FULL PRODUCT VERSION :
java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Darwin bix.local 17.3.0 Darwin Kernel Version 17.3.0: Thu Nov 9 18:09:22 PST 2017; root:xnu-4570.31.3~1/RELEASE_X86_64 x86_64


A DESCRIPTION OF THE PROBLEM :
Running a WebView inside a JavaFX application that updates a <canvas> node whenever the window resizes. Eventually after resizing the window for a while, I always see an NPE from com.sun.javafx.webkit.prism.RTImage.getTexture(RTImage.java:81), which indicates that ResourceFactory.createRTTexture failed for some reason.


ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NullPointerException
at com.sun.javafx.webkit.prism.RTImage.getTexture(RTImage.java:81)
at com.sun.javafx.webkit.prism.RTImage.getGraphics(RTImage.java:69)
at com.sun.javafx.webkit.prism.WCBufferedContext.getGraphics(WCBufferedContext.java:64)
at com.sun.javafx.webkit.prism.WCGraphicsPrismContext$Composite.paint(WCGraphicsPrismContext.java:1485)
at com.sun.javafx.webkit.prism.WCGraphicsPrismContext.strokePath(WCGraphicsPrismContext.java:1749)
at com.sun.webkit.graphics.GraphicsDecoder.decode(GraphicsDecoder.java:278)
at com.sun.webkit.graphics.WCRenderQueue.decode(WCRenderQueue.java:92)
at com.sun.webkit.graphics.WCRenderQueue.decode(WCRenderQueue.java:103)
at com.sun.webkit.graphics.WCRenderQueue.decode(WCRenderQueue.java:110)
at com.sun.webkit.graphics.GraphicsDecoder.decode(GraphicsDecoder.java:340)
at com.sun.webkit.graphics.WCRenderQueue.decode(WCRenderQueue.java:92)
at com.sun.webkit.WebPage.paint2GC(WebPage.java:734)
at com.sun.webkit.WebPage.paint(WebPage.java:701)
at com.sun.javafx.sg.prism.web.NGWebView.renderContent(NGWebView.java:96)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.renderForClip(NGNode.java:2294)
at com.sun.javafx.sg.prism.NGNode.renderRectClip(NGNode.java:2188)
at com.sun.javafx.sg.prism.NGNode.renderClip(NGNode.java:2214)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2047)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.renderForClip(NGNode.java:2294)
at com.sun.javafx.sg.prism.NGNode.renderRectClip(NGNode.java:2188)
at com.sun.javafx.sg.prism.NGNode.renderClip(NGNode.java:2214)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2047)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:477)
at com.sun.javafx.tk.quantum.ViewPainter.paintImpl(ViewPainter.java:323)
at com.sun.javafx.tk.quantum.PresentingPainter.run(PresentingPainter.java:91)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
at java.lang.Thread.run(Thread.java:748)

REPRODUCIBILITY :
This bug can be reproduced always.