Github user oza commented on a diff in the pull request: https://github.com/apache/hadoop/pull/76#discussion_r52916706 --- Diff: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/test/java/org/apache/hadoop/mapreduce/v2/hs/webapp/TestHsWebServicesJobsQuery.java --- @@ -136,7 +130,8 @@ public void testJobsQueryStateNone() throws JSONException, Exception { assertEquals(MediaType.APPLICATION_JSON_TYPE, response.getType()); JSONObject json = response.getEntity(JSONObject.class); assertEquals("incorrect number of elements", 1, json.length()); - assertEquals("jobs is not null", JSONObject.NULL, json.get("jobs")); + assertEquals("jobs is not empty", --- End diff -- I found one incompatible change about Jersey - after upgrading from 1.12 to 1.13, the root element whose content is empty collection is changed from null to empty object({}). Related to following change: https://java.net/jira/browse/JERSEY-1168 This change of lines fixes tests and assertions about JSONObject.NULL to address the change above.
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