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https://issues.apache.org/jira/browse/PIVOT-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13808323#comment-13808323
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Roger Whitcomb commented on PIVOT-927:
--------------------------------------
Actually the code in "tags/2.0.2" seems to line up reasonably well with your
stack trace. And it seems likely that an NPE could occur if the result of
"mouseCapturer.mapPointFromAncestor(...)" returned null (which it can do if the
"mouseCapturer" component is not a child of the current "display").
One solution would be to change the code in ApplicationContext to check for a
null Location, but I think it would be good (if possible) to identify in your
application how the mouse capturer component is being set and make sure of what
it is set to. Do you have multiple windows open (by any chance)? Or does this
happen in conjunction with a popup menu, perhaps?
> Unexpected NPE
> --------------
>
> Key: PIVOT-927
> URL: https://issues.apache.org/jira/browse/PIVOT-927
> Project: Pivot
> Issue Type: Question
> Affects Versions: 2.0.3
> Reporter: Łukasz Hanusiak
>
> 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?
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