Call swagger codegen scala from Gatling

How I can call a normal Scala class generated from swagger-codegen into my Gatling scenario test so the generation of the reports will be successfully.
Currently I am executing the gatling test with maven : mvn test
The Simulation class is invoked but this exception occur:

Caused by: java.lang.UnsupportedOperationException: There were no requests sent during the simulation, reports won’t be generated
at io.gatling.charts.report.ReportsGenerator.generateFor(ReportsGenerator.scala:48)
at io.gatling.app.LogFileProcessor.generateReports(RunResultProcessor.scala:64)
at io.gatling.app.LogFileProcessor.processRunResult(RunResultProcessor.scala:43)
at io.gatling.app.Gatling.start(Gatling.scala:66)
at io.gatling.app.Gatling$.start(Gatling.scala:57)
at io.gatling.app.Gatling$.fromArgs(Gatling.scala:49)
at io.gatling.app.Gatling$.main(Gatling.scala:43)
at io.gatling.app.Gatling.main(Gatling.scala)

and maven mark the build as failure. But there are requests but not called with Gatling ChainBuilder - they are generated with Jersey.
Can I execute Gatling scenario with reports generation using external Scala classes?