Answer : JavaFX append text to TextArea throws Exception
I have a thread that calculates the size of a directory.
I use walkFileTree for this.
To get some info, I append the actuall file to a textarea.
But when I have a lot of files (ex. > 300) I got
Exception in thread "JavaFX Application Thread" java.lang.ArrayIndexOutOfBoundsException
Here is the code:
private void startScheduledExecutorService() { Thread dt = new Thread(new Runnable() { public void run() { try { taStatus.appendText("Dateien werden ermittelt\n"); Files.walkFileTree(quellOrdner.toPath(), new SimpleFileVisitor<Path>() { @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) { size += attrs.size(); files++; taStatus.appendText(file.toString() + "\n"); return FileVisitResult.CONTINUE; } }); } catch (IOException e) { e.printStackTrace(); } } }, "dt"); dt.setDaemon(true); dt.start(); } When I create an ArrayList and add each file to it and append this ArrayList (each entry in a row) to the TextArea, it is working.
It looks like a problem with the thread speed ?
The full Exception
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException at com.sun.javafx.text.PrismTextLayout.addTextRun(PrismTextLayout.java:755) at com.sun.javafx.text.GlyphLayout.addTextRun(GlyphLayout.java:121) at com.sun.javafx.text.GlyphLayout.breakRuns(GlyphLayout.java:191) at com.sun.javafx.text.PrismTextLayout.buildRuns(PrismTextLayout.java:770) at com.sun.javafx.text.PrismTextLayout.layout(PrismTextLayout.java:1021) at com.sun.javafx.text.PrismTextLayout.ensureLayout(PrismTextLayout.java:223) at com.sun.javafx.text.PrismTextLayout.getBounds(PrismTextLayout.java:246) at javafx.scene.text.Text.getLogicalBounds(Text.java:358) at javafx.scene.text.Text.impl_computeGeomBounds(Text.java:1168) at javafx.scene.Node.updateGeomBounds(Node.java:3556) at javafx.scene.Node.getGeomBounds(Node.java:3509) at javafx.scene.Node.getLocalBounds(Node.java:3457) at javafx.scene.Node.updateTxBounds(Node.java:3620) at javafx.scene.Node.getTransformedBounds(Node.java:3403) at javafx.scene.Node.updateBounds(Node.java:538) at javafx.scene.Parent.updateBounds(Parent.java:1706) at javafx.scene.Parent.updateBounds(Parent.java:1706) at javafx.scene.Parent.updateBounds(Parent.java:1706) at javafx.scene.Parent.updateBounds(Parent.java:1706) at javafx.scene.Parent.updateBounds(Parent.java:1706) at javafx.scene.Parent.updateBounds(Parent.java:1706) at javafx.scene.Parent.updateBounds(Parent.java:1706) at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2404) at com.sun.javafx.tk.Toolkit.lambda$runPulse$30(Toolkit.java:314) at com.sun.javafx.tk.Toolkit$$Lambda$178/156290868.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:313) at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:340) at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:525) at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:505) at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$400(QuantumToolkit.java:334) at com.sun.javafx.tk.quantum.QuantumToolkit$$Lambda$47/104706045.run(Unknown Source) at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95) at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method) at com.sun.glass.ui.gtk.GtkApplication.lambda$null$48(GtkApplication.java:139) at com.sun.glass.ui.gtk.GtkApplication$$Lambda$43/1086508417.run(Unknown Source) at java.lang.Thread.run(Thread.java:745)