Sometimes, when i run my application, I have this exception and all
the activities terminate.
This happens when there are many activities at the same time.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at
edu.umd.cs.piccolo.activities.PActivityScheduler.getAnimating(PActivityScheduler.java:
191)
at edu.umd.cs.piccolo.PCanvas.getAnimating(PCanvas.java:353)
at edu.umd.cs.piccolo.PCanvas.paintComponent(PCanvas.java:589)
at javax.swing.JComponent.paint(JComponent.java:1029)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5124)
at javax.swing.RepaintManager
$PaintManager.paintDoubleBuffered(RepaintManager.java:1479)
at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:
1410)
at javax.swing.RepaintManager.paint(RepaintManager.java:1224)
at javax.swing.JComponent._paintImmediately(JComponent.java:5072)
at javax.swing.JComponent.paintImmediately(JComponent.java:4882)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:
785)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:
713)
at
javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:
693)
at javax.swing.SystemEventQueueUtilities
$ComponentWorkRequest.run(SystemEventQueueUtilities.java:125)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
at java.awt.EventQueue.access$000(EventQueue.java:84)
at java.awt.EventQueue$1.run(EventQueue.java:602)
at java.awt.EventQueue$1.run(EventQueue.java:600)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext
$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:
269)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:
184)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:
174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:
169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:
161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at
edu.umd.cs.piccolo.activities.PActivityScheduler.processActivities(PActivityScheduler.java:
175)
at edu.umd.cs.piccolo.PRoot.processInputs(PRoot.java:332)
at edu.umd.cs.piccolo.activities.PActivityScheduler
$1.actionPerformed(PActivityScheduler.java:222)
at javax.swing.Timer.fireActionPerformed(Timer.java:291)
at javax.swing.Timer$DoPostEvent.run(Timer.java:221)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
at java.awt.EventQueue.access$000(EventQueue.java:84)
at java.awt.EventQueue$1.run(EventQueue.java:602)
at java.awt.EventQueue$1.run(EventQueue.java:600)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext
$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:
269)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:
184)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:
174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:
169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:
161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
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