java.lang.NullPointerException
   at fi.helsinki.cs.tmc.model.ProjectMediator.tryGetExerciseForProject(ProjectMediator.java:126)
   at fi.helsinki.cs.tmc.spyware.eventsources.WindowStatechangesEventSource.getExercise(WindowStatechangesEventSource.java:153)
   at fi.helsinki.cs.tmc.spyware.eventsources.WindowStatechangesEventSource.propertyChange(WindowStatechangesEventSource.java:65)
   at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:341)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
   at org.netbeans.api.editor.EditorRegistry.fireEvents(EditorRegistry.java:544)
   at org.netbeans.api.editor.EditorRegistry.focusLost(EditorRegistry.java:373)
   at org.netbeans.api.editor.EditorRegistry$FocusL.focusLost(EditorRegistry.java:681)
   at java.awt.AWTEventMulticaster.focusLost(AWTEventMulticaster.java:238)
   at java.awt.AWTEventMulticaster.focusLost(AWTEventMulticaster.java:237)
   at java.awt.AWTEventMulticaster.focusLost(AWTEventMulticaster.java:237)
   at java.awt.AWTEventMulticaster.focusLost(AWTEventMulticaster.java:237)
   at java.awt.Component.processFocusEvent(Component.java:6493)
   at java.awt.Component.processEvent(Component.java:6357)
   at java.awt.Container.processEvent(Container.java:2259)
   at java.awt.Component.dispatchEventImpl(Component.java:4985)
   at java.awt.Container.dispatchEventImpl(Container.java:2317)
   at java.awt.Component.dispatchEvent(Component.java:4817)
   at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1944)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:995)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:661)
   at java.awt.Component.dispatchEventImpl(Component.java:4866)
   at java.awt.Container.dispatchEventImpl(Container.java:2317)
   at java.awt.Component.dispatchEvent(Component.java:4817)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:761)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:712)
   at java.awt.EventQueue$3.run(EventQueue.java:706)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:77)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
   at java.awt.EventQueue$4.run(EventQueue.java:734)
   at java.awt.EventQueue$4.run(EventQueue.java:732)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:77)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:731)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.SentEvent.dispatch(SentEvent.java:70)
   at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(DefaultKeyboardFocusManager.java:217)
   at java.awt.DefaultKeyboardFocusManager.sendMessage(DefaultKeyboardFocusManager.java:244)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:731)
   at java.awt.Component.dispatchEventImpl(Component.java:4866)
   at java.awt.Container.dispatchEventImpl(Container.java:2317)
   at java.awt.Window.dispatchEventImpl(Window.java:2759)
   at java.awt.Component.dispatchEvent(Component.java:4817)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:761)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:712)
   at java.awt.EventQueue$3.run(EventQueue.java:706)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:77)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
   at java.awt.EventQueue$4.run(EventQueue.java:734)
   at java.awt.EventQueue$4.run(EventQueue.java:732)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:77)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:731)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.SequencedEvent.dispatch(SequencedEvent.java:128)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:759)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:712)
   at java.awt.EventQueue$3.run(EventQueue.java:706)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:77)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
   at java.awt.EventQueue$4.run(EventQueue.java:734)
   at java.awt.EventQueue$4.run(EventQueue.java:732)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:77)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:731)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:192)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:117)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:106)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:102)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:94)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:83)