I HAve an error when I am traying to connect to DB (Hibernate 
properties) , I can't generate the DB schema nor Hibernate descriptor.
 
the first messages is this :
A java.lang.NullPointerException exception has occurred.
Please report this at http://www.netbeans.org/community/issues.html,
including a copy of your messages.log file as an attachment.
The messages.log file is located in your 
C:\Users\Proprio\.netbeans\5.5.1\var\log folder.

it is the detailed messages:
java.lang.NullPointerException
	at sf.netbeans.prjextensions.BuildScript.getProperties
(BuildScript.java:427)
	at sf.netbeans.prjextensions.BuildScript.writeProperties
(BuildScript.java:337)
	at sf.netbeans.prjextensions.BuildScript.update
(BuildScript.java:258)
	at 
sf.netbeans.prjextensions.FeatureCustomizerDialog.customize
(FeatureCustomizerDialog.java:112)
	at 
sf.netbeans.prjextensions.Feature$PropertiesAction.performAction
(Feature.java:283)
	at org.openide.util.actions.NodeAction$DelegateAction$1.run
(NodeAction.java:537)
	at 
org.netbeans.modules.openide.util.ActionsBridge.doPerformAction
(ActionsBridge.java:53)
	at 
org.openide.util.actions.NodeAction$DelegateAction.actionPerformed
(NodeAction.java:533)
	at javax.swing.AbstractButton.fireActionPerformed
(AbstractButton.java:1995)
	at javax.swing.AbstractButton$Handler.actionPerformed
(AbstractButton.java:2318)
	at javax.swing.DefaultButtonModel.fireActionPerformed
(DefaultButtonModel.java:387)
	at javax.swing.DefaultButtonModel.setPressed
(DefaultButtonModel.java:242)
	at javax.swing.AbstractButton.doClick
(AbstractButton.java:357)
	at javax.swing.plaf.basic.BasicMenuItemUI.doClick
(BasicMenuItemUI.java:1216)
	at 
javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased
(BasicMenuItemUI.java:1257)
	at java.awt.Component.processMouseEvent(Component.java:6038)
	at javax.swing.JComponent.processMouseEvent
(JComponent.java:3260)
	at java.awt.Component.processEvent(Component.java:5803)
	at java.awt.Container.processEvent(Container.java:2058)
	at java.awt.Component.dispatchEventImpl(Component.java:4410)
	at java.awt.Container.dispatchEventImpl(Container.java:2116)
	at java.awt.Component.dispatchEvent(Component.java:4240)
	at java.awt.LightweightDispatcher.retargetMouseEvent
(Container.java:4322)
	at java.awt.LightweightDispatcher.processMouseEvent
(Container.java:3986)
	at java.awt.LightweightDispatcher.dispatchEvent
(Container.java:3916)
	at java.awt.Container.dispatchEventImpl(Container.java:2102)
	at java.awt.Window.dispatchEventImpl(Window.java:2429)
	at java.awt.Component.dispatchEvent(Component.java:4240)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
	at java.awt.EventDispatchThread.pumpOneEventForFilters
(EventDispatchThread.java:273)
	at java.awt.EventDispatchThread.pumpEventsForFilter
(EventDispatchThread.java:183)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy
(EventDispatchThread.java:173)
	at java.awt.EventDispatchThread.pumpEvents
(EventDispatchThread.java:168)
	at java.awt.EventDispatchThread.pumpEvents
(EventDispatchThread.java:160)
	at java.awt.EventDispatchThread.run
(EventDispatchThread.java:121)