Program: 24530
Project: 24530
Buggy source:
private Future<?> startScenarioAsync(Long executionId,String name,SimulatorScenario scenario,List<ScenarioParameter> scenarioParameters){
  final ExecutorService executorService=Executors.newSingleThreadExecutor(r -> {
    Thread t=new Thread(r,"String_Node_Str" + name);
    t.setDaemon(true);
    return t;
  }
);
  return executorService.submit(() -> {
    try {
      if (scenario instanceof Executable) {
        if (scenarioParameters != null) {
          scenarioParameters.forEach(p -> addVariable(scenario,p.getName(),p.getValue()));
        }
        addVariable(scenario,ScenarioExecution.EXECUTION_ID,executionId);
        ((Executable)scenario).execute();
      }
 else {
        TestContext context=citrus.createTestContext();
        ReflectionUtils.doWithLocalMethods(scenario.getClass(),m -> {
          if (!m.getName().equals("String_Node_Str")) {
            return;
          }
          if (m.getParameterCount() != 1) {
            throw new SimulatorException("String_Node_Str" + m.getParameterCount());
          }
          Class<?> parameterType=m.getParameterTypes()[0];
          if (parameterType.equals(ScenarioDesigner.class)) {
            ScenarioDesigner designer=new ScenarioDesigner(scenario.getScenarioEndpoint(),citrus.getApplicationContext(),context);
            if (scenarioParameters != null) {
              scenarioParameters.forEach(p -> designer.variable(p.getName(),p.getValue()));
            }
            designer.variable(ScenarioExecution.EXECUTION_ID,executionId);
            CitrusAnnotations.injectAll(scenario,citrus,context);
            ReflectionUtils.invokeMethod(m,scenario,designer);
            citrus.run(designer.getTestCase(),context);
          }
 else           if (parameterType.equals(ScenarioRunner.class)) {
            ScenarioRunner runner=new ScenarioRunner(scenario.getScenarioEndpoint(),citrus.getApplicationContext(),context);
            if (scenarioParameters != null) {
              scenarioParameters.forEach(p -> runner.variable(p.getName(),p.getValue()));
            }
            runner.variable(ScenarioExecution.EXECUTION_ID,executionId);
            CitrusAnnotations.injectAll(scenario,citrus,context);
            try {
              runner.start();
              ReflectionUtils.invokeMethod(m,scenario,runner);
            }
  finally {
              runner.stop();
            }
          }
 else {
            throw new SimulatorException("String_Node_Str" + parameterType);
          }
        }
);
      }
      LOG.debug(String.format("String_Node_Str",name));
    }
 catch (    Exception e) {
      LOG.error(String.format("String_Node_Str",name),e);
    }
    executorService.shutdownNow();
  }
);
}

Fixed version (ground truth):
private Future<?> startScenarioAsync(Long executionId,String name,SimulatorScenario scenario,List<ScenarioParameter> scenarioParameters){
  final ExecutorService executorService=Executors.newSingleThreadExecutor(r -> {
    Thread t=new Thread(r,"String_Node_Str" + name);
    t.setDaemon(true);
    return t;
  }
);
  return executorService.submit(() -> {
    try {
      if (scenario instanceof Executable) {
        if (scenarioParameters != null) {
          scenarioParameters.forEach(p -> addVariable(scenario,p.getName(),p.getValue()));
        }
        addVariable(scenario,ScenarioExecution.EXECUTION_ID,executionId);
        ((Executable)scenario).execute();
      }
 else {
        TestContext context=citrus.createTestContext();
        ReflectionUtils.doWithLocalMethods(scenario.getClass(),m -> {
          if (m.getDeclaringClass().equals(SimulatorScenario.class)) {
            return;
          }
          if (!m.getName().equals("String_Node_Str")) {
            return;
          }
          if (m.getParameterCount() != 1) {
            throw new SimulatorException("String_Node_Str" + m.getParameterCount());
          }
          Class<?> parameterType=m.getParameterTypes()[0];
          if (parameterType.equals(ScenarioDesigner.class)) {
            ScenarioDesigner designer=new ScenarioDesigner(scenario.getScenarioEndpoint(),citrus.getApplicationContext(),context);
            if (scenarioParameters != null) {
              scenarioParameters.forEach(p -> designer.variable(p.getName(),p.getValue()));
            }
            designer.variable(ScenarioExecution.EXECUTION_ID,executionId);
            CitrusAnnotations.injectAll(scenario,citrus,context);
            ReflectionUtils.invokeMethod(m,scenario,designer);
            citrus.run(designer.getTestCase(),context);
          }
 else           if (parameterType.equals(ScenarioRunner.class)) {
            ScenarioRunner runner=new ScenarioRunner(scenario.getScenarioEndpoint(),citrus.getApplicationContext(),context);
            if (scenarioParameters != null) {
              scenarioParameters.forEach(p -> runner.variable(p.getName(),p.getValue()));
            }
            runner.variable(ScenarioExecution.EXECUTION_ID,executionId);
            CitrusAnnotations.injectAll(scenario,citrus,context);
            try {
              runner.start();
              ReflectionUtils.invokeMethod(m,scenario,runner);
            }
  finally {
              runner.stop();
            }
          }
 else {
            throw new SimulatorException("String_Node_Str" + parameterType);
          }
        }
);
      }
      LOG.debug(String.format("String_Node_Str",name));
    }
 catch (    Exception e) {
      LOG.error(String.format("String_Node_Str",name),e);
    }
    executorService.shutdownNow();
  }
);
}