JavaScript to Java String conversion is not correct

While testing the latest build of FX for JDK 9, I was doing some random navigation on yahoo.com with HelloWebView and got an IOOBE on one of the pages. The exception message does not cause the application to fail, and the content seems to be rendered correctly in spite of the error.

To reproduce, run HelloWebView as follows:

$ java HelloWebView http://www.thedailyheel.com/20-stars-you-didnt-know-were-twins/?utm_source=yahoo&utm_medium=All&utm_campaign=DHCelebTwins0829

java.lang.StringIndexOutOfBoundsException: begin 0, end 4, length 2
at java.lang.String.checkBoundsBeginEnd(String.java:3122)
at java.lang.String.substring(String.java:1910)
at com.sun.javafx.webkit.prism.WCGraphicsPrismContext.drawString(WCGraphicsPrismContext.java:960)
at com.sun.webkit.graphics.GraphicsDecoder.decode(GraphicsDecoder.java:290)
at com.sun.webkit.graphics.WCRenderQueue.decode(WCRenderQueue.java:91)
at com.sun.webkit.graphics.WCRenderQueue.decode(WCRenderQueue.java:102)
at com.sun.webkit.graphics.WCImage.flushRQ(WCImage.java:52)
at com.sun.javafx.webkit.prism.RTImage.lambda$getPixelBuffer$2(RTImage.java:163)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:307)
at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1158)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:632)
at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
at java.lang.Thread.run(Thread.java:804)
java.lang.StringIndexOutOfBoundsException: begin 0, end 4, length 2
at java.lang.String.checkBoundsBeginEnd(String.java:3122)
at java.lang.String.substring(String.java:1910)
at com.sun.javafx.webkit.prism.WCGraphicsPrismContext.drawString(WCGraphicsPrismContext.java:960)
at com.sun.webkit.graphics.GraphicsDecoder.decode(GraphicsDecoder.java:290)
at com.sun.webkit.graphics.WCRenderQueue.decode(WCRenderQueue.java:91)
at com.sun.webkit.graphics.WCRenderQueue.decode(WCRenderQueue.java:102)
at com.sun.webkit.graphics.WCImage.flushRQ(WCImage.java:52)
at com.sun.javafx.webkit.prism.RTImage.lambda$getPixelBuffer$2(RTImage.java:163)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:307)
at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1158)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:632)
at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
at java.lang.Thread.run(Thread.java:804)


2)
       java.lang.StringIndexOutOfBoundsException: String index out of range: 4
        at java.lang.String.substring(String.java:1963)
        at com.sun.javafx.webkit.prism.WCFontImpl.getGlyphsAndAdvances(WCFontImpl.java:120)
        at com.sun.webkit.network.URLLoader.twkDidReceiveData(Native Method)
        at com.sun.webkit.network.URLLoader.notifyDidReceiveData(URLLoader.java:844)
        at com.sun.webkit.network.URLLoader.lambda$didReceiveData$4(URLLoader.java:819)
        at com.sun.javafx.application.PlatformImpl.lambda$null$5(PlatformImpl.java:295)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.javafx.application.PlatformImpl.lambda$runLater$6(PlatformImpl.java:294)
        at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.lambda$null$3(WinApplication.java:191)
        at java.lang.Thread.run(Thread.java:745)