Issue with Spark job java.lang.NullPointerException at com.linkedin.drelephant.analysis.AnalyticJob.getAnalysis(AnalyticJob.java:303)

Hi,
I am getting null pointer exception without below line but commented in the code; any reason ?

// This was added for AnalyticTest. Commenting this out to fix a bug. Also disabling AnalyticJobTest.
detail.yarnAppHeuristicResultDetails = new ArrayList();

detail.yarnAppHeuristicResultDetails.add(heuristicDetail);

01-06-2018 22:58:07 ERROR [dr-el-executor-thread-2] com.linkedin.drelephant.ElephantRunner : java.lang.NullPointerException
at com.linkedin.drelephant.analysis.AnalyticJob.getAnalysis(AnalyticJob.java:303)
at com.linkedin.drelephant.ElephantRunner$ExecutorJob.run(ElephantRunner.java:177)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Start with AnalyticJob.getAnalysis in AnalyticJob.java at line 303 and inspect the initialization of detail.yarnAppHeuristicResultDetails before the failing add call. Review the AnalyticTest and AnalyticJobTest references in the issue, then reproduce the Spark job failure and confirm the null-pointer error is resolved without regressing those tests.