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Getting error for lab 8

Author	Message
LHS Posts: 26	Posted 22:03 Apr 07, 2018 \| Not sure how to make any sense of the error im getting. Eclipse isnt showing anything wrong with syntax. Exception in Application start method Exception in thread "main" java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source) Caused by: java.lang.RuntimeException: Exception in Application start method at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917) at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.IllegalArgumentException: Children: duplicate children added: parent = Grid hgap=0.0, vgap=0.0, alignment=CENTER at javafx.scene.Parent$2.onProposedChange(Parent.java:454) at com.sun.javafx.collections.VetoableListDecorator.add(VetoableListDecorator.java:206) at javafx.scene.layout.GridPane.add(GridPane.java:965) at Lab8.MazeGUIPane.start(MazeGUIPane.java:42) at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863) at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326) at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294) at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177) ... 1 more Could you give me a idea of what I am doing wrong? I have e(fx)clipse installed and your ClickCounter example works on my computer.
jhurley Posts: 207	Posted 22:31 Apr 07, 2018 \| Look carefully at the row and column indices where you are adding labels to the grid pane. Make sure you are using the loop counters where you mean to.

Author

Message

LHS

Posts: 26

Posted 22:03 Apr 07, 2018 |

Not sure how to make any sense of the error im getting. Eclipse isnt showing anything wrong with syntax.

Exception in Application start method
Exception in thread "main" java.lang.reflect.InvocationTargetException
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
   at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
   at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
   at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Children: duplicate children added: parent = Grid hgap=0.0, vgap=0.0, alignment=CENTER
   at javafx.scene.Parent$2.onProposedChange(Parent.java:454)
   at com.sun.javafx.collections.VetoableListDecorator.add(VetoableListDecorator.java:206)
   at javafx.scene.layout.GridPane.add(GridPane.java:965)
   at Lab8.MazeGUIPane.start(MazeGUIPane.java:42)
   at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
   at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
   at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
   at java.security.AccessController.doPrivileged(Native Method)
   at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
   at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
   at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
   at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
   ... 1 more

Could you give me a idea of what I am doing wrong?

I have e(fx)clipse installed and your ClickCounter example works on my computer.

jhurley

Posts: 207

Posted 22:31 Apr 07, 2018 |

Look carefully at the row and column indices where you are adding labels to the grid pane. Make sure you are using the loop counters where you mean to.