Jason Howk created JENKINS-13336:
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             Summary: Invalid JSON is produced during remote api operations 
when a changeSet contains duplicate keys.
                 Key: JENKINS-13336
                 URL: https://issues.jenkins-ci.org/browse/JENKINS-13336
             Project: Jenkins
          Issue Type: Bug
          Components: core
    Affects Versions: current
         Environment: Jenkins Version 1.458 on Linux (centos). Also appears in 
1.457
            Reporter: Jason Howk
            Priority: Critical


Use this URL as a working example:  
http://ci.jenkins-ci.org/view/Jenkins%20core/job/jenkins_main_trunk/1637/api/json

When looking at a specific build for a given job, the JSON produced for the 
Remote API functionality is invalid when the changeSet is not null.  Using the 
example above, the JSON returned from this api call results in the changeSet 
object containing two author and msg objects.  These duplicate keys are causing 
errors with external parsers that are downloading data using the api.

Steps to reproduce:
1.) Using the URL above, attempt to validate the JSON using JSLint 
(www.jslint.com)
2.) You will receive a duplicate 'author' and 'msg' error.
3.) Using a build that does not have a changeSet does not contain the 
duplicates and therefore produces valid JSON.

https://builds.apache.org/job/ActiveMQ/918/api/json can also be used (Jenkins 
1.457) to verify.  A duplicate changeSet/items/msg will be found.

Expected result:
1.) Data should validate properly (and therefore parse.)


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