'Like' Feature is Not Working Due to "Like Failed" Error

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Symptoms

Like  feature in Confluence is not working due to Like Failed error. The following appears in the atlassian-confluence.log:

2012-10-14 23:23:07,824 ERROR [http-8080-7] [atlassian.event.internal.EventPublisherImpl] invokeListeners There was an exception thrown trying to dispatch event 'com.atlassian.confluence.event.events.like.LikeCreatedEvent@16e78c0b[user=EmbeddedCrowdUser{name='admin', displayName='AdminInternal', directoryId=00000001},content=page: This is a Test Page v.1 (30895848),timestamp=1350235387622]' from the invoker 'com.atlassian.event.internal.SingleParameterMethodListenerInvoker@2aa78480'.
 -- url: /rest/likes/1.0/content/40697858/likes | userName: admin | referer: http://<Server Base URL>/pages/viewpage.action?pageId=30895848
java.lang.RuntimeException: Invalid recipient: null
	at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:54)
	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$2.run(AsynchronousAbleEventDispatcher.java:60)
	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1.execute(AsynchronousAbleEventDispatcher.java:28)
	at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:56)
	at com.atlassian.event.internal.EventPublisherImpl.invokeListeners(EventPublisherImpl.java:151)
	at com.atlassian.event.internal.EventPublisherImpl.publish(EventPublisherImpl.java:70)
	at com.atlassian.confluence.like.DefaultLikeManager.addLike(DefaultLikeManager.java:50)
.....
Caused by: java.lang.IllegalArgumentException: Invalid recipient: null
	at com.atlassian.confluence.plugins.like.notifications.LikeNotification.<init>(LikeNotification.java:29)
	at com.atlassian.confluence.plugins.like.notifications.DefaultLikeNotificationManager.getNotifications(DefaultLikeNotificationManager.java:70)
	at com.atlassian.confluence.plugins.like.notifications.NotificationListener.innerOnLikeEvent(NotificationListener.java:155)
	at com.atlassian.confluence.plugins.like.notifications.NotificationListener.access$100(NotificationListener.java:58)
	at com.atlassian.confluence.plugins.like.notifications.NotificationListener$1.doInTransaction(NotificationListener.java:104)

(info) Note the Invalid recipient: null root cause in the stacktrace.

Cause

A follower of the user that is trying to Like  a content is no longer available due to  CONF-15614 - Getting issue details... STATUS .

Resolution

The following steps will delete all follower and followee entries that are no longer exist in cwd_user table

  1. Shutdown Confluence
  2. Create a backup of Confluence database for safety precaution

  3. Only if you are on Confluence 5.1.x or earlier:
    Execute the following SQL queries

    DELETE FROM FOLLOW_CONNECTIONS
WHERE LOWER(FOLLOWER) NOT IN (SELECT lower_user_name FROM cwd_user);
 
DELETE FROM FOLLOW_CONNECTIONS
WHERE LOWER(FOLLOWEE) NOT IN (SELECT lower_user_name FROM cwd_user);

    Only if you are on Confluence 5.2.x or later:
    Execute the following SQL queries

    DELETE FROM FOLLOW_CONNECTIONS
WHERE FOLLOWER NOT IN
	(SELECT user_key FROM user_mapping WHERE LOWER(username) IN (SELECT lower_user_name FROM cwd_user));
 
DELETE FROM FOLLOW_CONNECTIONS
WHERE FOLLOWEE NOT IN
	(SELECT user_key FROM user_mapping WHERE LOWER(username) IN (SELECT lower_user_name FROM cwd_user));
  4. Restart Confluence
Last modified on Nov 2, 2018

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