Java NullPointerException它可以工作，但有错误。试图找出错误_Java_Javafx_Nullpointerexception_Fxml_Fxmlloader

Java NullPointerException它可以工作，但有错误。试图找出错误

java javafx

Java NullPointerException它可以工作，但有错误。试图找出错误,java,javafx,nullpointerexception,fxml,fxmlloader,Java,Javafx,Nullpointerexception,Fxml,Fxmlloader,我有一个错误，当我点击“开始按钮”，它加载我一个新的fxml，我将在那里玩它，它工作正常，但控制台告诉我这个错误。。我不明白怎么解决它我的FXML：（只看startGame，这给了我一些问题）我的董事会FXML <VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="460.0" prefWidth="600.0" styleClass

我有一个错误，当我点击“开始按钮”，它加载我一个新的fxml，我将在那里玩它，它工作正常，但控制台告诉我这个错误。。我不明白怎么解决它

我的FXML：（只看startGame，这给了我一些问题）

我的董事会FXML

<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="460.0" prefWidth="600.0" styleClass="root" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="othello.controller.BoardController">
   <children>
      <MenuBar>
        <menus>
          <Menu mnemonicParsing="false" text="Game">
            <items>
                  <MenuItem mnemonicParsing="false" onAction="#cleanStart" text="New Game" />
                  <MenuItem mnemonicParsing="false" onAction="#restartGame" text="Restart" />
                  <SeparatorMenuItem mnemonicParsing="false" />
                  <MenuItem mnemonicParsing="false" onAction="#helpMe" text="Next move" />
                  <SeparatorMenuItem mnemonicParsing="false" />
                  <Menu mnemonicParsing="false" text="Music">
                    <items>
                      <MenuItem mnemonicParsing="false" onAction="#audioY" text="On" />
                        <MenuItem mnemonicParsing="false" onAction="#audioN" text="Off" />
                    </items>
                  </Menu>
                  <SeparatorMenuItem mnemonicParsing="false" />
              <MenuItem mnemonicParsing="false" onAction="#exitProgram" text="Quit" />
            </items>
          </Menu>
          <Menu mnemonicParsing="false" text="Help">
            <items>
              <MenuItem mnemonicParsing="false" onAction="#playRules2" text="How to play" />
              <MenuItem mnemonicParsing="false" onAction="#showAbout" text="About" />
            </items>
          </Menu>
          <Menu mnemonicParsing="false" text="Project">
               <items>
                  <MenuItem mnemonicParsing="false" onAction="#showBackground" text="Team Background" />
               </items>
          </Menu>
            <Menu mnemonicParsing="false" text="Log Match">
               <items>
                  <MenuItem mnemonicParsing="false" onAction="#openLog" text="Last 10 matches.." />
               </items>
            </Menu>
        </menus>
      </MenuBar>
      <SplitPane dividerPositions="0.6833333333333333" styleClass="root">
        <items>
          <AnchorPane maxWidth="410.0" minHeight="0.0" minWidth="-Infinity">
               <children>
                  <GridPane fx:id="myGrid" alignment="CENTER" gridLinesVisible="true" layoutX="3.0" layoutY="5.0" prefHeight="400.0" prefWidth="400.0" styleClass="scacchiera">
                    <columnConstraints>
                      <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                      <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                        <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                        <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                        <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                        <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                        <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                        <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
                    </columnConstraints>
                    <rowConstraints>
                      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                      <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                        <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                        <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                        <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                        <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                        <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
                    </rowConstraints>
                     <padding>
                        <Insets bottom="2.0" left="2.0" right="2.0" top="2.0" />
                     </padding>
                     <children>
                        <ImageView fx:id="imageView00" fitHeight="48.0" fitWidth="48.0" onMouseClicked="#handleOnMouseClicked" pickOnBounds="true" preserveRatio="true" />
                        <ImageView fx:id="imageView01" fitHeight="48.0" fitWidth="48.0" onMouseClicked="#handleOnMouseClicked" pickOnBounds="true" preserveRatio="true" GridPane.columnIndex="1" />
                        <ImageView fx:id="imageView02" fitHeight="48.0" fitWidth="48.0" onMouseClicked="#handleOnMouseClicked" pickOnBounds="true" preserveRatio="true" GridPane.columnIndex="2" />

                     </children>
                  </GridPane>
               </children>
            </AnchorPane>
          <AnchorPane SplitPane.resizableWithParent="false">
               <padding>
                  <Insets bottom="4.0" left="4.0" right="4.0" top="4.0" />
               </padding>
               <children>
                  <Button layoutX="115.0" layoutY="369.0" mnemonicParsing="false" onAction="#restartGame" text="Restart" textAlignment="CENTER" />
                  <TextField fx:id="txt_field_p1" layoutX="9.0" layoutY="36.0" promptText="Insert name.." />
                  <TextField fx:id="txt_field_p2" layoutX="9.0" layoutY="90.0" promptText="Insert name..." />
                  <Label layoutX="7.0" layoutY="14.0" styleClass="text" text="Player 1 name:" textFill="WHITE" />
                  <Label layoutX="7.0" layoutY="70.0" styleClass="text" text="Player 2 name:" textFill="WHITE" />
                  <Label layoutX="43.0" layoutY="151.0" styleClass="text" text="Choose color:" textFill="WHITE" />
                  <Label layoutX="10.0" layoutY="171.0" styleClass="text" text="P1" textFill="WHITE" />
                  <Label layoutX="100.0" layoutY="172.0" styleClass="text" text="P2" textFill="WHITE" />
                  <RadioButton fx:id="rd_p1_black" layoutX="46.0" layoutY="193.0" mnemonicParsing="false" onAction="#chooseColor" prefHeight="0.0" prefWidth="0.0">
                     <toggleGroup>
                        <ToggleGroup fx:id="group_p1" />
                     </toggleGroup></RadioButton>
                  <RadioButton fx:id="rd_p2_black" layoutX="134.0" layoutY="193.0" mnemonicParsing="false" onAction="#chooseColor" prefHeight="0.0" prefWidth="0.0">
                     <toggleGroup>
                        <ToggleGroup fx:id="group_p2" />
                     </toggleGroup></RadioButton>
                  <ImageView fitHeight="35.0" fitWidth="32.0" layoutX="11.0" layoutY="186.0" pickOnBounds="true" preserveRatio="true">
                     <image>
                        <Image url="@../images/black.png" />
                     </image>
                  </ImageView>
                  <ImageView fitHeight="35.0" fitWidth="32.0" layoutX="11.0" layoutY="218.0" pickOnBounds="true" preserveRatio="true">
                     <image>
                        <Image url="@../images/white.png" />
                     </image>
                  </ImageView>
                  <RadioButton fx:id="rd_p1_white" layoutX="46.0" layoutY="225.0" mnemonicParsing="false" onAction="#chooseColor" prefHeight="0.0" prefWidth="0.0" toggleGroup="$group_p1" />
                  <ImageView fitHeight="35.0" fitWidth="32.0" layoutX="101.0" layoutY="186.0" pickOnBounds="true" preserveRatio="true">
                     <image>
                        <Image url="@../images/black.png" />
                     </image>
                  </ImageView>
                  <ImageView fitHeight="35.0" fitWidth="32.0" layoutX="101.0" layoutY="218.0" pickOnBounds="true" preserveRatio="true">
                     <image>
                        <Image url="@../images/white.png" />
                     </image>
                  </ImageView>
                  <RadioButton fx:id="rd_p2_white" layoutX="134.0" layoutY="225.0" mnemonicParsing="false" onAction="#chooseColor" prefHeight="0.0" prefWidth="0.0" toggleGroup="$group_p2" />
                  <Label layoutX="67.0" layoutY="270.0" styleClass="text" text="Score:" textFill="WHITE" />
                  <Label layoutX="10.0" layoutY="298.0" styleClass="text" text="P1" textFill="WHITE" />
                  <Label layoutX="100.0" layoutY="298.0" styleClass="text" text="P2" textFill="WHITE" />
                  <Label fx:id="p1_totScore" layoutX="33.0" layoutY="312.0" styleClass="text" text="0" textFill="#d9dd96">
                     <font>
                        <Font size="36.0" />
                     </font>
                  </Label>
                  <Label fx:id="p2_totScore" layoutX="126.0" layoutY="313.0" styleClass="text" text="0" textFill="#d9dd96">
                     <font>
                        <Font size="36.0" />
                     </font>
                  </Label>
                  <Button fx:id="btn_start" layoutX="61.0" layoutY="369.0" mnemonicParsing="false" onAction="#newGame" text="Start" textAlignment="CENTER" />
                  <Button fx:id="btn_pass" layoutX="11.0" layoutY="369.0" mnemonicParsing="false" onAction="#passRound" text="Pass" />
               </children>
            </AnchorPane>
        </items>
         <padding>
            <Insets bottom="4.0" />
         </padding>
      </SplitPane>
      <GridPane prefHeight="20.0">
        <columnConstraints>
          <ColumnConstraints hgrow="SOMETIMES" maxWidth="20.0" minWidth="0.0" prefWidth="0.0" />
            <ColumnConstraints hgrow="SOMETIMES" maxWidth="30.0" minWidth="0.0" prefWidth="30.0" />
          <ColumnConstraints hgrow="SOMETIMES" minWidth="2.0" prefWidth="2.0" />
            <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
            <ColumnConstraints halignment="RIGHT" hgrow="SOMETIMES" maxWidth="30.0" minWidth="0.0" prefWidth="30.0" />
            <ColumnConstraints hgrow="SOMETIMES" maxWidth="20.0" minWidth="0.0" prefWidth="0.0" />
        </columnConstraints>
        <rowConstraints>
          <RowConstraints />
            <RowConstraints />
            <RowConstraints />
        </rowConstraints>
         <children>
            <ImageView fx:id="imgCount_p1" fitHeight="15.0" fitWidth="15.0" pickOnBounds="true" preserveRatio="true" GridPane.halignment="LEFT" GridPane.rowIndex="1" GridPane.valignment="CENTER">
               <image>
                  <Image url="@../images/black.png" />
               </image>
            </ImageView>
            <ImageView fx:id="imgCount_p2" fitHeight="15.0" fitWidth="15.0" pickOnBounds="true" preserveRatio="true" GridPane.columnIndex="5" GridPane.halignment="RIGHT" GridPane.rowIndex="1" GridPane.valignment="CENTER">
               <image>
                  <Image url="@../images/white.png" />
               </image>
            </ImageView>
            <Label fx:id="label_count_p1" styleClass="text" text="0" textFill="WHITE" GridPane.columnIndex="1" GridPane.rowIndex="1">
               <font>
                  <Font name="System Bold" size="16.0" />
               </font>
            </Label>
            <Label fx:id="label_count_p2" alignment="CENTER_RIGHT" styleClass="text" text="0" textFill="WHITE" GridPane.columnIndex="4" GridPane.rowIndex="1">
               <font>
                  <Font name="System Bold" size="16.0" />
               </font>
            </Label>
            <Label fx:id="label_output" alignment="CENTER_RIGHT" contentDisplay="CENTER" maxWidth="-Infinity" minWidth="-Infinity" prefWidth="300.0" styleClass="text" text="Black starts moving" textAlignment="CENTER" textFill="#f6ff00" GridPane.columnIndex="2" GridPane.rowIndex="1">
               <font>
                  <Font name="System Bold" size="14.0" />
               </font>
            </Label>
            <Label fx:id="label_coord" alignment="CENTER_RIGHT" contentDisplay="CENTER" maxWidth="-Infinity" minWidth="-Infinity" prefHeight="18.0" prefWidth="228.0" styleClass="text" text="0:0" textAlignment="CENTER" textFill="#f6ff00" GridPane.columnIndex="3" GridPane.rowIndex="1">
               <font>
                  <Font name="System Bold" size="14.0" />
               </font>
            </Label>
         </children>
      </GridPane>
      <ImageView fitHeight="48.0" fitWidth="48.0" pickOnBounds="true" preserveRatio="true" />
   </children>
</VBox>

我不认为这与FXML有任何关系，因为我有一个应用程序抛出相同的异常，但我没有使用任何FXML。当我在应用程序的主阶段上添加功能以更改到新的场景时，我的应用程序开始这样做。这些阶段的根父节点是一个边框窗格，其中菜单栏节点设置为“顶部”节点
我为防止出现这种情况而采取的解决方法（似乎效果很好）是在设置新场景之前，从上一个场景中的边框窗格中清除“top”节点。我添加了一个在设置新场景之前被调用的方法（需要保存对应用程序提供的“stage”的引用。start（stage））：
它似乎将菜单与父布局分离，但我可能弄错了

当然，这只适用于在边框窗格顶部有菜单栏的mine和类似应用程序。对于其他类型的根窗格，可能需要从用作场景根的任何类型的窗格的子节点列表中删除菜单栏？它看起来像一只虫子。你在Linux上运行吗？若有，分布情况等？你在不同的平台上试过吗？嗨，我只在Linux17.04Ubuntu上试过。我将编辑post并添加FXML。谢谢。这里的错误是：com.sun.JavaFX.scene.control.skin.MenuBarSkin.lambda$new$383（MenuBarSkin.java:304）上的线程“JavaFX应用程序线程”java.lang.NullPointerException中的异常在问题中留下了完整的堆栈跟踪-它提供了更多信息-并缩写了FXML（您不需要发布所有这些图像视图…）。异常何时发生？当你点击菜单项时？好，我已经编辑了我的线程。当我点击开始按钮来更改场景时，出现了错误。顺便说一句，发生这种情况时我使用的JDK版本是Oracle的（1.8.0_181）
<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="460.0" prefWidth="600.0" styleClass="root" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="othello.controller.BoardController"> <children> <MenuBar> <menus> <Menu mnemonicParsing="false" text="Game"> <items> <MenuItem mnemonicParsing="false" onAction="#cleanStart" text="New Game" /> <MenuItem mnemonicParsing="false" onAction="#restartGame" text="Restart" /> <SeparatorMenuItem mnemonicParsing="false" /> <MenuItem mnemonicParsing="false" onAction="#helpMe" text="Next move" /> <SeparatorMenuItem mnemonicParsing="false" /> <Menu mnemonicParsing="false" text="Music"> <items> <MenuItem mnemonicParsing="false" onAction="#audioY" text="On" /> <MenuItem mnemonicParsing="false" onAction="#audioN" text="Off" /> </items> </Menu> <SeparatorMenuItem mnemonicParsing="false" /> <MenuItem mnemonicParsing="false" onAction="#exitProgram" text="Quit" /> </items> </Menu> <Menu mnemonicParsing="false" text="Help"> <items> <MenuItem mnemonicParsing="false" onAction="#playRules2" text="How to play" /> <MenuItem mnemonicParsing="false" onAction="#showAbout" text="About" /> </items> </Menu> <Menu mnemonicParsing="false" text="Project"> <items> <MenuItem mnemonicParsing="false" onAction="#showBackground" text="Team Background" /> </items> </Menu> <Menu mnemonicParsing="false" text="Log Match"> <items> <MenuItem mnemonicParsing="false" onAction="#openLog" text="Last 10 matches.." /> </items> </Menu> </menus> </MenuBar> <SplitPane dividerPositions="0.6833333333333333" styleClass="root"> <items> <AnchorPane maxWidth="410.0" minHeight="0.0" minWidth="-Infinity"> <children> <GridPane fx:id="myGrid" alignment="CENTER" gridLinesVisible="true" layoutX="3.0" layoutY="5.0" prefHeight="400.0" prefWidth="400.0" styleClass="scacchiera"> <columnConstraints> <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> <ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> </columnConstraints> <rowConstraints> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> <RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" /> </rowConstraints> <padding> <Insets bottom="2.0" left="2.0" right="2.0" top="2.0" /> </padding> <children> <ImageView fx:id="imageView00" fitHeight="48.0" fitWidth="48.0" onMouseClicked="#handleOnMouseClicked" pickOnBounds="true" preserveRatio="true" /> <ImageView fx:id="imageView01" fitHeight="48.0" fitWidth="48.0" onMouseClicked="#handleOnMouseClicked" pickOnBounds="true" preserveRatio="true" GridPane.columnIndex="1" /> <ImageView fx:id="imageView02" fitHeight="48.0" fitWidth="48.0" onMouseClicked="#handleOnMouseClicked" pickOnBounds="true" preserveRatio="true" GridPane.columnIndex="2" /> </children> </GridPane> </children> </AnchorPane> <AnchorPane SplitPane.resizableWithParent="false"> <padding> <Insets bottom="4.0" left="4.0" right="4.0" top="4.0" /> </padding> <children> <Button layoutX="115.0" layoutY="369.0" mnemonicParsing="false" onAction="#restartGame" text="Restart" textAlignment="CENTER" /> <TextField fx:id="txt_field_p1" layoutX="9.0" layoutY="36.0" promptText="Insert name.." /> <TextField fx:id="txt_field_p2" layoutX="9.0" layoutY="90.0" promptText="Insert name..." /> <Label layoutX="7.0" layoutY="14.0" styleClass="text" text="Player 1 name:" textFill="WHITE" /> <Label layoutX="7.0" layoutY="70.0" styleClass="text" text="Player 2 name:" textFill="WHITE" /> <Label layoutX="43.0" layoutY="151.0" styleClass="text" text="Choose color:" textFill="WHITE" /> <Label layoutX="10.0" layoutY="171.0" styleClass="text" text="P1" textFill="WHITE" /> <Label layoutX="100.0" layoutY="172.0" styleClass="text" text="P2" textFill="WHITE" /> <RadioButton fx:id="rd_p1_black" layoutX="46.0" layoutY="193.0" mnemonicParsing="false" onAction="#chooseColor" prefHeight="0.0" prefWidth="0.0"> <toggleGroup> <ToggleGroup fx:id="group_p1" /> </toggleGroup></RadioButton> <RadioButton fx:id="rd_p2_black" layoutX="134.0" layoutY="193.0" mnemonicParsing="false" onAction="#chooseColor" prefHeight="0.0" prefWidth="0.0"> <toggleGroup> <ToggleGroup fx:id="group_p2" /> </toggleGroup></RadioButton> <ImageView fitHeight="35.0" fitWidth="32.0" layoutX="11.0" layoutY="186.0" pickOnBounds="true" preserveRatio="true"> <image> <Image url="@../images/black.png" /> </image> </ImageView> <ImageView fitHeight="35.0" fitWidth="32.0" layoutX="11.0" layoutY="218.0" pickOnBounds="true" preserveRatio="true"> <image> <Image url="@../images/white.png" /> </image> </ImageView> <RadioButton fx:id="rd_p1_white" layoutX="46.0" layoutY="225.0" mnemonicParsing="false" onAction="#chooseColor" prefHeight="0.0" prefWidth="0.0" toggleGroup="$group_p1" /> <ImageView fitHeight="35.0" fitWidth="32.0" layoutX="101.0" layoutY="186.0" pickOnBounds="true" preserveRatio="true"> <image> <Image url="@../images/black.png" /> </image> </ImageView> <ImageView fitHeight="35.0" fitWidth="32.0" layoutX="101.0" layoutY="218.0" pickOnBounds="true" preserveRatio="true"> <image> <Image url="@../images/white.png" /> </image> </ImageView> <RadioButton fx:id="rd_p2_white" layoutX="134.0" layoutY="225.0" mnemonicParsing="false" onAction="#chooseColor" prefHeight="0.0" prefWidth="0.0" toggleGroup="$group_p2" /> <Label layoutX="67.0" layoutY="270.0" styleClass="text" text="Score:" textFill="WHITE" /> <Label layoutX="10.0" layoutY="298.0" styleClass="text" text="P1" textFill="WHITE" /> <Label layoutX="100.0" layoutY="298.0" styleClass="text" text="P2" textFill="WHITE" /> <Label fx:id="p1_totScore" layoutX="33.0" layoutY="312.0" styleClass="text" text="0" textFill="#d9dd96"> </Label> <Label fx:id="p2_totScore" layoutX="126.0" layoutY="313.0" styleClass="text" text="0" textFill="#d9dd96"> </Label> <Button fx:id="btn_start" layoutX="61.0" layoutY="369.0" mnemonicParsing="false" onAction="#newGame" text="Start" textAlignment="CENTER" /> <Button fx:id="btn_pass" layoutX="11.0" layoutY="369.0" mnemonicParsing="false" onAction="#passRound" text="Pass" /> </children> </AnchorPane> </items> <padding> <Insets bottom="4.0" /> </padding> </SplitPane> <GridPane prefHeight="20.0"> <columnConstraints> <ColumnConstraints hgrow="SOMETIMES" maxWidth="20.0" minWidth="0.0" prefWidth="0.0" /> <ColumnConstraints hgrow="SOMETIMES" maxWidth="30.0" minWidth="0.0" prefWidth="30.0" /> <ColumnConstraints hgrow="SOMETIMES" minWidth="2.0" prefWidth="2.0" /> <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" /> <ColumnConstraints halignment="RIGHT" hgrow="SOMETIMES" maxWidth="30.0" minWidth="0.0" prefWidth="30.0" /> <ColumnConstraints hgrow="SOMETIMES" maxWidth="20.0" minWidth="0.0" prefWidth="0.0" /> </columnConstraints> <rowConstraints> <RowConstraints /> <RowConstraints /> <RowConstraints /> </rowConstraints> <children> <ImageView fx:id="imgCount_p1" fitHeight="15.0" fitWidth="15.0" pickOnBounds="true" preserveRatio="true" GridPane.halignment="LEFT" GridPane.rowIndex="1" GridPane.valignment="CENTER"> <image> <Image url="@../images/black.png" /> </image> </ImageView> <ImageView fx:id="imgCount_p2" fitHeight="15.0" fitWidth="15.0" pickOnBounds="true" preserveRatio="true" GridPane.columnIndex="5" GridPane.halignment="RIGHT" GridPane.rowIndex="1" GridPane.valignment="CENTER"> <image> <Image url="@../images/white.png" /> </image> </ImageView> <Label fx:id="label_count_p1" styleClass="text" text="0" textFill="WHITE" GridPane.columnIndex="1" GridPane.rowIndex="1"> </Label> <Label fx:id="label_count_p2" alignment="CENTER_RIGHT" styleClass="text" text="0" textFill="WHITE" GridPane.columnIndex="4" GridPane.rowIndex="1"> </Label> <Label fx:id="label_output" alignment="CENTER_RIGHT" contentDisplay="CENTER" maxWidth="-Infinity" minWidth="-Infinity" prefWidth="300.0" styleClass="text" text="Black starts moving" textAlignment="CENTER" textFill="#f6ff00" GridPane.columnIndex="2" GridPane.rowIndex="1"> </Label> <Label fx:id="label_coord" alignment="CENTER_RIGHT" contentDisplay="CENTER" maxWidth="-Infinity" minWidth="-Infinity" prefHeight="18.0" prefWidth="228.0" styleClass="text" text="0:0" textAlignment="CENTER" textFill="#f6ff00" GridPane.columnIndex="3" GridPane.rowIndex="1"> </Label> </children> </GridPane> <ImageView fitHeight="48.0" fitWidth="48.0" pickOnBounds="true" preserveRatio="true" /> </children> </VBox>

Exception in thread "JavaFX Application Thread" java.lang.NullPointerException at com.sun.javafx.scene.control.skin.MenuBarSkin.lambda$new$383(MenuBarSkin.java:304) at javafx.event.WeakEventHandler.handle(WeakEventHandler.java:79) at com.sun.javafx.event.CompositeEventHandler$WeakEventFilterRecord.handleCapturingEvent(CompositeEventHandler.java:312) at com.sun.javafx.event.CompositeEventHandler.dispatchCapturingEvent(CompositeEventHandler.java:98) at com.sun.javafx.event.EventHandlerManager.dispatchCapturingEvent(EventHandlerManager.java:223) at com.sun.javafx.event.EventHandlerManager.dispatchCapturingEvent(EventHandlerManager.java:180) at com.sun.javafx.event.CompositeEventDispatcher.dispatchCapturingEvent(CompositeEventDispatcher.java:43) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:52) 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$ClickGenerator.postProcess(Scene.java:3470) at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398) at javafx.scene.Scene$MouseHandler.process(Scene.java:3766) 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$354(GlassViewEventHandler.java:417) at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416) at com.sun.glass.ui.View.handleMouseEvent(View.java:555) at com.sun.glass.ui.View.notifyMouse(View.java:937) at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method) at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139) at java.lang.Thread.run(Thread.java:745)

private void clearBorderPane() { if ((stage != null) && (stage.getRoot() instanceof BorderPane)) { BorderPane pane = (BorderPane)stage.getRoot(); pane.setTop(null); } }