我刚开始在我的一个项目中使用 NetBeans，我的 GUI 中需要一个仪表。我遇到了看起来很有前途的Steelseries，并下载了这个 JAR 文件：
http://www.java2s.com/Code/Jar/s/DownloadSteelSeries3926jar.htm
我创建了一个 Java 项目，将库添加到其中，并添加了 Swing 调色板。一些 bean 喜欢Lightbulb, Led, 并且TrafficLight工作正常；但是当我选择一个仪表时，我得到了这个错误：
“无法从 JAR 文件加载组件类 eu.hansolo.steelseries.extras.Radar。类本身已找到，但初始化它时出现问题，例如，由于静态初始化程序中的异常，或加载所需的附加类失败组件类。”
异常堆栈跟踪如下：
java.lang.NoClassDefFoundError: org/pushingpixels/trident/ease/TimelineEase
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.netbeans.modules.form.project.ClassPathUtils.loadClass(ClassPathUtils.java:114)
at org.netbeans.modules.form.MetaComponentCreator$5.run(MetaComponentCreator.java:1450)
at org.netbeans.modules.form.FormLAF$2.run(FormLAF.java:293)
at org.netbeans.modules.openide.util.NbMutexEventProvider$Event.doEventAccess(NbMutexEventProvider.java:138)
at org.netbeans.modules.openide.util.NbMutexEventProvider$Event.readAccess(NbMutexEventProvider.java:98)
at org.netbeans.modules.openide.util.LazyMutexImplementation.readAccess(LazyMutexImplementation.java:94)
at org.openide.util.Mutex.readAccess(Mutex.java:250)
at org.netbeans.modules.form.FormLAF.executeWithLookAndFeel(FormLAF.java:276)
at org.netbeans.modules.form.MetaComponentCreator.prepareClass(MetaComponentCreator.java:1446)
at org.netbeans.modules.form.MetaComponentCreator.precreateVisualComponent(MetaComponentCreator.java:258)
at org.netbeans.modules.form.MetaComponentCreator.precreateVisualComponent(MetaComponentCreator.java:298)
at org.netbeans.modules.form.HandleLayer$NewComponentDrag.init(HandleLayer.java:3369)
at org.netbeans.modules.form.HandleLayer$NewComponentDrag.<init>(HandleLayer.java:3361)
at org.netbeans.modules.form.HandleLayer$NewComponentDropListener.dragEnter(HandleLayer.java:3658)
at java.awt.dnd.DropTarget.dragEnter(DropTarget.java:358)
at sun.awt.dnd.SunDropTargetContextPeer.processEnterMessage(SunDropTargetContextPeer.java:331)
at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEnterEvent(SunDropTargetContextPeer.java:799)
at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:767)
at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:48)
at java.awt.Component.dispatchEventImpl(Component.java:4746)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.retargetMouseEnterExit(Container.java:4676)
at java.awt.LightweightDispatcher.trackDropTargetEnterExit(Container.java:4625)
at java.awt.LightweightDispatcher.trackMouseEnterExit(Container.java:4638)
at java.awt.LightweightDispatcher.processDropTargetEvent(Container.java:4591)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4461)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
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)
Caused by: java.lang.ClassNotFoundException: org.pushingpixels.trident.ease.TimelineEase
at org.netbeans.modules.form.project.ProjectClassLoader.findClass(ProjectClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 52 more