[PIVOT-927] Unexpected NPE

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.3
• Fix Version/s: 2.0.4, 2.1
• Assignee: Roger Lee Whitcomb
• Reporter: Łukasz Hanusiak
• Created: 29/Oct/13 18:47
• Updated: 29/Apr/14 07:37
• Resolved: 29/Apr/14 07:37

Description

After upgrading to pivot 2.0.3 my application randomly becomes unresponsive after throwing NPE with following trace:
java.lang.NullPointerException
at org.apache.pivot.wtk.ApplicationContext$DisplayHost.processMouseMotionEvent(ApplicationContext.java:1132)
at java.awt.Component.processEvent(Unknown Source)
at org.apache.pivot.wtk.ApplicationContext$DisplayHost.processEvent(ApplicationContext.java:793)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$400(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

After mentioned exception occurs user is unable to use any element of UI. Only application restart helps solve this problem. Even more confusing is fact that problem sometimes occurs after few minutes and sometimes after few hours or even days.

Can anybody give me some pointers how to workaround / fix this situation?

Issue Links

• is related to: PIVOT-938 Method getMouseLocation returns null