JavaFx: error cannot be idealized

Question

I created an application in JavaFx8 that works fine, but sometimes shows an exception, as indicated below. I do not understand why I get such an exception. Is there any way to track this exception. Or anyone who is familiar with this exception. Please help.

java.lang.NullPointerException at com.sun.pisces.PiscesRenderer.fillLCDAlphaMask(PiscesRenderer.java:334) at com.sun.prism.sw.SWGraphics.drawStringInternal(SWGraphics.java:776) at com.sun.prism.sw.SWGraphics.drawString(SWGraphics.java:732) at com.sun.javafx.sg.prism.NGText.renderText(NGText.java:319) at com.sun.javafx.sg.prism.NGText.renderContent(NGText.java:277) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:412) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69) at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1283) at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:237) at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:203) at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1254) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:412) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69) at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1283) at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:237) at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:203) at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1254) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:412) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69) at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1283) at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:237) at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:203) at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1254) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:412) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69) at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1283) at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:237) at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:203) at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1254) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:412) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69) at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1283) at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:237) at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:203) at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1254) at com.sun.javafx.sg.prism.NodeEffectInput.render(NodeEffectInput.java:154) at com.sun.javafx.sg.prism.NodeEffectInput.filter(NodeEffectInput.java:84) at com.sun.scenario.effect.Merge.filter(Merge.java:161) at com.sun.scenario.effect.DelegateEffect.filter(DelegateEffect.java:70) at com.sun.scenario.effect.impl.prism.PrEffectHelper.render(PrEffectHelper.java:164) at com.sun.javafx.sg.prism.NGNode$EffectFilter.render(NGNode.java:951) at com.sun.javafx.sg.prism.NGNode.renderEffect(NGNode.java:701) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:410) at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69) at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1283) at com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:99) at com.sun.javafx.tk.quantum.AbstractPainter.paintImpl(AbstractPainter.java:202) at com.sun.javafx.tk.quantum.PresentingPainter.run(PresentingPainter.java:95) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304) at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:129) at java.lang.Thread.run(Thread.java:724) 

Answer 1

Known issue fixed in subsequent builds

Your NullPointerException on line 334 of PiscesRendere.java is a known bug that should be fixed if you upgrade to a later build of JavaFX 8 .

RT-31384 fx8.0-b96: NullPointerException in fillLCDAlphaMask in sw pipeline

To fix such problems yourself in the future

• You can test your code using the latest Java 8 distribution (which includes the latest JavaFX distribution) .

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• You can check the error tracker and record the error if there is no error. You will need to provide additional information, for example. your environment, playback steps, and sample executable code that reproduces the error.

• You can independently debug the problem based on the JavaFX source code (for example, here is the source PiscesRenderer.java ). Please note that you will need to select the correct source tag according to your build.

• Or you can create and fix JavaFX yourself .