Private Messaging - Message is never sent out

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.X CE, 2.1.X EE
• Fix Version/s: 2.1.X CE, 2.1.X EE, 3.0 EE GA1, 3.0 CE GA1
• Component/s: Social Office Dashboard, Social Office Dashboard > Messages
• Labels:
  • SO_6.2
• Environment: Tomcat 7.0 + MySQL 5. Portal master GIT ID: 8a4a2576f73a40a1c0dce8e6b8e70db7c1c6735e.; Plugins master GIT ID: 1d9c81eb59c6608e413aa1c0c43cd5c3788564a2.
• Fix Priority: 5
• Affects Portal Version/s:
  6.2.x
• Portal Fix Version/s:
  6.2.x

1. Deploy Private-messaging-portlet
2. Add Private messaging portlet to User's Dashboard/my public pages
3. Click New Message
4. Fill in fields, and Send

Expected results:
The message can be sent successfully

Actual results:
The [Sending message...] never completes and stays forever.