[jira] [Created] (MAPREDUCE-7251) Present friendlier error for non-static main

["Connor Taffe (Jira)" <ji...@apache.org>]

Connor Taffe created MAPREDUCE-7251:
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             Summary: Present friendlier error for non-static main
                 Key: MAPREDUCE-7251
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7251
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
    Affects Versions: 2.9.2
            Reporter: Connor Taffe


When running a jar with hadoop jar, e.g. when submitting using gcloud dataproc jobs submit hadoop, a JAR with a non-static main gives a cryptic error message that could be clearer. The current error message in Hadoop 2.9.2 looks like:
{code:java}
Exception in thread "main" java.lang.NullPointerException
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at org.apache.hadoop.util.RunJar.run(RunJar.java:244)
  at org.apache.hadoop.util.RunJar.main(RunJar.java:158)
  at com.google.cloud.hadoop.services.agent.job.shim.HadoopRunJarShim.main(HadoopRunJarShim.java:12)
{code}
Instead, it would be more helpful to show an error message like "Method main must be static: foo.bar.BazMR".



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