[PIVOT-938] Method getMouseLocation returns null

• 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: 17/Mar/14 06:29
• Updated: 04/Apr/14 15:04
• Resolved: 04/Apr/14 15:04

Description

Recently my application crashed with following stack trace:

ERROR 2014-03-08 18:42:26,265 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - java.lang.NullPointerException
ERROR 2014-03-08 18:42:26,265 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at org.apache.pivot.wtk.Component$1.run(Component.java:2771)
ERROR 2014-03-08 18:42:26,265 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at org.apache.pivot.wtk.ApplicationContext$QueuedCallback.run(ApplicationContext.java:1607)
ERROR 2014-03-08 18:42:26,265 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.event.InvocationEvent.dispatch(Unknown Source)
ERROR 2014-03-08 18:42:26,265 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
ERROR 2014-03-08 18:42:26,265 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventQueue.access$200(Unknown Source)
ERROR 2014-03-08 18:42:26,265 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventQueue$3.run(Unknown Source)
ERROR 2014-03-08 18:42:26,265 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventQueue$3.run(Unknown Source)
ERROR 2014-03-08 18:42:26,265 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.security.AccessController.doPrivileged(Native Method)
ERROR 2014-03-08 18:42:26,265 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
ERROR 2014-03-08 18:42:26,281 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventQueue.dispatchEvent(Unknown Source)
ERROR 2014-03-08 18:42:26,281 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
ERROR 2014-03-08 18:42:26,281 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
ERROR 2014-03-08 18:42:26,281 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
ERROR 2014-03-08 18:42:26,281 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
ERROR 2014-03-08 18:42:26,281 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
ERROR 2014-03-08 18:42:26,281 AWT-EventQueue-0 pl.com.stam.bs3lsm.BarrelS3App - at java.awt.EventDispatchThread.run(Unknown Source)

I traced error to following piece of code:

triggerTooltipCallback = ApplicationContext.scheduleCallback(new Runnable() {
@Override
public void run()

{ Point mouseLocationLocal = getMouseLocation(); componentTooltipListeners.tooltipTriggered(Component.this, mouseLocationLocal.x, mouseLocationLocal.y); }

}, tooltipDelay);

It seem like value returned from getMouseLocation() is null for some reason. Unfortunately I am not able to reproduce this error. Do you have any ideas how to avoid such problems in future?

Issue Links

• relates to: PIVOT-927 Unexpected NPE