我正在学习拖放，但是对于我想学习的每一个例子，我都得到了以下异常java.lang.RuntimeException: cannot load system cursor: CopyDrop.32x32。有谁知道这个例外的含义是什么，我该如何解决？即使有这个example，我也会遇到这个例外。
java.lang.RuntimeException: cannot load system cursor: CopyDrop.32x32
at sun.awt.windows.WToolkit.lazilyLoadDesktopProperty(Unknown Source)
at java.awt.Toolkit.getDesktopProperty(Unknown Source)
at java.awt.dnd.DragSource.load(Unknown Source)
at java.awt.dnd.DragSource.<clinit>(Unknown Source)
at javax.swing.plaf.basic.DragRecognitionSupport.mousePressedImpl(Unknown Source)
at javax.swing.plaf.basic.DragRecognitionSupport.mousePressed(Unknown Source)
at javax.swing.plaf.basic.BasicListUI$Handler.mousePressed(Unknown Source)
at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(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.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.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)
Caused by: java.awt.AWTException: Exception: class java.security.PrivilegedActionException null occurred while loading: C:\Program Files\Java\jre1.8.0_101\lib\images\cursors\cursors.properties
at java.awt.Cursor.loadSystemCustomCursorProperties(Unknown Source)
at java.awt.Cursor.getSystemCustomCursor(Unknown Source)
... 39 more
Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
at javax.swing.plaf.basic.DragRecognitionSupport.mousePressedImpl(Unknown Source)
at javax.swing.plaf.basic.DragRecognitionSupport.mousePressed(Unknown Source)
at javax.swing.plaf.basic.BasicListUI$Handler.mousePressed(Unknown Source)
at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(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.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.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)
Caused by: java.lang.RuntimeException: failed to load system cursor: DnD.Cursor.CopyDrop : cannot load system cursor: CopyDrop.32x32
at java.awt.dnd.DragSource.load(Unknown Source)
at java.awt.dnd.DragSource.<clinit>(Unknown Source)
... 35 more
我有一个最小的例子，我得到同样的例外。
public DragAndDrop() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
TransferHandler transfer = new TransferHandler("text");
JPanel panel = new JPanel();
contentPane.add(panel, BorderLayout.CENTER);
JTextArea textArea = new JTextArea();
textArea.setDragEnabled(true);
textArea.setTransferHandler(transfer);
}
答案 0 :(得分：0)
我解决了这个问题！ 我安装了jre1.8.0_101，然后升级到jre1.8.0_111。 如果有人有关于DragAndDrop的这个问题，请确保你有最新版本的jre。