我正在尝试使用 JavaFX 标签和组，通过鼠标拖动将它们移动到屏幕上。新节点从某些线程添加到动画组中。
然而，有时我会突然看到以下异常 - 我假设，当某些节点重叠时。但我不知道问题是什么......因为我的代码不涉及。有谁知道这个异常和根本原因（使用JDK 1.8.0.-112）？
谢谢
'JavaFX Application Thread' lambda$main$68 - Thread[JavaFX Application Thread,5,main] threw an uncaught exception: java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.ArrayList.elementData(ArrayList.java:418) ~[?:1.8.0_112]
at java.util.ArrayList.get(ArrayList.java:431) ~[?:1.8.0_112]
at com.sun.javafx.collections.ObservableListWrapper.get(ObservableListWrapper.java:89) ~[jfxrt.jar:?]
at com.sun.javafx.collections.VetoableListDecorator.get(VetoableListDecorator.java:306) ~[jfxrt.jar:?]
at javafx.scene.Parent.updateCachedBounds(Parent.java:1591) ~[jfxrt.jar:?]
at javafx.scene.Parent.recomputeBounds(Parent.java:1535) ~[jfxrt.jar:?]
at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) ~[jfxrt.jar:?]
at javafx.scene.layout.Region.impl_computeGeomBounds(Region.java:3078) ~[jfxrt.jar:?]
at javafx.scene.Node.updateGeomBounds(Node.java:3579) ~[jfxrt.jar:?]
at javafx.scene.Node.getGeomBounds(Node.java:3532) ~[jfxrt.jar:?]
at javafx.scene.Node.getLocalBounds(Node.java:3480) ~[jfxrt.jar:?]
at javafx.scene.Node.updateTxBounds(Node.java:3643) ~[jfxrt.jar:?]
at javafx.scene.Node.getTransformedBounds(Node.java:3426) ~[jfxrt.jar:?]
at javafx.scene.Parent.getChildTransformedBounds(Parent.java:1732) ~[jfxrt.jar:?]
at javafx.scene.Parent.updateCachedBounds(Parent.java:1596) ~[jfxrt.jar:?]
at javafx.scene.Parent.recomputeBounds(Parent.java:1535) ~[jfxrt.jar:?]
at javafx.scene.Parent.impl_computeGeomBounds(Parent.java:1388) ~[jfxrt.jar:?]
at javafx.scene.Node.updateGeomBounds(Node.java:3579) ~[jfxrt.jar:?]
at javafx.scene.Node.getGeomBounds(Node.java:3532) ~[jfxrt.jar:?]
at javafx.scene.Node.getLocalBounds(Node.java:3480) ~[jfxrt.jar:?]
at javafx.scene.Node.impl_intersectsBounds(Node.java:5015) ~[jfxrt.jar:?]
at javafx.scene.Parent.impl_pickNodeLocal(Parent.java:705) ~[jfxrt.jar:?]
at javafx.scene.Node.impl_pickNode(Node.java:4914) ~[jfxrt.jar:?]
at javafx.scene.Scene$MouseHandler.pickNode(Scene.java:3899) ~[jfxrt.jar:?]
at javafx.scene.Scene$MouseHandler.access$1600(Scene.java:3485) ~[jfxrt.jar:?]
at javafx.scene.Scene.pick(Scene.java:1942) ~[jfxrt.jar:?]
at javafx.scene.Scene.access$6700(Scene.java:159) ~[jfxrt.jar:?]
at javafx.scene.Scene$MouseHandler.process(Scene.java:3799) ~[jfxrt.jar:?]
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485) ~[jfxrt.jar:?]
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762) ~[jfxrt.jar:?]
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494) ~[jfxrt.jar:?]
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381) ~[jfxrt.jar:?]
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295) ~[jfxrt.jar:?]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_112]
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417) ~[jfxrt.jar:?]
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) ~[jfxrt.jar:?]
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416) ~[jfxrt.jar:?]
at com.sun.glass.ui.View.handleMouseEvent(View.java:555) ~[jfxrt.jar:?]
at com.sun.glass.ui.View.notifyMouse(View.java:937) ~[jfxrt.jar:?]
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) ~[jfxrt.jar:?]
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191) ~[jfxrt.jar:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_112]
我认为，它与 Label (=BorderPane) 添加方法有关。我引入它是为了缩短Java FX应用程序线程处理时间。这有问题吗？
private Queue<BacklogGroupAction> todoList = new ConcurrentLinkedQueue<>();
class BacklogGroupAction {
boolean add;
boolean visibleState;
BorderPane dv;
public BacklogGroupAction(boolean add, boolean visibleState, BorderPane dv) {
this.add = add;
this.visibleState = visibleState;
this.dv = dv;
}
}
private synchronized void processBacklogGroupList() {
if (Platform.isFxApplicationThread()) {
while (!todoList.isEmpty()) {
BacklogGroupAction p = todoList.poll();
if (p.add) {
p.dv.setVisible(p.visibleState);
backlogGroup.getChildren()
.add(p.dv);
} else
backlogGroup.getChildren()
.remove(p.dv);
}
backlogGroup.applyCss();
backlogGroup.layout();
} else
logger.error("This is not FX Application Thread");
}
感谢你的帮助。
上面的“processBacklogGroupList”代码实际上是正确的并且有效......（那么为什么-1..？）
问题出在完全不同的地方，其中定义的动画不在 JFX 应用程序线程中运行 - 但稍后发生了异常。
感谢@sillyfly 指出了真正的问题
当尝试更改绑定到的 ObservableList 时，通常会发生这种情况
来自 JavaFX UI 线程以外的线程的节点，或者当
在更改期间操作列表。在这两种情况下通常都包裹
Platform.runLater 中的违规调用解决了问题。参见例如
这个相关问题。 ——sillyfly 6 月 27 日 10:03"
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