Netbeans platform projects - problems with wrapped jar files that have dependencies
- by I82Much
For starters, this question is not so much about programming in the NetBeans IDE as developing a NetBeans project (e.g. using the NetBeans Platform framework).
I am attempting to use the BeanUtils library to introspect my domain models and provide the properties to display in a property sheet. Sample code:
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;
}
I have created a wrapper module around commons-beanutils-1.8.3.jar, and added a dependency on the module in my module containing the above code. Everything compiles fine. When I attempt to run the program and open the property sheet view (i.e.. the above code actually gets run), I get the following error:
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 ModuleCL@64e48e45[org.apache.commons.beanutils] with possible defining loaders [ModuleCL@75da931b[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)
I understand that beanutils is using the commons-logging component. I have tried adding the commons-logging component in two different ways (creating a wrapper library around the commons-logging library, and putting a dependency on the Commons Logging Integration library).
Neither solves the problem.
I noticed that the same problem occurs with other wrapped libraries; if they themselves have external dependencies, the ClassNotFoundExceptions propagate like mad, even if I've wrapped the jars of the libraries they require and added them as dependencies to the original wrapped library module.
Pictorially:
I'm at my wits end here. I noticed similar problems while googling:
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.
None conclusively help me.
Thank you,
Nick
