HashCode key colission in NotificationEvent

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.1.1 CE GA2, 6.1.20 EE GA2
• Fix Version/s: 6.1.30 EE GA3
• Component/s: User Notifications, ~ [Archived] Collaboration
• Labels:
  • QA-R
• Branch Version/s:
  6.1.x
• Backported to Branch:
  Committed
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/6344

HashCode is 0 for non-persisted NotificationEvents. This causes the notification framework to allow only 1 non-persisted notification event in the queue at a time.