Like Button not Working after Upgrade

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After upgrading Confluence, upon attempting to like or unlike a page an email notification is sent as expected, but the page is not updated accordingly.

The following appears in the atlassian-confluence.log:

ERROR [tomcat-http--22] [atlassian.event.internal.EventPublisherImpl] invokeListeners There was an exception thrown trying to dispatch event '[user=EmbeddedCrowdUser{name='xxx', displayName='xxx xxx', directoryId=1179649},content=page: content (23396589),timestamp=1350569503769]' from the invoker 'com.atlassian.event.internal.SingleParameterMethodListenerInvoker@35188d90'.
 -- url: /confluence/rest/likes/1.0/content/23396589/likes | userName: xxx | referer: https://confluence_URL/confluence/display/SpaceKey/Page+Name
java.lang.RuntimeException: Invalid recipient: null


The Like plugin broke during the upgrade.


Resolution 1:

Try disabling/enabling the Confluence Like plugin in Confluence Admin > Plugins > Show System Plugins.

Resolution 2:

Last modified on Mar 30, 2016

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