mosaic.lib.util.SerializationUtils.fromBytes(SerializationUtils.java:56)
	at org.eclipse.mosaic.app.tutorial.cam.UserTaggedValueReadingApp.onMessageReceived(UserTaggedValueReadingApp.java:60)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.AbstractSimulationUnit.processReceivedV2xMessage(AbstractSimulationUnit.java:349)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.AbstractSimulationUnit.preProcessEvent(AbstractSimulationUnit.java:192)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.VehicleUnit.processEvent(VehicleUnit.java:104)
	at org.eclipse.mosaic.lib.util.scheduling.Event.execute(Event.java:223)
	at org.eclipse.mosaic.lib.util.scheduling.DefaultEventScheduler.scheduleEvents(DefaultEventScheduler.java:85)
	at org.eclipse.mosaic.fed.application.ambassador.ApplicationAmbassador.processTimeAdvanceGrant(ApplicationAmbassador.java:228)
	at org.eclipse.mosaic.rti.api.AbstractFederateAmbassador.advanceTime(AbstractFederateAmbassador.java:111)
	at org.eclipse.mosaic.rti.time.SequentialTimeManagement.runSimulation(SequentialTimeManagement.java:90)
	at org.eclipse.mosaic.starter.MosaicSimulation.runSimulation(MosaicSimulation.java:189)
	at org.eclipse.mosaic.starter.MosaicStarter.execute(MosaicStarter.java:135)
	at org.eclipse.mosaic.starter.MosaicStarter.main(MosaicStarter.java:77)
2021-11-30 23:34:14,710 ERROR - An error occurred
java.lang.ClassNotFoundException: org.eclipse.mosaic.app.tutorial.cam.CamSendingApp$MyComplexTaggedValue
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:398)
	at java.base/java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:756)
	at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1995)
	at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1862)
	at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2169)
	at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1679)
	at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:493)
	at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:451)
	at org.eclipse.mosaic.lib.util.SerializationUtils.fromBytes(SerializationUtils.java:56)
	at org.eclipse.mosaic.app.tutorial.cam.UserTaggedValueReadingApp.onMessageReceived(UserTaggedValueReadingApp.java:60)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.AbstractSimulationUnit.processReceivedV2xMessage(AbstractSimulationUnit.java:349)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.AbstractSimulationUnit.preProcessEvent(AbstractSimulationUnit.java:192)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.VehicleUnit.processEvent(VehicleUnit.java:104)
	at org.eclipse.mosaic.lib.util.scheduling.Event.execute(Event.java:223)
	at org.eclipse.mosaic.lib.util.scheduling.DefaultEventScheduler.scheduleEvents(DefaultEventScheduler.java:85)
	at org.eclipse.mosaic.fed.application.ambassador.ApplicationAmbassador.processTimeAdvanceGrant(ApplicationAmbassador.java:228)
	at org.eclipse.mosaic.rti.api.AbstractFederateAmbassador.advanceTime(AbstractFederateAmbassador.java:111)
	at org.eclipse.mosaic.rti.time.SequentialTimeManagement.runSimulation(SequentialTimeManagement.java:90)
	at org.eclipse.mosaic.starter.MosaicSimulation.runSimulation(MosaicSimulation.java:189)
	at org.eclipse.mosaic.starter.MosaicStarter.execute(MosaicStarter.java:135)
	at org.eclipse.mosaic.starter.MosaicStarter.main(MosaicStarter.java:77)
2021-11-30 23:34:14,757 ERROR - An error occurred
java.lang.ClassNotFoundException: org.eclipse.mosaic.app.tutorial.cam.CamSendingApp$MyComplexTaggedValue
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:398)
	at java.base/java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:756)
	at java.base/java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1995)
	at java.base/java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1862)
	at java.base/java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2169)
	at java.base/java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1679)
	at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:493)
	at java.base/java.io.ObjectInputStream.readObject(ObjectInputStream.java:451)
	at org.eclipse.mosaic.lib.util.SerializationUtils.fromBytes(SerializationUtils.java:56)
	at org.eclipse.mosaic.app.tutorial.cam.UserTaggedValueReadingApp.onMessageReceived(UserTaggedValueReadingApp.java:60)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.AbstractSimulationUnit.processReceivedV2xMessage(AbstractSimulationUnit.java:349)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.AbstractSimulationUnit.preProcessEvent(AbstractSimulationUnit.java:192)
	at org.eclipse.mosaic.fed.application.ambassador.simulation.VehicleUnit.processEvent(VehicleUnit.java:104)
	at org.eclipse.mosaic.lib.util.scheduling.Event.execute(Event.java:223)
	at org.eclipse.mosaic.lib.util.scheduling.DefaultEventScheduler.scheduleEvents(DefaultEventScheduler.java:85)
	at org.eclipse.mosaic.fed.application.ambassador.ApplicationAmbassador.processTimeAdvanceGrant(ApplicationAmbassador.java:228)
	at org.eclipse.mosaic.rti.api.AbstractFederateAmbassador.advanceTime(AbstractFederateAmbassador.java:111)
	at org.eclipse.mosaic.rti.time.SequentialTimeManagement.runSimulation(SequentialTimeManagement.java:90)
	at org.eclipse.mosaic.starter.MosaicSimulation.runSimulation(MosaicSimulation.java:189)
	at org.eclipse.mosaic.starter.MosaicStarter.execute(MosaicStarter.java:135)
	at org.eclipse.mosaic.starter.MosaicStarter.main(MosaicStarter.java:77)](url)

[kschrab]

Hi, the problem seems to be, that the application simulator uses a custom classloader to load applications from the jar-files of the scenario. However, during deserialization of the custom byte array the default classloader is used, which does not know the scenario-specific jar files. This is general problem we need to solve.

You can workaround this problem by copying the jar files (e.g. example-applications-21.1.jar) from the application directory of your scenario to the lib/mosaic directory of your MOSAIC installation.

[SafrasIqbal]

Hi @kschrab , Thank you for your prompt reply. It worked when I placed the jar file in /mosaic/bundle/target/lib/mosaic directory. Appreciate your support. Thank you.

[kschrab]

@SafrasIqbal we fixed the error with the latest release 22.0.