Summary

Questions for Confluence throws error add Topic with Special Characters when creating a new question

Environment

Confluencne 6.6.0
Questions for Confluence 2.5.4

Steps to Reproduce

1. Install Questions for Confluence from Marketplace
2. Go to the Questions tab, try to Ask a new quetion
3. Enter any Question title and the body
4. Under the Topic field, enter a new topic with Special Characters in it
   • For example: d&a
5. Click Save

Expected Results

1. A new question is posted

Actual Results

1. the Oops - an error has occurred is shown with the stack trace of errors:

   java.lang.IllegalArgumentException: Invalid label 'd&a'
   	at com.atlassian.confluence.labels.DefaultLabelManager.validateLabel(DefaultLabelManager.java:720)
   	at com.atlassian.confluence.labels.DefaultLabelManager.addLabel(DefaultLabelManager.java:78)
   	at com.atlassian.confluence.labels.CachingLabelManager.addLabel(CachingLabelManager.java:86)
   	at sun.reflect.GeneratedMethodAccessor1344.invoke(Unknown Source)
   	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   	at java.lang.reflect.Method.invoke(Method.java:498)
   ...
   

   similar error shows in atlassian-confluence.log as well:

   2018-02-01 14:50:53,891 ERROR [http-nio-8090-exec-4] [atlassian.confluence.servlet.ConfluenceServletDispatcher] sendError Could not execute action
    -- referer: http://10.60.3.46:8090/confluence/questions/ask?title= | url: /confluence/cq/doaskquestion.action | traceId: 138fb680f7c41dc1 | userName: admin
   java.lang.IllegalArgumentException: Invalid label 'd&a'
           at com.atlassian.confluence.labels.DefaultLabelManager.validateLabel(DefaultLabelManager.java:720)
           at com.atlassian.confluence.labels.DefaultLabelManager.addLabel(DefaultLabelManager.java:78)
           at com.atlassian.confluence.labels.CachingLabelManager.addLabel(CachingLabelManager.java:86)
           at sun.reflect.GeneratedMethodAccessor1344.invoke(Unknown Source)
           at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   ...
   

Note

This will cause the user to lost all of the details that they have typed in the body field in the previous page.