java.lang.NullPointerException: The dir parameter cannot be null
        at org.openide.util.Parameters.notNull(Parameters.java:86)
        at org.apache.tools.ant.module.api.support.ActionUtils.antIncludesList(ActionUtils.java:250)
        at org.apache.tools.ant.module.api.support.ActionUtils.antIncludesList(ActionUtils.java:232)
        at org.netbeans.modules.java.j2seproject.J2SEActionProvider.setupTestSingle(J2SEActionProvider.java:821)
        at org.netbeans.modules.java.j2seproject.J2SEActionProvider.getTargetNames(J2SEActionProvider.java:677)
        at org.netbeans.modules.java.j2seproject.J2SEActionProvider$4.run(J2SEActionProvider.java:378)
        at org.netbeans.api.java.source.ui.ScanDialog.runWhenScanFinished(ScanDialog.java:150)
        at org.netbeans.modules.java.j2seproject.J2SEActionProvider.invokeAction(J2SEActionProvider.java:482)
        at org.netbeans.modules.groovy.support.LookupMergerSupport$MergedActionProvider.invokeAction(LookupMergerSupport.java:111)
        at org.netbeans.modules.project.ui.actions.FileCommandAction.actionPerformed(FileCommandAction.java:96)
        at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.actionPerformed(LookupSensitiveAction.java:166)
        at org.openide.windows.TopComponent.processKeyBinding(TopComponent.java:1052)
        at javax.swing.JComponent.processKeyBindings(JComponent.java:2895)
        at javax.swing.JComponent.processKeyEvent(JComponent.java:2812)
        at java.awt.Component.processEvent(Component.java:5903)
        at java.awt.Container.processEvent(Container.java:2102)
        at java.awt.Component.dispatchEventImpl(Component.java:4497)
        at java.awt.Container.dispatchEventImpl(Container.java:2160)
        at java.awt.Component.dispatchEvent(Component.java:4327)
        at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1848)
        at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:697)
        at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:962)
        at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:834)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
        at java.awt.Component.dispatchEventImpl(Component.java:4369)
        at java.awt.Container.dispatchEventImpl(Container.java:2160)
        at java.awt.Window.dispatchEventImpl(Window.java:2440)
        at java.awt.Component.dispatchEvent(Component.java:4327)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:300)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:210)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:200)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:195)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:187)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)