Question

我们的applet源代码是一种意大利面条（2000年编写，Java 1.3），我们想将它重新编译为Java 1.6或1.7。

当我测试它时，大多数Swing都可以，但是在一段时间后，发生Exception，这是EDT异常。具体来说，当拖动事件完成时，会出现一系列EDT异常。

这是对ActionListeners中I / O部分进行编码的问题，因为我已经读过在动作侦听器中编写I / O操作是不好的，EDT在执行动作时执行。

编辑：

这是经常性的例外

Exception in thread "AWT-EventQueue-3" java.lang.NullPointerException
    at javax.swing.BufferStrategyPaintManager.flushAccumulatedRegion(Unknown Source)
    at javax.swing.BufferStrategyPaintManager.copyArea(Unknown Source)
    at javax.swing.RepaintManager.copyArea(Unknown Source)
    at javax.swing.JViewport.blitDoubleBuffered(Unknown Source)
    at javax.swing.JViewport.windowBlitPaint(Unknown Source)
    at javax.swing.JViewport.setViewPosition(Unknown Source)
    at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.vsbStateChanged(Unknown Source)
    at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.stateChanged(Unknown Source)
    at javax.swing.DefaultBoundedRangeModel.fireStateChanged(Unknown Source)
    at javax.swing.DefaultBoundedRangeModel.setRangeProperties(Unknown Source)
    at javax.swing.DefaultBoundedRangeModel.setValue(Unknown Source)
    at javax.swing.JScrollBar.setValue(Unknown Source)
    at javax.swing.plaf.basic.BasicScrollBarUI$TrackListener.setValueFrom(Unknown Source)
    at javax.swing.plaf.basic.BasicScrollBarUI$TrackListener.mouseDragged(Unknown Source)
    at java.awt.Component.processMouseMotionEvent(Unknown Source)
    at javax.swing.JComponent.processMouseMotionEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$000(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$2.run(Unknown Source)
    at java.awt.EventQueue$2.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

Answer 1

我想这与java插件的版本有关。在java 1.6_10中，这个插件的新版本是发布，我只是禁用了控制面板中的java选项 Advance-＆gt; Java Plug In - ＆gt;启用下一代Java Plug in

当我禁用此功能时，不会再出现没有明显行为的重复出错。

我想这也与我们在Java 1.3时代编写的代码有关。

在applet的EDT中运行I / O的问题

1 个答案: