Problem

• You cannot delete an existing application link

• You receive the following REST error in the user interface in Confluence:
  
  
  And/or the following is seen in the atlassian-confluence.log:

  2013-05-26 14:30:59,027 ERROR [http-443-1] [common.error.jersey.ThrowableExceptionMapper] toResponse Uncaught exception thrown by REST service
   -- url: /rest/applinks/2.0/permission/reciprocate-application-delete/86c7afb6-875b-31da-b02f-200f44181f97 | userName: UserName | referer: http://MyConfluence.com/admin/listapplicationlinks.action
  java.lang.NullPointerException: currentApplication

Causes

1. Confluence cannot reach the external application that the link is for.
2. The information for the application link has somehow been removed from the external application, but not from Confluence.

Resolution

Cause one

• Ensure Confluence can contact the external application and that it is operational

Cause two

• Shutdown Confluence

• Run the following SQL command to clean out all of the application links in Confluence:

  This SQL command will delete all application links established in Confluence. If there are other existing links, delete all that can be before running this command and remember to recreate them after running the command.

  DELETE FROM BANDANA WHERE BANDANAKEY like 'applinks.admin%';
  DELETE FROM BANDANA WHERE BANDANAKEY = 'applinks.global.application.ids';

• Start Confluence
• Recreate any application links that are needed