对于初学者包jar文件的问题,这个问题是不是这么多在NetBeans IDE编程为开发NetBeans项目(例如使用NetBeans平台框架)。NetBeans平台项目 - 与具有相关
我试图使用的BeanUtils库来反思我的域模型,并提供在属性表中显示的属性。示例代码:
public class MyNode extends AbstractNode implements PropertyChangeListener {
private static final PropertyUtilsBean bean = new PropertyUtilsBean();
// snip
protected Sheet createSheet() {
Sheet sheet = Sheet.createDefault();
Sheet.Set set = Sheet.createPropertiesSet();
APIObject obj = getLookup().lookup (APIObject.class);
PropertyDescriptor[] descriptors = bean.getPropertyDescriptors(obj);
for (PropertyDescriptor d : descriptors) {
Method readMethod = d.getReadMethod();
Method writeMethod = d.getWriteMethod();
Class valueType = d.getClass();
Property p = new PropertySupport.Reflection(obj, valueType, readMethod, writeMethod);
set.put(p);
}
sheet.put(set);
return sheet;
}
我已经创建了周围的commons-BeanUtils的-1.8.3.jar的封装模块,以及包含上面的代码我的模块中添加的模块的依赖关系。一切都很好。当我尝试运行该程序并打开属性表视图(即..上面的代码实际上得到运行),我收到以下错误:
java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330)
at java.lang.ClassLoader.loadClass(ClassLoader.java:254)
at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:259)
Caused: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory starting from [email protected][org.apache.commons.beanutils] with possible defining loaders [[email protected][org.netbeans.libs.commons_logging]] and declared parents []
at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:261)
at java.lang.ClassLoader.loadClass(ClassLoader.java:254)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:399)
Caused: java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at org.apache.commons.beanutils.PropertyUtilsBean.<init>(PropertyUtilsBean.java:132)
at org.myorg.myeditor.MyNode.<clinit>(MyNode.java:35)
at org.myorg.myeditor.MyEditor.<init>(MyEditor.java:33)
at org.myorg.myeditor.OpenEditorAction.actionPerformed(OpenEditorAction.java:13)
at org.openide.awt.AlwaysEnabledAction$1.run(AlwaysEnabledAction.java:139)
at org.netbeans.modules.openide.util.ActionsBridge.implPerformAction(ActionsBridge.java:83)
at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:67)
at org.openide.awt.AlwaysEnabledAction.actionPerformed(AlwaysEnabledAction.java:142)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:389)
at com.apple.laf.ScreenMenuItem.actionPerformed(ScreenMenuItem.java:95)
at java.awt.MenuItem.processActionEvent(MenuItem.java:627)
at java.awt.MenuItem.processEvent(MenuItem.java:586)
at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:317)
at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:305)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:638)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:125)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
据我所知,BeanUtils的使用共享记录组件。我曾尝试以两种不同的方式添加commons-logging组件(围绕commons-logging库创建一个包装库,并依赖Commons Logging Integration库)。
也不解决问题。
我注意到,与其他包裹库出现相同的问题;如果他们自己有外部依赖关系,那么ClassNotFoundExceptions就像疯了一样传播,即使我已经包装了他们需要的库的罐子并将它们作为依赖关系添加到原始包装库模块。
形象地:
alt text http://files.droplr.com/files/18876491/IwG2.NetBeans%20Project%20problem.png
我在我的智慧在这里结束。我注意到,类似的问题,而谷歌搜索:
Is there a known bug on NB Module dependency
Same issue I'm facing but when wrapping a different jar
NetBeans stance on this - none of the 3 apply to me.
无确凿地帮助我。
谢谢
尼克
编辑:我设法与BeanUtils的例子通过添加依赖于共享记录和commons-收藏到的BeanUtils库包装进行编译。但我的问题仍然存在于其他情况下。
在NetBeans平台,你不只是包括原料罐;你需要创建一个包装jar的模块。 – I82Much 2010-03-29 18:37:53