Java 删除时的ConcurrentModificationException

通常，当我看到

ConcurrentModificationException

时，这是由于对列表进行迭代并删除某些内容。在我的例子中，我只是引用了列表，并试图从中删除一些内容。这是我的密码：

getList(Client.class).remove(client);

这会引发一个

ConcurrentModificationException

classToListMap

是这样声明的

private Map<Class, ObservableList> classToListMap;

classToListMap

的填充方式如下：

private void createClassToListMap() {
        classToListMap = new LinkedHashMap<Class, ObservableList>();

        classToListMap.put(ManagementProfessional.class, managementProfessionalList);
        classToListMap.put(AdministrativeProfessional.class, administrativeProfessionalList);
...

---

其中，

ObservableCollections

是一个

org.jdesktop.ObservableCollections.ObservableCollections

您没有提供完整的信息，但我猜

可观察列表的
部分
可观察列表
意味着列表内容的更改会报告给观察者，该观察者可能在列表上迭代，或者试图在移除元素时触发的回调中进行自己的修改。如果您需要更多帮助，请发布完整的堆栈跟踪和有关list observer回调的信息。
从您提供的有限代码中很难看出这一点。你能分享一个完整的代码片段吗？看看你是如何填写classToListMap的，以及你的案例中的ObservableList是什么会很有趣。我猜你正在删除awt在处理事件时使用的UI对象。一种方法是使其不可见。仍然需要有关存储在
classToListMap
中的
ObservableList
实例初始化的更多信息。你自己创建这些对象吗？你是在他们身上注册观察员吗？或者，如果它们来自其他地方，它们是什么？该方法中的哪一行抛出异常？（提示：它是否被抛出到增强的for语句中？）谢谢，刚刚添加了堆栈跟踪。我来看看可观察列表
private synchronized void deleteClient() {
    DefaultMutableTreeNode node = getRightClickedNode();
    if (node.getUserObject() instanceof Client == false) {
        JOptionPane.showMessageDialog(null, "Please select a client to delete");
        return;
    }
    TreeSelectionListener[] listeners = getTreeSelectionListeners();
    for(TreeSelectionListener listener : listeners){
        removeTreeSelectionListener(listener);
    }
    ((DefaultTreeModel)getModel()).removeNodeFromParent(node);
    Client client = (Client) node.getUserObject();
    applicationContext.getDataRepository().getList(Client.class).remove(client);  //!!!!!!<-- Throws exception
    applicationContext.fireUpdate(new UpdateEvent(UpdateEvent.Type.DELETE, client, new UnknownEvent(this)));
    for(TreeSelectionListener listener : listeners){
        addTreeSelectionListener(listener);
    }
}

Exception in thread "AWT-EventQueue-0" java.util.ConcurrentModificationException
    at java.util.AbstractList$Itr.remove(AbstractList.java:380)
    at java.util.AbstractCollection.remove(AbstractCollection.java:293)
    at com.dvsd.profmetric.ui.gui.client.gui.ClientTree.deleteClient(ClientTree.java:147)
    at com.dvsd.profmetric.ui.gui.client.gui.ClientTree.access$300(ClientTree.java:39)
    at com.dvsd.profmetric.ui.gui.client.gui.ClientTree$3.actionPerformed(ClientTree.java:121)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
    at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
    at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877)
    at java.awt.Component.processMouseEvent(Component.java:6527)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6292)
    at java.awt.Container.processEvent(Container.java:2234)
    at java.awt.Component.dispatchEventImpl(Component.java:4883)
    at java.awt.Container.dispatchEventImpl(Container.java:2292)
    at java.awt.Component.dispatchEvent(Component.java:4705)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
    at java.awt.Container.dispatchEventImpl(Container.java:2278)
    at java.awt.Window.dispatchEventImpl(Window.java:2739)
    at java.awt.Component.dispatchEvent(Component.java:4705)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
    at java.awt.EventQueue.access$400(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:697)
    at java.awt.EventQueue$3.run(EventQueue.java:691)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.awt.EventQueue$4.run(EventQueue.java:719)
    at java.awt.EventQueue$4.run(EventQueue.java:717)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

private void createClassToListMap() {
        classToListMap = new LinkedHashMap<Class, ObservableList>();

        classToListMap.put(ManagementProfessional.class, managementProfessionalList);
        classToListMap.put(AdministrativeProfessional.class, administrativeProfessionalList);
...

List<ProfitMargin> profitMargins = simulation.getProfitMarginList();
profitMarginList = ObservableCollections.observableList(profitMargins);