Gatling support sending Array[Byte] as message with custom protocol

[Gregory Melekh]

Hello Gatling experts.

I use gatling 2.1.5 with custom UDP extension.

I need to send message as Array[Byte] via UDP connection.

When I do so , gatling throws following exception 

Simulation loadModel.ActivityManager started...

java.lang.reflect.InvocationTargetException

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at io.gatling.mojo.MainWithArgsInFile.runMain(MainWithArgsInFile.java:50)

at io.gatling.mojo.MainWithArgsInFile.main(MainWithArgsInFile.java:33)

Caused by: java.lang.ExceptionInInitializerError

at loadModel.ActivityManager.<init>(ActivityManager.scala:15)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

at java.lang.Class.newInstance(Class.java:379)

at io.gatling.core.runner.Runner.run(Runner.scala:36)

at io.gatling.app.Gatling$$anonfun$runSimulationIfNecessary$1.apply(Gatling.scala:132)

at io.gatling.app.Gatling$$anonfun$runSimulationIfNecessary$1.apply(Gatling.scala:117)

at scala.Option.getOrElse(Option.scala:121)

at io.gatling.app.Gatling.runSimulationIfNecessary(Gatling.scala:117)

at io.gatling.app.Gatling.start(Gatling.scala:73)

at io.gatling.app.Gatling$.fromArgs(Gatling.scala:59)

at io.gatling.app.Gatling$.main(Gatling.scala:44)

at io.gatling.app.Gatling.main(Gatling.scala)

... 6 more

Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to [B

at loadModel.Calamp3030And5000MessageType2$.<init>(Calamp3030And5000MessageType2.scala:52)

at loadModel.Calamp3030And5000MessageType2$.<clinit>(Calamp3030And5000MessageType2.scala)

... 21 more

(sending message as String works good for gatling ,but sends wrong data to the endpoint)

Is it possible ,gatling handles only String messages ?

[Gregory Melekh]

Can someone please direct me how to solve this problem?
Why Gatling cares, what kind of data has been sent?

Any help will be appreciated.