callMethod not compatible with kotlin when Context is null

[yueban]

when using kotlin language. If I invoke fire on a stateMachine instance without any context. It failed on invoking transition method.

here is the code:

// init fsm
val builder = StateMachineBuilderFactory.create(
    CallStateMachine::class.java, FSMState::class.java, FSMEvent::class.java, CallContext::class.java
)
builder.externalTransition().from(FSMState.UnInit).to(FSMState.Initing).on(FSMEvent.doLogin).callMethod(FSMMethods.doLogin.name)
builder.newStateMachine(FSMState.UnInit, StateMachineConfiguration.create().enableDebugMode(true))

// fire event
fsm.fire(CallStateMachineWrapper.FSMEvent.doLogin);

here is the log:

Error during transition
org.squirrelframework.foundation.exception.SquirrelRuntimeException: 00010012 : couldn't invoke 'public final void com.yueban.squirrelstatemachinedemo.CallStateMachineWrapperOld$CallStateMachine.doLogin(com.yueban.squirrelstatemachinedemo.CallStateMachineWrapperOld$FSMState,com.yueban.squirrelstatemachinedemo.CallStateMachineWrapperOld$FSMState,com.yueban.squirrelstatemachinedemo.CallStateMachineWrapperOld$FSMEvent,com.yueban.squirrelstatemachinedemo.CallStateMachineWrapperOld$CallContext)' with [UnInit, Initing, doLogin, null] on com.yueban.squirrelstatemachinedemo.CallStateMachineWrapperOld$CallStateMachine@3712b94: null.
	at org.squirrelframework.foundation.util.ReflectUtils.invoke(ReflectUtils.java:337)
	at org.squirrelframework.foundation.fsm.impl.MethodCallActionImpl.invokeMethod(MethodCallActionImpl.java:91)
	at org.squirrelframework.foundation.fsm.impl.MethodCallActionImpl.execute(MethodCallActionImpl.java:69)
	at org.squirrelframework.foundation.fsm.impl.MethodCallActionProxyImpl.execute(MethodCallActionProxyImpl.java:47)
	at org.squirrelframework.foundation.fsm.impl.AbstractExecutionService$ActionContext.run(AbstractExecutionService.java:307)
	at org.squirrelframework.foundation.fsm.impl.AbstractExecutionService.doExecute(AbstractExecutionService.java:81)
	at org.squirrelframework.foundation.fsm.impl.AbstractExecutionService.executeActions(AbstractExecutionService.java:132)
	at org.squirrelframework.foundation.fsm.impl.AbstractExecutionService.execute(AbstractExecutionService.java:140)
	at org.squirrelframework.foundation.fsm.impl.AbstractStateMachine.processEvent(AbstractStateMachine.java:165)
	at org.squirrelframework.foundation.fsm.impl.AbstractStateMachine.processEvents(AbstractStateMachine.java:215)
	at org.squirrelframework.foundation.fsm.impl.AbstractStateMachine.internalFire(AbstractStateMachine.java:248)
	at org.squirrelframework.foundation.fsm.impl.AbstractStateMachine.fire(AbstractStateMachine.java:268)
	at org.squirrelframework.foundation.fsm.impl.AbstractStateMachine.fire(AbstractStateMachine.java:279)
	at org.squirrelframework.foundation.fsm.impl.AbstractStateMachine.fire(AbstractStateMachine.java:293)
	at com.yueban.squirrelstatemachinedemo.CallStateMachineWrapperTest.test(CallStateMachineWrapperTest.java:13)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)