我一直在使用 Java 1.6-1.7 在 Netbeans 7.4 上开发一个基于 swing gui 的应用程序，并且运行良好，完全没有稳定性问题。
现在，根据我的客户的要求，他们有兴趣将应用程序迁移到 1.8 Java 下的 Netbeans 8.0。
根本没有涉及代码的任何问题，但是当我在调试模式下部署应用程序时，我得到了这个令人讨厌的错误，它使应用程序无用，因为它在应用程序启动后的几秒钟后没有继续稳定执行：
“发生 org.openide.util.RequestProcessor$SlowItem 异常”
我粘贴了完整的堆栈跟踪，并交叉手指看看是否有人知道可能丢失或发生了什么。
谢谢你。
java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:222)
Caused: java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal starting from ModuleCL@7ff319e[com.app.scripting.ruby] with possible defining loaders [ModuleCL@4b9cfd2c[org.apache.batik], ModuleCL@7ff319e[com.app.scripting.ruby]] and declared parents [ModuleCL@512524c[org.netbeans.swing.outline], ModuleCL@52159784[org.openide.awt], ModuleCL@32ed515[org.openide.windows], ModuleCL@4ec17086[org.netbeans.modules.options.api], org.netbeans.MainImpl$BootClassLoader@2acf57e3, ModuleCL@3118070f[org.openide.io], ModuleCL@45873d93[org.openide.nodes], ModuleCL@3abe744b[org.openide.explorer], ModuleCL@68a69b39[com.app.api]]
at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:224)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Caused: java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at org.netbeans.JarClassLoader.doLoadClass(JarClassLoader.java:289)
at org.netbeans.ProxyClassLoader.selfLoadClass(ProxyClassLoader.java:259)
Caused: java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal while loading org.apache.xerces.dom.ElementImpl; see http://wiki.netbeans.org/DevFaqTroubleshootClassNotFound
at org.netbeans.ProxyClassLoader.selfLoadClass(ProxyClassLoader.java:263)
at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.apache.xerces.dom.DOMImplementationImpl.createDocument(Unknown Source)
at org.apache.xerces.dom.CoreDOMImplementationImpl.createDocument(Unknown Source)
at org.openide.xml.XMLUtil.createDocument(XMLUtil.java:208)
at org.netbeans.modules.editor.settings.storage.preferences.PreferencesStorage$Writer.getDocument(PreferencesStorage.java:345)
at org.netbeans.modules.editor.settings.storage.Utils.save(Utils.java:312)
at org.netbeans.modules.editor.settings.storage.StorageImpl$1.run(StorageImpl.java:342)
at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:609)
at org.netbeans.modules.editor.settings.storage.StorageImpl$FilesystemTracker.runAtomicAction(StorageImpl.java:635)
at org.netbeans.modules.editor.settings.storage.StorageImpl._save(StorageImpl.java:335)
at org.netbeans.modules.editor.settings.storage.StorageImpl.save(StorageImpl.java:161)
at org.netbeans.modules.editor.settings.storage.api.EditorSettingsStorage.save(EditorSettingsStorage.java:111)
at org.netbeans.modules.editor.settings.storage.preferences.PreferencesImpl.flushSpi(PreferencesImpl.java:369)
at org.netbeans.modules.editor.settings.storage.preferences.PreferencesImpl$1.run(PreferencesImpl.java:410)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to
at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1464)
at org.netbeans.modules.editor.settings.storage.preferences.PreferencesImpl.asyncInvocationOfFlushSpi(PreferencesImpl.java:503)
at org.netbeans.modules.editor.settings.storage.preferences.PreferencesImpl.putSpi(PreferencesImpl.java:304)
at java.util.prefs.AbstractPreferences.put(AbstractPreferences.java:251)
at org.netbeans.modules.editor.settings.storage.preferences.PreferencesImpl.put(PreferencesImpl.java:149)
at java.util.prefs.AbstractPreferences.putBoolean(AbstractPreferences.java:470)
at org.netbeans.modules.editor.settings.storage.preferences.PreferencesImpl.putBoolean(PreferencesImpl.java:218)
at org.netbeans.spi.editor.AbstractEditorAction$PreferencesNodeAndListener.setPreferencesValue(AbstractEditorAction.java:778)
at org.netbeans.spi.editor.AbstractEditorAction$PreferencesNodeAndListener.propertyChange(AbstractEditorAction.java:794)
at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327)
at javax.swing.event.SwingPropertyChangeSupport.firePropertyChange(SwingPropertyChangeSupport.java:92)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263)
at javax.swing.AbstractAction.firePropertyChange(AbstractAction.java:276)
at org.netbeans.spi.editor.AbstractEditorAction.putValue(AbstractEditorAction.java:613)
at org.netbeans.spi.editor.AbstractEditorAction$PreferencesNodeAndListener.<init>(AbstractEditorAction.java:761)
at org.netbeans.spi.editor.AbstractEditorAction.checkPreferencesKey(AbstractEditorAction.java:707)
at org.netbeans.spi.editor.AbstractEditorAction.<init>(AbstractEditorAction.java:325)
at org.netbeans.modules.editor.lib2.actions.WrapperEditorAction.<init>(WrapperEditorAction.java:71)
at org.netbeans.modules.editor.lib2.actions.WrapperEditorAction.create(WrapperEditorAction.java:67)
at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.netbeans.core.startup.layers.BinaryFS$AttrImpl$MethodAndParams.invoke(BinaryFS.java:773)
at org.netbeans.core.startup.layers.BinaryFS$AttrImpl.getValue(BinaryFS.java:703)
at org.netbeans.core.startup.layers.BinaryFS$BFSBase.getAttribute(BinaryFS.java:549)
at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:944)
at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:877)
at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:940)
at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:877)
at org.openide.filesystems.MultiFileObject.getAttribute(MultiFileObject.java:798)
at org.openide.loaders.InstanceDataObject$Ser.instanceCreate(InstanceDataObject.java:1432)
at org.openide.loaders.InstanceDataObject.instanceCreate(InstanceDataObject.java:846)
at org.netbeans.modules.editor.impl.ActionsList.convertImpl(ActionsList.java:147)
at org.netbeans.modules.editor.impl.ActionsList.<init>(ActionsList.java:85)
at org.netbeans.modules.editor.impl.EditorActionsProvider.<init>(EditorActionsProvider.java:84)
at org.netbeans.modules.editor.impl.EditorActionsProvider.createInstance(EditorActionsProvider.java:88)
at org.netbeans.modules.editor.impl.EditorActionsProvider.createInstance(EditorActionsProvider.java:62)
at org.netbeans.modules.editor.mimelookup.impl.InstanceProviderLookup.rebuild(InstanceProviderLookup.java:90)
at org.netbeans.modules.editor.mimelookup.impl.InstanceProviderLookup.initialize(InstanceProviderLookup.java:85)
at org.openide.util.lookup.AbstractLookup.enterStorage(AbstractLookup.java:176)
at org.openide.util.lookup.AbstractLookup.lookupItem(AbstractLookup.java:430)
at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:421)
at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:222)
at org.netbeans.modules.editor.mimelookup.impl.SwitchLookup.lookup(SwitchLookup.java:90)
at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:222)
at org.netbeans.modules.editor.impl.EditorActionsProvider.getEditorActions(EditorActionsProvider.java:69)
at org.netbeans.modules.editor.NbEditorKit.getDeclaredActions(NbEditorKit.java:220)
at org.netbeans.editor.BaseKit.addActionsToMap(BaseKit.java:952)
at org.netbeans.editor.BaseKit.getActions(BaseKit.java:925)
at org.netbeans.modules.options.editor.keymap.EditorBridge.initActionMap(EditorBridge.java:358)
at org.netbeans.modules.options.editor.keymap.EditorBridge.getEditorActionsMap(EditorBridge.java:318)
at org.netbeans.modules.options.editor.keymap.EditorBridge.getActions(EditorBridge.java:105)
at org.netbeans.modules.options.keymap.KeymapModel$AL.run(KeymapModel.java:203)
at org.netbeans.modules.options.keymap.KeymapModel.waitFinished(KeymapModel.java:768)
at org.netbeans.modules.options.keymap.KeymapModel.ensureActionsLoaded(KeymapModel.java:739)
at org.netbeans.modules.options.keymap.KeymapModel.isDuplicateId(KeymapModel.java:390)
at org.netbeans.modules.options.keymap.ShortcutsFinderImpl.findActionForId(ShortcutsFinderImpl.java:99)
at org.netbeans.core.options.keymap.api.KeyStrokeUtils.getKeyStrokesForAction(KeyStrokeUtils.java:241)
at org.netbeans.core.output2.OutputTab$TabAction.getAcceleratorsFor(OutputTab.java:1013)
at org.netbeans.core.output2.OutputTab$TabAction.<init>(OutputTab.java:963)
at org.netbeans.core.output2.OutputTab.createActions(OutputTab.java:916)
at org.netbeans.core.output2.OutputTab.access$300(OutputTab.java:117)
at org.netbeans.core.output2.OutputTab$2.run(OutputTab.java:838)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)