"AWT-EventQueue-1" java.lang.ArrayIndexOutOfBoundsException: No such child-优快云博客

本文链接：https://blog.youkuaiyun.com/wuliwei85/article/details/84041129

本文探讨了在JavaUI环境中，多线程操作可能导致的ArrayIndexOutOfBoundsException异常，详细解释了异常产生的原因，并提供了将非主线程对UI进行的操作放入SwingUtilities.invokeLater()方法内的解决策略。

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详细异常如下：

Exception in thread "AWT-EventQueue-1" java.lang.ArrayIndexOutOfBoundsException: No such child: 1
	at java.awt.Container.getComponent(Container.java:281)
	at javax.swing.JComponent.rectangleIsObscured(JComponent.java:4337)
	at javax.swing.JComponent.paint(JComponent.java:1025)
	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5122)
	at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:285)
	at javax.swing.RepaintManager.paint(RepaintManager.java:1128)
	at javax.swing.JComponent._paintImmediately(JComponent.java:5070)
	at javax.swing.JComponent.paintImmediately(JComponent.java:4880)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:723)
	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:679)
	at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:659)
	at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

导致该异常发生的大致原因是：

Java UI是单线程的，如果在UI操作上使用了多线程，则会导致一些内部属性不同步情况，比如：主线程上正要进行重绘操作，已经获取到了父容器总共有3个子组件；此时，另外一个线程正好从父容器上删除了一个子组件；这就导致了子组件数不同步，当主线程要获取第3个子组件时，就会抛异常了，因为此时已经没有第3个子组件了。

解决办法：

将非主线程对UI进行的操作放入到以下run方法中

SwingUtilities.invokeLater(new Runnable() {
	public void run() {
		
	}
});