JavaFX报错java.lang.IllegalArgumentException:argumenttypemismatch

Exception in thread "JavaFX Application Thread" java.lang.IllegalArgumentException: argument type mismatchat 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 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:498)at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)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:198)at javafx.scene.Scene$DnDGesture.fireEvent(Scene.java:2933)at javafx.scene.Scene$DnDGesture.process(Scene.java:3012)at javafx.scene.Scene$DnDGesture.access$8200(Scene.java:2909)at javafx.scene.Scene$MouseHandler.process(Scene.java:3773)at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)at java.security.AccessController.doPrivileged(Native Method)at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:417)at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)at com.sun.glass.ui.View.handleMouseEvent(View.java:555)at com.sun.glass.ui.View.notifyMouse(View.java:937)at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)at java.lang.Thread.run(Thread.java:748)
错误代码

&＃64;FXMLvoid OnMouseDragReleased(ActionEvent event) {System.out.println("OnMouseDragOver");}
错误原因

由于控制器类的事件方法代码都是从Scene Builder中复制的&＃xff0c;而所有事件默认都是ActionEvent event参数&＃xff0c;所以报错。

Scene Builder默认的是这个&＃xff1a;

而我们需要的是这个&＃xff1a;

使用IDEA打开FXML文件&＃xff0c;将鼠标光标放到黄色块位置&＃xff0c;然后按快捷键Alt&＃43;Enter&＃xff0c;选择第一个将其改变。

然后控制器类就改过来了&＃xff1a;

&＃64;FXMLvoid OnMouseDragReleased(MouseDragEvent event) {System.out.println("OnMouseDragOver");}