When a job is residing in a folderJob then the API url to the job in job.allBuilds() points to /job/SIMPLE_JOB_NAME/api/json which causes a 404. Instead the job.allBuilds() should point to /job/FOLDER_JOB_NAME/job/SIMPLE_JOB_NAME/api/json.

Code: JobWithDetails#127

Fix:

private String getJobPath() {
   String[] nameParts = this.getFullName().split("
/");
   for(int i=0;i<nameParts.length;i++)

{       nameParts[i] = EncodingUtils.encode(nameParts[i]);    }

   return "/job/" + String.join("/job/",nameParts);
}

public List<Build> getAllBuilds() throws IOException {
   String path = getJobPath();
   try {

      List<Build> builds = client.get(path + "?tree=allBuilds[number[*],url[*],queueId[*]]", AllBuilds.class).getAllBuilds();

      if (builds == null)

{           return Collections.emptyList();       }

else {
         return transform(builds, new Function<Build, Build>() {
            @Override
            public Build apply(Build from)

{                return buildWithClient(from);            }

        });
      }
   } catch (HttpResponseException e) {
              // TODO: Thinks about a better handling if the job does not exist?
         if (e.getStatusCode() == HttpStatus.SC_NOT_FOUND)

{             // TODO: Check this if this is necessary or a good idea?            return null;         }

        throw e;
   }
}