title: IllegalArgumentException when Event occur, javafx
body: <p>I have a fxml file which has registered a Controller. The Controller implements EventHandler and so the method handle(ActionEvent e). If the registered event occur the code in the handler method is processed, but not always. But this following Exception trace is printed. Do I have missed something ?</p>
  
  <pre><code>Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: argument type mismatch
      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:491)
      at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
      at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:491)
      at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
      at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1502)
      at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
      at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
      at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
      at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
      at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
      at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
      at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
      at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
      at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
      at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
      at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
      at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
      at javafx.event.Event.fireEvent(Event.java:203)
      at javafx.scene.Scene$MouseHandler.process(Scene.java:3544)
      at javafx.scene.Scene$MouseHandler.process(Scene.java:3375)
      at javafx.scene.Scene$MouseHandler.access$1900(Scene.java:3326)
      at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1617)
      at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2394)
      at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:312)
      at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:237)
      at java.security.AccessController.doPrivileged(Native Method)
      at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:354)
      at com.sun.glass.ui.View.handleMouseEvent(View.java:514)
      at com.sun.glass.ui.View.notifyMouse(View.java:877)
      at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
      at com.sun.glass.ui.gtk.GtkApplication.access$200(GtkApplication.java:47)
      at com.sun.glass.ui.gtk.GtkApplication$5$1.run(GtkApplication.java:137)
      at java.lang.Thread.run(Thread.java:724)
  </code></pre>