Передать данные в другую форму - Java

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Формулировка задачи:

Добрый вечер! В контроллере главного окна приложения есть метод getMaxNomReg();, который возвращает последний элемент из списка TreeSet. Есть контроллер второй формы, в которой в переменную int maxNomReg нужно записать результат возвращаемый этой функцией. Как это можно сделать?

Решение задачи: «Передать данные в другую форму»

textual
Листинг программы 
  1. Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
  2.     at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1770)
  3.     at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1653)
  4.     at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
  5.     at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  6.     at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  7.     at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  8.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  9.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  10.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  11.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  12.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  13.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  14.     at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  15.     at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
  16.     at javafx.event.Event.fireEvent(Event.java:198)
  17.     at javafx.scene.Node.fireEvent(Node.java:8390)
  18.     at javafx.scene.control.Button.fire(Button.java:185)
  19.     at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
  20.     at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
  21.     at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
  22.     at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
  23.     at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
  24.     at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  25.     at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  26.     at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  27.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  28.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  29.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  30.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  31.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  32.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  33.     at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  34.     at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
  35.     at javafx.event.Event.fireEvent(Event.java:198)
  36.     at javafx.scene.Scene$MouseHandler.process(Scene.java:3758)
  37.     at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3486)
  38.     at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
  39.     at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2495)
  40.     at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:350)
  41.     at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
  42.     at java.security.AccessController.doPrivileged(Native Method)
  43.     at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$350(GlassViewEventHandler.java:385)
  44.     at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$211/1246785726.get(Unknown Source)
  45.     at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:404)
  46.     at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:384)
  47.     at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
  48.     at com.sun.glass.ui.View.notifyMouse(View.java:927)
  49.     at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method)
  50.     at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:128)
  51.     at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:511)
  52.     at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107)
  53.     at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:593)
  54.     at javafx.stage.Stage.showAndWait(Stage.java:463)
  55.     at regconfig.controllers.MainController.showAddDialog(MainController.java:129)
  56.     at regconfig.controllers.MainController.onBtnPress(MainController.java:171)
  57.     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  58.     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  59.     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  60.     at java.lang.reflect.Method.invoke(Method.java:497)
  61.     at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
  62.     at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
  63.     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  64.     at java.lang.reflect.Method.invoke(Method.java:497)
  65.     at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
  66.     at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1765)
  67.     at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1653)
  68.     at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
  69.     at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  70.     at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  71.     at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  72.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  73.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  74.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  75.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  76.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  77.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  78.     at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  79.     at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
  80.     at javafx.event.Event.fireEvent(Event.java:198)
  81.     at javafx.scene.Node.fireEvent(Node.java:8390)
  82.     at javafx.scene.control.Button.fire(Button.java:185)
  83.     at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
  84.     at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
  85.     at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
  86.     at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
  87.     at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
  88.     at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  89.     at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  90.     at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  91.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  92.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  93.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  94.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  95.     at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  96.     at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  97.     at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  98.     at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
  99.     at javafx.event.Event.fireEvent(Event.java:198)
  100.     at javafx.scene.Scene$MouseHandler.process(Scene.java:3758)
  101.     at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3486)
  102.     at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
  103.     at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2495)
  104.     at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:350)
  105.     at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
  106.     at java.security.AccessController.doPrivileged(Native Method)
  107.     at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$350(GlassViewEventHandler.java:385)
  108.     at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$211/1246785726.get(Unknown Source)
  109.     at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:404)
  110.     at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:384)
  111.     at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
  112.     at com.sun.glass.ui.View.notifyMouse(View.java:927)
  113.     at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
  114.     at com.sun.glass.ui.win.WinApplication.lambda$null$145(WinApplication.java:101)
  115.     at com.sun.glass.ui.win.WinApplication$$Lambda$38/1656834162.run(Unknown Source)
  116.     at java.lang.Thread.run(Thread.java:745)
  117. Caused by: java.lang.reflect.InvocationTargetException
  118.     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  119.     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  120.     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  121.     at java.lang.reflect.Method.invoke(Method.java:497)
  122.     at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
  123.     at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
  124.     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  125.     at java.lang.reflect.Method.invoke(Method.java:497)
  126.     at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
  127.     at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1765)
  128.     ... 114 more
  129. Caused by: java.lang.NullPointerException
  130.     at regconfig.controllers.AddController.btnOkPress(AddController.java:116)
  131.     ... 124 more

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