title: Random ArrayIndexOutOfBoundsException in JavaFX Application
body: <p>I have a rather large JavaFX Application which works well most of the time.
  However, sometimes I get random ArrayIndexOutOfBoundsExceptions when clicking through the application. I can't reproduce the errors and don't know when they appear: Sometimes I can click through the application without any problems, and sometimes the app crashes and the stacktrace appears.</p>
  
  <pre><code>Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException: -1
  at java.util.ArrayList.elementData(ArrayList.java:418)
  at java.util.ArrayList.get(ArrayList.java:431)
  at javafx.scene.Parent.updateCachedBounds(Parent.java:1591)
  at javafx.scene.Parent.recomputeBounds(Parent.java:1535)
  at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388)
  at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3078)
  at javafx.scene.Node.updateGeomBounds(Node.java:3577)
  at javafx.scene.Node.getGeomBounds(Node.java:3530)
  at javafx.scene.Node.getLocalBounds(Node.java:3478)
  at javafx.scene.Node.updateTxBounds(Node.java:3641)
  at javafx.scene.Node.getTransformedBounds(Node.java:3424)
  at javafx.scene.Node.updateBounds(Node.java:559)
  at javafx.scene.Parent.updateBounds(Parent.java:1719)
  at javafx.scene.Parent.updateBounds(Parent.java:1717)
  at javafx.scene.Parent.updateBounds(Parent.java:1717)
  at javafx.scene.Parent.updateBounds(Parent.java:1717)
  at javafx.scene.Parent.updateBounds(Parent.java:1717)
  at javafx.scene.Parent.updateBounds(Parent.java:1717)
  at javafx.scene.Parent.updateBounds(Parent.java:1717)
  at javafx.scene.Parent.updateBounds(Parent.java:1717)
  at javafx.scene.Parent.updateBounds(Parent.java:1717)
  at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2404)
  at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:355)
  at java.security.AccessController.doPrivileged(Native Method)
  at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:354)
  at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:381)
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:510)
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)
  at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
  at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
  at java.lang.Thread.run(Thread.java:745)
  </code></pre>
  
  <p>When reading the stacktrace, the only thing which caught my attention is that the error doesn't even happen in some of my code.
  Does anyone of you know problems like this and has an idea, where I could start investigating or what could be causing this problem?</p>
  
  <p>I tried it on JDK 1.8.0_74 (Windows 8.1 x64), JDK 1.8.0_77 (Windows 8.1 x64) and JDK 1.8.0_91 (OS X 10.11)</p>